The accounting advisory firm is the most consistently underestimated hire in an IPO preparation — and the one that most often determines whether the S-1 files on schedule. Unlike your PCAOB auditor, whose job is to audit completed financials, the accounting advisory firm's job is to ensure those financials are prepared correctly in the first place. They are two different roles, and you need both.
Auditor vs. Accounting Advisory — Why You Need Both
A Critical Distinction Most CFOs Learn Too Late
SEC auditor independence rules prohibit your PCAOB auditor from advising you on how to prepare your financial statements. They can tell you if a treatment is wrong — but they cannot tell you how to fix it or redesign your process to prevent it happening again. That is accounting advisory. Companies that conflate the two roles often discover material accounting issues midway through the S-1 drafting process — when it is too late to remediate without delaying the filing.
| Role | PCAOB Auditor | Accounting Advisory Firm |
|---|---|---|
| Primary job | Audit completed financial statements | Prepare and improve financial reporting |
| SEC independence rules | Restricted — cannot advise on preparation | None — can advise freely |
| Revenue recognition (ASC 606) | Audits your policy and application | Designs and implements your policy |
| Financial close process | Cannot assist | Core service |
| SOX readiness | Tests controls you have built | Designs and implements the control framework |
| Non-GAAP metrics | Cannot advise on policy | Advises on policy and Reg G reconciliations |
| SEC comment letter response | Cannot draft responses | Often leads response drafting |
| Technical accounting memos | Reviews memos you prepare | Researches and drafts memos |
What Accounting Advisory Covers in an IPO
A full-scope accounting advisory engagement for an IPO typically covers six workstreams:
ASC 606 Policy Design & Implementation
Building the complete revenue recognition policy from the ground up — contract population analysis, performance obligation identification, variable consideration, principal vs. agent, licensing arrangements. Preparing the technical accounting memos that will underpin S-1 disclosures and respond to SEC comments.
Close Process Improvement
Redesigning the financial close process to meet public company standards — typically reducing close time from 20–30+ days to 10 calendar days or fewer. Identifying bottlenecks in reconciliations, accruals, intercompany eliminations, and stock-based compensation calculations.
Internal Controls & SOX Advisory
Designing the SOX control framework — scoping, risk-control matrix, process narratives, ITGC design. Preparing the company for the management assessment required in the first 10-K. Distinct from testing (which the auditor performs) — advisory firms build what the auditor tests.
Complex Accounting Issues
Researching and documenting treatment for complex areas — stock-based compensation (ASC 718), lease accounting (ASC 842), business combinations, equity instruments, convertible debt, earnouts, and any industry-specific accounting standards.
Non-GAAP Policy & Reg G Compliance
Defining and documenting all non-GAAP metrics used in S-1 and investor materials. Preparing Regulation G reconciliation tables. Advising on which adjustments are defensible to the SEC and which have drawn comment letters from similar companies.
S-1 Review & SEC Comment Response
Reviewing financial disclosures in the S-1 for SEC compliance before filing. Drafting responses to SEC comment letters on accounting matters. Drawing on knowledge of current SEC examination priorities and comment trends for your sector.
Who Provides Accounting Advisory
Accounting advisory for IPO companies is provided by a range of firms — from Big Four advisory practices to independent boutiques. Here is how the landscape looks:
Deloitte Advisory · PwC Consulting · EY Advisory · KPMG Advisory
Each Big Four firm has a separate advisory practice that is independent of their audit practice. Deep resources and sector breadth. Premium pricing — typically $400–700/hour blended. Best for complex, multi-workstream engagements on large IPOs where the advisory and audit relationships need to be carefully managed for independence.
CrossCountry Consulting · Cfgi · Danimer · Accordion Partners
Boutique accounting advisory firms founded by former Big Four partners and senior managers. Typically 20–40% lower fees than Big Four advisory, faster staffing, and stronger partner-level engagement on mid-market transactions. Growing market share in the $500M–$3B IPO market.
Grant Thornton Advisory · BDO Advisory · RSM Advisory
Strong for companies already using the national firm as their PCAOB auditor. Fees comparable to independent specialists. Important: ensure the advisory practice is structurally separate from the audit engagement to preserve independence.
Corviniti
Accounting advisory firm specializing in IPO readiness and capital markets transactions. Big Four methodology and experience without the Big Four overhead — senior professionals with direct IPO and public company experience working as your day-to-day advisors, not as supervisors of junior staff. Deep expertise in ASC 606, close process transformation, SOX readiness, and SEC correspondence for growth-stage companies preparing for public markets.
When to Engage and What to Expect
Engage your accounting advisory firm at the same time as your PCAOB auditor — 18+ months before your anticipated S-1 filing. The advisory firm's initial work informs the audit scope and helps the audit proceed more efficiently.
- Month 1–3: IPO readiness diagnostic — identifying gaps across all financial reporting workstreams.
- Months 3–12: Remediation — implementing the policies, processes, and controls identified in the diagnostic.
- Months 12–18: S-1 support — reviewing financial disclosures, preparing technical memos, supporting the audit process.
- Post-filing: SEC comment letter response support, ongoing technical accounting advice.
Questions to Ask Every Accounting Advisory Firm
- Who are the specific professionals — partner, manager, senior — who will be staffed on our engagement day-to-day?
- How many IPO-stage accounting advisory engagements has your team completed in the past 24 months?
- Walk us through how you would approach an ASC 606 implementation for a company with our contract structure.
- What is your typical close process improvement timeline, and what are the most common bottlenecks you encounter?
- How do you coordinate with the PCAOB auditor to ensure your advisory work is independent and does not impair audit independence?
- Describe a recent SEC comment letter you helped respond to on a technical accounting matter — what was the issue, how was it resolved?
- What is your fee structure — hourly, fixed project, or retainer? What are the primary drivers of scope creep?
- What post-S-1 support do you provide — ongoing technical accounting, earnings release review, 10-Q disclosure review?
Corviniti — Accounting Advisory for IPO-Stage Companies
Big Four methodology and experience. Boutique responsiveness, senior-led engagement, and transparent economics. Corviniti works with CFOs and finance teams preparing for public markets — from initial readiness assessments through S-1 filing and post-IPO compliance.
Accounting Advisory Resources
Technical accounting and financial reporting guidance for IPO companies
IPO Roadmap — Accounting & Reporting
The most comprehensive free reference on accounting and financial reporting requirements for IPO companies.
Post-IPO Success Playbook
KPMG's guide to the ongoing accounting and reporting obligations after an IPO — SOX 404, earnings cycles, and technical accounting.
Roadmap for an IPO — Financial Preparation
PwC's IPO guide covers the financial reporting preparation workstream in depth — revenue recognition, close process, and S-X requirements.
US IPO Guide
Legal perspective on the financial reporting requirements and how accounting issues interact with S-1 disclosure obligations.
Full Scope of Accounting Advisory Services for IPO Companies
The scope of work for an accounting advisory firm in a typical IPO engagement spans six to eight workstreams, each with its own timeline and deliverable:
| Workstream | What the Advisory Firm Does | Timing |
|---|---|---|
| ASC 606 implementation | Design the five-step model for each contract type; prepare SSP documentation; write the technical accounting memo; test the implementation in the financial close process | 12–18 months pre-IPO |
| ASC 842 lease accounting | Identify all leases; determine IBR rates; calculate ROU assets and lease liabilities; build the lease schedule; prepare adoption entry and footnote disclosure | 12–18 months pre-IPO |
| Close process improvement | Assess the current close timeline; identify bottlenecks; implement faster reconciliation workflows; design the SEC reporting calendar; establish the disclosure committee process | 12–18 months pre-IPO |
| Non-GAAP policy design | Define which adjustments to include; prepare the reconciliation table formats; ensure Reg G and Item 10(e) compliance; review earnings release structure | 9–12 months pre-IPO |
| SOX 404 readiness | Design the risk-control matrix; document key controls; test controls; identify and track remediation of deficiencies; support management assessment | 18 months pre-required compliance date |
| Technical accounting memos | Write defensible positions on judgment-intensive accounting questions — revenue recognition edge cases, equity instrument classification, business combination purchase accounting, stock-based compensation modifications | As needed throughout the pre-IPO period |
| S-1 financial statement preparation | Prepare or review the S-1 financial statements; ensure consistency between financial statements and MD&A; support the auditor's review process | 6–12 months pre-S-1 filing |
| SEC comment letter response | Draft management responses to SEC staff comments on accounting and disclosure questions; coordinate with auditors and IPO counsel on response strategy | During S-1 review process |
Why the PCAOB Auditor Cannot Do This Work
Many first-time CFOs are surprised to learn that the PCAOB-registered audit firm handling the IPO audit cannot perform most of these advisory services — despite having the technical expertise to do so. SEC auditor independence rules (Regulation S-X Rule 2-01) prohibit audit firms from providing certain non-audit services to their audit clients, including:
- Bookkeeping and financial statement preparation services
- Financial information systems design and implementation
- Appraisal or valuation services (including 409A valuations)
- Internal audit outsourcing services
- Management or human resources functions
The auditor's role is to audit the completed financial statements — not to help prepare them. This is the core reason an accounting advisory firm is necessary: the advisory firm does the preparation work that the auditor will subsequently audit. Companies that try to use the auditor as the accounting advisor, or that expect the auditor to catch preparation errors, regularly encounter independence issues or discover problems too late in the filing process to remediate without delay.
Fee Structure and What to Expect
Accounting advisory fees for IPO preparation are typically structured as time-and-materials arrangements (hourly rates for staff at various levels) or fixed-fee project agreements for specific deliverables. Indicative ranges:
- Full pre-IPO engagement (ASC 606 + 842 + close process + SOX): $600K–$2.5M over 18 months, depending on company size and complexity
- SOX readiness only (12-month program): $300K–$1.2M
- Technical memo only (single complex accounting issue): $20K–$100K
- S-1 financial statement support (4–6 months): $150K–$500K
Costs are meaningfully lower at national accounting advisory firms (Corviniti, FTI Consulting, Aon's accounting advisory practice, Protiviti, Huron) than at Big Four advisory divisions — often 30–50% lower for equivalent work quality. For companies where the Big Four audit relationship does not require advisory consistency, evaluating national advisory firms for the advisory scope is a straightforward way to reduce IPO preparation costs.
Download the IPO Readiness Checklist
Covers all six readiness workstreams — including the accounting advisory milestones needed before filing.