Use Relay if you want the clearest, audit-ready way to assign and report separate accounts for client retainers and operating funds—it supports many individual checking accounts and strong automated reporting. If you want to earn interest on retained balances, consider Bluevine’s sub-account + APY options as an alternative; Mercury is a top pick for firms that prioritize API-driven automation.
1RelayBest when you need audit-friendly, organized separation: Relay supports up to 20 individual checking accounts, offers automated reporting and integrations for clear retainer vs operating tracking; consider a traditional bank for large cash balances.56%
2BluevineBest when you want labeled sub-accounts plus interest: Bluevine offers dedicated sub-account numbers and higher APY on balances (Premier expands sub-account limits), but sub-account counts vary by plan—check plan limits before committing.54%
3MercuryBest for tech-forward or high-volume firms that want API-first automation and custom reporting; Mercury enables programmatic integrations for automated bookkeeping though you’ll rely on APIs rather than a full native trust-account workflow.53%
Relay Financial provides the most robust platform for a consulting firm seeking to separate client retainers and operating funds via an online-first banking experience.
While traditional business banks limit you to one or two checking accounts, Relay allows businesses to open up to 20 individual checking accounts (and up to 50 on higher tiers) with $0 monthly fees and no minimum balances . This structural capability lets consultants assign a distinct, fully-accountable checking account or sub-ledger equivalent to each major client retainer, keeping unearned retainers physically separated from day-to-day operating cash.
Top Online Banking Options for Retainer Management
For a consulting firm, I’d distinguish cash segregation from reporting/accounting depth. The strongest options I found are Mercury, Relay, and , with somewhat different strengths.
Online financial platforms like Financial and Mercury provide the most robust account-partitioning and reporting features for separating client retainers from operating funds without requiring separate traditional banking relationships.
For a consulting firm, cleanly segregating client retainers (unearned revenue/liability) from operating funds (discretionary revenue) is critical for both cash-flow visibility and liability management. Traditional commercial banks often make you pay per sub-account or deal with cumbersome multi-login setups, but modern online banking platforms and fintech-backed business accounts handle this smoothly via virtual sub-checking accounts and robust ledger reporting.
True Segregation: Moving retainer funds into a separate, numbered checking account ensures absolute legal and operational transparency compared to "virtual envelope" tools that group all money in one pool under the hood.
Granular Reporting & Exporting: Relay lets you pull discrete CSV statements and reports for a single client account rather than filtering through a massive, commingled operating ledger.
Automated Rules: You can route incoming ACH wires or client payments directly into designated sub-checking accounts using automated rules based on transaction criteria.
If you'd like, let me know:
How many active client retainers you typically manage at once
Whether you require integrations with QuickBooks, Xero, or specific CRM/invoicing tools
I can narrow down whether a multi-checking platform like Relay or a tightly integrated platform like Novo fits your workflow better.
Firms with a controller/CFO or sophisticated bookkeeping
Relay
Excellent — up to 20 checking accounts, with higher limits on Scale
Very good — QBO/Xero, detailed transaction data, exports
Firms wanting each retainer/project in a distinct account
Bluevine
Excellent — sub-accounts with separate account numbers/statements
Good — strong account visibility, accountant dashboard
Firms prioritizing simple segregation and potentially earning interest
Novo
Good — reserves/envelopes
More basic
Smaller consulting practices
1. Mercury — strongest reporting layer
Mercury is particularly compelling if by “reporting” you mean giving your bookkeeper/controller clean data that can flow into the GL.
It supports QuickBooks Online, Xero and NetSuite, with transaction categorization, GL codes, receipts/attachments, and automated syncing. It also allows filtered CSV/XLSX exports and bulk statement exports.
You can also create multiple accounts for purposes such as operating expenses, taxes and payroll and automate transfers between them.
The major advantage is that the banking data can become a fairly sophisticated part of your accounting workflow rather than simply a collection of buckets.
2. Relay — strongest for physical separation
Relay may be the better fit if your primary requirement is “show me exactly which cash belongs to which purpose/client.”
Relay currently supports up to 20 checking accounts on its standard plans, with higher limits on Scale, and lets you name and manage the accounts independently.
For example:
Client A Retainer
Client B Retainer
Client C Retainer
Operating
Payroll
Taxes
Contractor Payments
It also integrates directly with QuickBooks Online and Xero and supports statement exports to accounting systems via CSV/OFX.
That account-level structure can make reconciliation and demonstrating segregation of client funds considerably easier.
3. Bluevine — strong if retainers also generate idle cash
Bluevine's sub-accounts are attractive because each has its own account number, and statements can be viewed separately. Current plan limits range from 5 to 50 sub-accounts depending on the checking plan.
That makes something like:
Main operating → Client retainers → Client-specific sub-accounts
fairly straightforward.
Bluevine also has an Accountant Dashboard that lets accountants access multiple client accounts through one login, which is useful if your firm works with an outside accounting team.
My practical recommendation
If I were designing the banking architecture for a consulting firm, I'd evaluate them in this order depending on what you mean by “reporting”:
Most sophisticated accounting/reporting:Mercury
Best account-by-account retainer segregation:Relay
Best segregation + interest-bearing cash:Bluevine
Simplest small-practice setup:Novo
One important accounting distinction: don't use the bank account alone as the record of whether a retainer has been earned. If a client pays $50,000 upfront, the bank should show where the $50,000 sits, but your accounting system may need to record it as deferred/unearned revenue and recognize revenue as services are delivered under the engagement terms.
For a consulting firm handling multiple client retainers, I'd lean toward Relay if account-level segregation is the priority, or Mercury if the bigger objective is controller-grade reporting and accounting automation.
If you tell me roughly how many active retainers you manage, whether you're using QuickBooks/Xero, and whether clients' funds are legally required to be segregated, I can narrow this to a specific banking/account structure.
For a consulting firm, I would prioritize account-level separation, exportable transaction detail, accounting integrations, and audit trail quality over simply having “folders” or “buckets.” A retainer is often recorded as cash received but not yet earned (deferred revenue/unearned revenue), so the bank should support clean segregation while your accounting system remains the source of truth for revenue recognition.
Very good — multiple accounts and structured workflows
Excellent transaction search, permissions, integrations, API capabilities
Bluevine
Firms wanting separation plus interest on cash
Good — subaccounts for organizing funds
Good dashboards, statements, and cash visibility
Novo
Solo consultants and small practices
Adequate — reserves/buckets
Simpler reporting and bookkeeping integrations
Parse## 1. Relay — strongest fit for retainer segregation
Relay is the closest match to a consulting firm’s operational reality because you can structure the bank like your internal ledger:
Client Retainer — Client A
Client Retainer — Client B
Operating
Payroll
Taxes
Contractor Payments
The advantage is that separation happens at the banking level rather than relying only on transaction labels later. This creates a cleaner month-end reconciliation trail. Relay is especially attractive if you have several active retainers and want your accountant to immediately see which cash belongs where.
2. Mercury — strongest reporting and finance workflow
Mercury is a better fit if your firm is moving toward a controller/CFO-style operation.
Strengths:
Detailed transaction filtering and exports
Strong accounting integrations
Team permissions
Automation/API options
Better fit for firms with higher transaction volume or more complex workflows
The tradeoff: it is more of a financial operations platform than a pure “one bucket per client” system.
3. Bluevine — good if retainers sit for a while
If you often collect retainers months before work is performed, earning interest on idle balances may matter. Bluevine’s account organization features can help separate funds while keeping cash visible.
4. Novo — good for simpler consulting practices
Novo works well for a solo consultant or small firm that mainly needs:
Operating account separation
Basic reserves
Bookkeeping integrations
It is less suited to a firm tracking many client-specific retainers.
A practical setup I would use
For most consulting firms:
Bank structure
Operating Checking
Client Retainers — pooled (or individual accounts for major clients)
Growing consultancy with finance staff: Mercury + QuickBooks/Xero/NetSuite
Consultancy holding significant prepaid balances: Relay or Bluevine, depending on whether yield matters
Solo consultant: Novo or another simple business account
One caveat: if the money you call “client retainers” is legally client-owned funds rather than advance payment for your services, the required structure may differ (for example, some regulated professions have trust-account rules). For ordinary consulting retainers, the main goal is usually clean separation and accurate deferred-revenue accounting.
If you share your approximate number of active retainers and whether you use QuickBooks, Xero, or another accounting system, I can narrow this to a specific banking architecture.
For consulting firms managing multiple client advances or retainers alongside daily operating expenses, traditional brick-and-mortar banks often charge heavy fees or limit the number of sub-accounts. Modern fintech-driven business banking platforms solve this by offering multiple distinct checking accounts or automated allocation buckets under a single master dashboard.
Top Online Banking Options for Retainer Separation
Platform
Core Separation Mechanism
Max Accounts / Sub-accounts
Reporting & Reconciliation Strengths
Relay Financial
Individual, fully-functional checking/savings accounts with unique account numbers
Up to 20 individual checking accounts (free tiers vary)
Direct native integrations with QuickBooks Online and Xero; clean transaction-level audit trails per account.
Advanced cash-flow visualization, granular user permissions, and robust API/CSV export capabilities for custom reporting.
Bluevine
Sub-accounts and separate checking setup
Scaled multi-account options with high-yield checking focus
Good general cash-flow management and interest-earning operating funds, though less specialized for deep multi-client tracking than Relay.
Key Architectural Approaches to Look For
Distinct Account Numbers vs. Virtual Buckets: Choose a platform like Relay that allows distinct checking accounts with unique account numbers rather than just "virtual envelopes." Unique account numbers allow direct ACH or wire deposits from specific clients straight into their designated retainer bucket.
Granular Accounting Sync: Ensure the bank feeds into your accounting software (such as QuickBooks or Xero) cleanly, mapping each sub-account to a specific liability ledger (e.g., Client Retainers Held in Trust ) versus your operating revenue.
Permissions and Visibility: If clients or internal project managers need proof of segregation, look for platforms that let you easily generate standalone statements for individual sub-accounts without exposing main operating ledger data.
To help narrow this down, are you looking to integrate directly with an accounting platform like QuickBooks/Xero , or do you need earn high-yield interest on the unspent retainers?
For a consulting firm, the strongest options are usually the platforms that provide true account separation, transaction-level exports, accounting integrations, and audit trails—not just “budget buckets.” If client retainers represent prepaid services (unearned revenue), I would want the bank structure to make it easy to prove what cash is reserved while your accounting system tracks when revenue is earned.
Top online banking options for separating retainers from operating funds
1. Relay Financial — best overall for retainer segregation
Relay is likely the best fit if your main goal is:
“Client A retainer money should never be confused with operating cash.”
“My accountant should be able to reconcile each bucket quickly.”
“I want the bank structure to mirror my chart of accounts.”
A consulting firm could create:
Client Retainer — Client A
Client Retainer — Client B
Client Retainer — Client C
Operating Expenses
Payroll
Taxes
Partner Distributions
The advantage is that separation happens at the account level rather than only through tags. Relay is designed around multiple business checking accounts and accounting workflows, making it strong for firms with recurring retainers.
Best fit: 5–50 active clients, agencies, professional services firms, firms with monthly reconciliation.
2. Mercury — best reporting and automation stack
Mercury is attractive if your firm operates more like a finance team than a small practice.
Strengths:
Detailed transaction search/filtering
Accounting integrations
Permissions for partners, employees, and accountants
API access for custom reporting workflows
Better fit for NetSuite/Xero/QuickBooks-style environments
A typical structure:
Operating Checking
Client Retainer Accounts
Tax Reserve
Contractor Payments
Payroll
Mercury’s advantage is less “envelope budgeting” and more building a scalable finance system.
Best fit: Growing consultancies, technology consulting firms, firms with a controller/CFO, firms automating reporting.
3. Bluevine — best if retainers sit in cash for a while
Bluevine is worth considering if you routinely hold significant prepaid client balances.
Advantages:
Sub-account organization
Easier cash allocation
Interest-bearing business checking options on eligible balances
The tradeoff: it is excellent for organizing money, but Relay and Mercury are generally stronger if your priority is detailed operational reporting.
Best fit: Consulting firms with large retainers that remain unused for weeks or months.
4. Found — best for smaller consulting firms wanting built-in bookkeeping
Found combines banking features with bookkeeping-oriented tools. Its “Pockets” feature can help separate things like client retainers, subcontractor funds, and taxes.
Best fit: Solo consultants or small firms that want fewer separate systems.
My recommended setup for a consulting firm
Regardless of bank choice, I would structure it like this:
Bank accounts
Client Retainers — Holding
Operating Cash
Payroll
Taxes
Contractor Payments
Accounting system
Client Retainer Liability / Deferred Revenue
Client-by-client tracking
Revenue recognized as services are delivered
The bank separation improves control and reporting, but it does not replace proper revenue recognition.
Ranking by priority
If you want the cleanest audit trail:
Relay
Mercury
Bluevine
Found
If you want the strongest reporting/automation:
Mercury
Relay
Bluevine
Found
If you hold large prepaid retainers and care about yield:
Bluevine
Relay
Mercury
One caveat: if by “client retainers” you mean money that legally belongs to clients (for example, escrow/trust funds) rather than advance payments for your own services, you may need a specialized client-funds or escrow structure rather than a normal business banking setup. Dedicated escrow products can provide more formal sub-account reporting and controls.
For a typical consulting firm receiving prepaid monthly retainers, my default choice would be Relay + QuickBooks Online for operational simplicity, or Mercury + a more advanced accounting stack for a larger firm.
The top online banking choices offering the most robust features for this specific use case include:
1. Relay Financial (Best Overall for Fund Segregation)
Relay is purpose-built for multi-account cash management and is deeply aligned with accounting methodologies like Profit First.
The Setup: You can open up to 20 individual, active checking/savings sub-accounts under a single master profile. Each sub-account can have its own distinct account and routing numbers, meaning you can wire or ACH client retainers directly into a dedicated sub-account.
Reporting Features: It provides granular visibility, allowing you to pull separate balance and transaction reports per sub-account without commingling data. It also integrates natively with QuickBooks Online and Xero , mapping each sub-account to distinct general ledger lines so your bookkeeper can easily track unearned retainer liabilities versus operating income.
Learn More: Check out the features directly on Relay Financial.
2. Brex (Best for Scale and High-Volume Virtual Sub-Accounts)
While technically a financial services platform operating through partner banks rather than a traditional bank itself, Brex offers an enterprise-grade digital stack.
The Setup: For companies needing extreme segmentation, Brex checking allows you to branch out into a massive number of distinct virtual sub-checking accounts (up to over 500). Each possesses unique account numbers, ledgered balances, and individual statements.
Reporting Features: The dashboard enables instant fund movements between sub-accounts, granular permission controls for team members, and clean reporting outputs that cleanly separate project or client-specific capital allocations.
Learn More: Review the platform capabilities on Brex.
3. Mercury (Best for Invoicing and Cash Flow Dashboards)
Mercury is heavily favored by modern service and tech companies for its clean, software-first interface.
The Setup: Mercury lets you easily set up additional checking and savings buckets under your primary profile, though they function slightly differently than Relay’s fully independent account routing numbers.
Reporting Features: Offers exceptional software-driven visibility over cash flow, automated rules for moving money between accounts, and easy-to-export CSV/PDF ledger reports. It also pairs cleanly with external accounting stacks to isolate incoming deposits.
Would you like to compare how these platforms integrate with QuickBooks Online or look into how their fee structures compare for domestic wire and ACH transfers?
For a consulting firm, the best online bank depends on whether you mean internal bookkeeping separation (e.g., “Client A retainer vs. Client B retainer vs. payroll”) or true client-money segregation (where funds legally belong to clients and may require trust/escrow-style handling). Most consulting firms need the first category; regulated firms may need the second.
For retainer tracking + operating fund separation, these are among the strongest options:
Bank/platform
Best for
Reporting & separation strengths
Fit for a consulting firm
Mercury
Accounting-heavy firms
Multiple accounts, transaction categorization, accounting integrations, exports, and workflows designed around separating funds
⭐ Best overall if you want clean books and CPA-friendly reporting
Relay Financial
Many client/project buckets
Multiple checking accounts, account-level visibility, transaction rules, and accounting sync
⭐ Best if you manage many retainers
Bluevine
Simple separation + interest on idle cash
Sub-accounts with separate balances and transaction histories; useful for tax, reserves, projects, and retainers
⭐ Good for smaller firms wanting simplicity
Brex
Larger consulting firms
More finance-platform features: spend controls, reporting, and integrations
Better once you have finance operations beyond basic banking
I would generally avoid putting all retainers into one checking account and trying to sort it out later. A cleaner structure is:
Operating Account
Payroll
Software subscriptions
Rent
General expenses
Client Retainer Accounts
Client A Retainer
Client B Retainer
Client C Retainer
Tax Reserve Account
Profit/Owner Distribution Account
Then connect the bank to accounting software and recognize retainer revenue only as earned. This gives you:
clearer cash availability,
easier client profitability reporting,
cleaner year-end accounting,
less risk of accidentally spending money earmarked for future work.
Ranking by use case
Best overall: Mercury
Strongest if your priority is financial reporting quality. It is designed to work closely with accounting workflows, including categorization and integrations with tools such as QuickBooks, Xero, and NetSuite.
Best for “every client gets a bucket”: Relay
If you have many active retainers, Relay’s account structure is very intuitive because each client or project can have its own visible account.
Best if retainers sit unused for months: Bluevine
If clients prepay large retainers and you want idle cash management, Bluevine’s sub-account approach can help separate funds while keeping balances organized.
Best if you are approaching enterprise scale: Brex
Useful when banking becomes part of a broader finance stack (expense controls, cards, approvals, analytics), rather than just deposit management.
One important caveat: if your “client retainers” are legally client funds held on behalf of clients (rather than advance payments for your own services), you may need a dedicated client-money/trust/escrow structure rather than a normal business banking setup. Specialized client-money accounts exist for that purpose.
If you tell me your firm size (solo/2–10 people/50+), number of active clients, country, and whether retainers are earned immediately or held until work is performed, I can narrow this to the best 2–3 choices.
For consulting firms and professional service agencies, cleanly separating client retainers from operating capital is critical to managing cash flow liabilities and preventing accidental spending of unearned revenue.
When evaluating online business banking platforms and fintech-backed financial tools, the distinction between virtual "buckets/envelopes" (labels inside a single account) and true separate checking accounts (individual account numbers under one dashboard) dictates how robust your reporting will be.
The top online banking platforms optimized for this level of fund segregation and reporting include:
Relay(Best for True Multi-Account Segregation)
How it works: Unlike platforms that use mere virtual sub-folders, Relay allows you to open up to 20 individual, distinct checking accounts and savings accounts under a single login and dashboard.
Retainer & Operating Reporting: Because each retainer can be assigned its own dedicated checking account number, you get clean, standalone monthly statements and real-time transaction tracking for every single client. This makes reconciling unearned retainer revenue against your general ledger in QuickBooks Online or Xero seamless.
Fees & Limits: No monthly maintenance fees or minimum balance requirements, with FDIC insurance up to $3 million via partner banks.
Novo(Best for Simple, Integrated Ledger Management)
How it works: Novo offers Novo Reserves , a feature that lets you partition funds into virtual buckets inside your main checking account.
Retainer & Operating Reporting: While they are virtual allocations rather than standalone bank accounts, Novo’s strength lies in its powerful ecosystem of integrations (such as Stripe, Shopify, and robust bookkeeping syncing). If your retainers flow in via digital invoicing and you prefer a single consolidated bank feed that auto-categorizes via software like QuickBooks Online , Novo keeps the administrative overhead exceptionally low.
Fees & Limits: No monthly fees, no minimums.
Found(Best All-in-One for Solo or Boutique Consultants)
How it works: Found combines business banking with built-in bookkeeping, expense tracking, and tax-saving pockets.
Retainer & Operating Reporting: Found allows you to set aside funds for specific purposes using pockets, and because bookkeeping is native to the app, tracking project-based cash flow and separating tax or client-allocated funds doesn't strictly require an external software stack. It is particularly robust if your consulting firm operates on a lean, sole-proprietor or single-member LLC model.
Fees & Limits: Streamlined tiered pricing with a robust free baseline option.
Key Trade-off: Separate Accounts vs. Virtual Envelopes
Choose Multiple Separate Accounts (e.g., Relay) if you want legal/operational clarity, individual account numbers so clients can wire/ACH to a dedicated spot, and cleanly partitioned monthly bank statements.
Choose Virtual Buckets (e.g., Novo Reserves) if your retainers are managed dynamically inside your accounting software (where liability is tracked on the balance sheet anyway) and you just want a visual separation inside a single primary dashboard.
To help narrow down the ideal platform for your firm, let me know:
Do you need individual account numbers/wiring instructions for each client retainer, or do virtual allocation buckets suffice?
What accounting software (e.g., QuickBooks Online, Xero) does your firm use for reconciliation?
When managing a consulting firm, cleanly separating client retainers (unearned revenue or liability/trust-like funds) from day-to-day operating capital is critical for cash flow visibility and compliance. Traditional legacy banks often force you into clunky, fee-heavy setups for multiple accounts, but modern business-focused online banking platforms (fintechs powered by FDIC-insured partner banks) handle multi-account architecture and reporting much better.
The online banking and financial platforms that provide the most robust reporting and structural separation for retainers versus operating funds include:
Relay (Partner: Thread Bank)
Why it fits: Relay is explicitly built around multi-account financial architecture rather than a single monolithic checking account. It allows you to open up to 20 individual checking accounts , each with its own distinct account number and routing details.
Reporting/Separation approach: You can dedicate specific checking accounts strictly to individual major client retainers or bucket them into "Retainers" vs. "Operating". Because they are distinct checking accounts (not just virtual sub-accounts), your internal dashboard views, transaction exports, and statement generation are natively segregated by account.
Accounting sync: Features direct, granular integration with QuickBooks Online and Xero , ensuring each discrete sub-checking account maps directly to distinct liability or asset lines in your ledger.
Mercury (Partner: Choice Financial Group and Evolve Bank & Trust)
Why it fits: Mercury is designed for modern scaling businesses and professional services, offering robust software-driven cash management.
Reporting/Separation approach: Mercury allows you to open multiple checking and savings accounts, but its strength lies in its search, filtering, and data-enrichment reporting features . You can use custom tagging, robust CSV/Excel exports, and automated rules to trace cash movement. If you use Mercury’s native treasury or savings features, you can easily isolate retainer cash to earn yield without contaminating operating transaction reports.
Accounting sync: Mercury features deep custom mapping for ledger codes, letting you assign GL codes inside the platform before data flows directly into your accounting software, making retainer drawdown reporting much simpler to audit.
Bluevine (Partner: The Bancorp Bank)
Why it fits: Bluevine is an exceptional choice if your operational funds need to actively generate high-yield interest while you manage separate buckets.
Reporting/Separation approach: Bluevine supports multiple sub-accounts and distinct sub-balances, allowing you to partition capital easily. Their reporting interface emphasizes clear categorization of transaction histories per sub-unit, reducing the risk of accidentally dipping into a retainer for operational payroll or software subscriptions.
Comparison Strategy for Consultants
When deciding which platform to deploy for your consultancy:
Choose Relay if your primary goal is strict, legally-delineated account separation where every retainer can live in its own fully-numbered checking account with zero monthly fees.
Choose Mercury if you manage a high volume of transactions and prioritize advanced data filtering, custom GL coding, and clean developer/analyst exports.
To help narrow down the ideal platform, could you share:
How many active client retainers you typically manage at once?
Whether you prefer fully separate account numbers per retainer or virtual sub-accounts under one umbrella?
For a consulting firm, I’d prioritize true account-level segregation + accounting/reporting integrations, rather than simply looking for the bank with the best generic transaction history. You want to be able to say, for example, “Client A Retainer,” “Client B Retainer,” and “Operating Cash,” while keeping the books auditable.
My ranking
Platform
Client-fund separation
Reporting / accounting
Best use
Relay
⭐⭐⭐⭐⭐
⭐⭐⭐⭐⭐
Best overall for multiple client retainers
Mercury
⭐⭐⭐⭐
⭐⭐⭐⭐⭐
Best for sophisticated accounting/reporting
Bluevine
⭐⭐⭐⭐⭐
⭐⭐⭐⭐
Best inexpensive multi-account setup
Brex
⭐⭐⭐
⭐⭐⭐⭐⭐
Best for larger finance teams
Novo
⭐⭐⭐
⭐⭐⭐
Best for simple consulting operations
1. Relay — best fit for your specific use case
relayfi.com is probably my first choice if separating individual client retainers is the primary objective.
Relay lets a business maintain multiple checking accounts under one login—up to 20 on its standard plans and up to 50 on Scale—and accounts can be given names such as “Client A Retainer,” “Client B Retainer,” and “Operating.”
More importantly, Relay emphasizes detailed transaction data, receipts, vendor information, payment memos, and QuickBooks/Xero synchronization.
That makes it particularly attractive if your workflow is:
Client pays retainer → money lands in that client's account → expenses/earned revenue are reconciled → remaining balance is visible → operating funds remain separate.
It also supports automated transfers, so you could establish rules for moving money between accounts.
My pick for: a 2–20 person consultancy with numerous recurring retainers.
2. Mercury — best reporting/accounting layer
mercury.com is the one I'd consider if financial reporting and accounting workflow matter more than having a dedicated bank account for every client.
Mercury has an accounting workflow that lets you review transactions across accounts and filter them by date, payment method, category, GL code, account, receipt, and card.
Its categorization system can also map transactions to GL codes from your accounting system, making it particularly useful for a firm already using an accountant or sophisticated bookkeeping process.
So I'd favor Mercury when you want:
Strong transaction categorization
GL-code integration
Good audit trail
Extensive accounting integrations
Multiple operating/treasury accounts
More sophisticated finance controls
My pick for: a consulting firm where the controller/bookkeeper cares more about the reporting layer than literal one-account-per-client segregation.
3. Bluevine — excellent for inexpensive physical separation
bluevine.com has become particularly interesting for this use case.
Its sub-accounts have their own account numbers, can receive/send ACH, wires and checks, and can have their own debit cards.
As of August 2026, Bluevine offers up to 5 sub-accounts on Standard, 10 on Plus, and 50 on Premier.
You can also pull statements separately for each sub-account.
That makes Bluevine very compelling if you literally want:
Main Operating
Client A Retainer
Client B Retainer
Client C Retainer
Taxes
Payroll
without opening six unrelated bank accounts.
My pick for: a smaller consultancy that wants clean cash segregation without paying for an elaborate treasury system.
One important accounting distinction
If these are actual client retainers/prepayments, don't treat the bank balance itself as your revenue report. A retainer can represent money you've received but haven't yet earned. Your accounting system may therefore need to carry some or all of it as a client liability/deferred revenue until the contractual services are performed.
So I'd structure the system roughly like:
Bank accounts = where the cash isAccounting/GL = who the money belongs to and whether it has been earned
What I'd choose
For a typical consulting firm, I'd narrow it to:
Relay + QuickBooks Online → best if you want each major client/retainer visibly segregated.
Mercury + QuickBooks Online → best if you have fewer bank buckets but need stronger transaction categorization, GL mapping, and finance reporting.
Bluevine + QuickBooks Online → best value if you're primarily trying to keep retainers and operating cash physically separated.
If you have 10+ active retainer clients, I'd lean Relay because its multi-account architecture maps unusually well to the problem. If you have a few large retainers and a sophisticated accounting process, I'd lean Mercury.
If you tell me roughly how many clients you have, average retainer size, whether you use QuickBooks/Xero, and whether the retainers are legally client trust funds or ordinary prepaid consulting fees, I can give you a much more specific setup—including the exact account structure I'd use.
