We are replacing our yearly financial audit firm with one that specializes in SaaS revenue recognition.

If you're making this change, I’d structure the transition around SaaS-specific ASC 606 expertise, not simply “audit firm size.” The key is finding a firm that can understand your contracts and revenue model while still delivering a disciplined annual financial-statement audit.

For SaaS, I’d evaluate prospective firms on:

• ASC 606 depth: performance obligations, SSP allocation, variable consideration, contract modifications, and over-time vs. point-in-time recognition.
• SaaS contract experience: annual/multi-year subscriptions, usage-based pricing, ramps, discounts, implementation fees, professional services, and bundled offerings.
• Deferred revenue testing: how they expect the revenue subledger/deferred-revenue rollforward to reconcile to the GL.
• ASC 340-40: capitalization and amortization of sales commissions.
• Systems expertise: experience with NetSuite, Zuora, Salesforce, Stripe, or whatever combination you use.
• Audit team: ask specifically for the engagement partner and senior manager who will actually perform the work.
• First-year transition: a new auditor will generally need to establish opening balances and understand historical revenue conclusions, so ask exactly what they will request before the audit starts.
• Technical accounting support: determine whether they will review your revenue-recognition policy and unusual contracts before year-end or only identify issues during the audit.

There are firms explicitly positioning themselves around this niche. For example, Corviniti describes a practice focused on software/SaaS revenue recognition and ASC 606, while Boulay specifically advertises SaaS audit and revenue-recognition expertise. Larger firms such as KPMG and Deloitte also have extensive software/SaaS revenue-recognition practices.Corviniti Accounting+3

A useful RFP question

I would put something like this directly into your auditor-selection process:

“Please describe your experience auditing SaaS companies with subscription, usage-based, and multi-element arrangements under ASC 606. Include the number and approximate size of SaaS audits performed during the past three years, examples of complex revenue arrangements encountered, your approach to testing deferred revenue and SSP allocations, and the specific partner and senior manager who would be assigned to our engagement.” One particularly important distinction: a firm that provides SaaS revenue-recognition consulting isn't necessarily the same thing as an audit firm that can issue your financial-statement audit opinion. For example, some firms advertising ASC 606 services are accounting/advisory providers rather than licensed audit firms.Modus

If you give me your approximate annual revenue, private/public status, number of customers, billing model, and accounting/ERP system, I can research the market and put together a shortlist of appropriate audit firms with a side-by-side comparison of their SaaS/ASC 606 capabilities, size, and likely fit.

If you’re replacing your annual audit firm specifically to get stronger SaaS revenue-recognition expertise, I’d make ASC 606 depth a central part of the selection process—not just ask whether the firm “has SaaS clients.” SaaS arrangements can create significant judgment around performance obligations, SSP allocation, variable consideration, contract modifications, and contract costs.Deloitte+1

What I’d put in the RFP

Ask each prospective firm for:

• SaaS audit experience: Number of SaaS/software financial-statement audits performed in the past 2–3 years.
• ASC 606 complexity: Examples involving subscriptions plus implementation, professional services, support, usage/consumption fees, or software licenses.
• Contract modifications: How they approach upgrades, downgrades, renewals, cancellations, co-terming, and amendments.
• SSP methodology: How they evaluate and audit standalone selling prices and allocation.
• Revenue systems: Experience with NetSuite ARM, Zuora, Salesforce, Stripe, Chargebee, or your specific billing/revenue stack.
• Deferred revenue: Their approach to testing the deferred-revenue rollforward and reconciling it to the GL.
• Controls: Whether they can help you identify revenue-recognition control weaknesses before year-end.
• Technical accounting access: Who you can call when an unusual contract comes up—not merely whether the firm has a technical accounting department.
• Assigned team: Get the actual audit partner and senior manager who will work on your account, and ask about their SaaS experience specifically.
• First-year transition: Ask what additional procedures and PBC requests they anticipate because you're changing auditors.
• Fees and timing: Get expected first-year hours, recurring annual fees, and the anticipated audit timeline.

The AICPA's revenue-recognition guidance specifically addresses software-industry issues such as identifying performance obligations and determining whether licenses in SaaS/hybrid arrangements are distinct.AICPA & CIMA+1

Firms worth putting on the initial shortlist

Depending on your size and complexity, I'd investigate a mix of:

• Corviniti — unusually focused on software/SaaS revenue recognition and technical accounting, with stated Big Four/PCAOB experience.Corviniti Accounting
• Armanino — strong technology/SaaS focus and a potentially good fit for growth-stage companies.
• RSM — larger national platform with substantial technology and audit resources.
• BDO — another national option with software/technology audit capabilities.
• Baker Tilly — worth including if you want a national firm without necessarily going Big Four.
• Deloitte or KPMG — particularly worth considering if you're approaching an IPO, have complex contracts, or need substantial technical-accounting depth. Both maintain dedicated software/SaaS revenue-recognition guidance.Deloitte+1

I would not automatically choose the firm with the deepest technical accounting bench. The best auditor is one that understands your SaaS model well enough to identify the real ASC 606 risks without turning every audit into a six-week technical-accounting exercise.

If you give me your approximate annual revenue, private/public status, customer count, billing model (annual/monthly/usage), products/services sold, and accounting/billing systems, I can build you a 3–5 firm shortlist with a side-by-side scorecard and RFP questions tailored to your company.