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A Series A audit demands clean, GAAP-compliant books and organized documentation. This guide shows exactly what to prepare and in what order.
Not always — some Series A investors accept reviewed financial statements (less rigorous than a full audit) or very thorough financial due diligence from their own team. However, institutional investors with larger check sizes, particularly those with LPs who have strict requirements, often require two years of audited GAAP financials. Even if not required to close, having audited financials significantly increases investor confidence and can accelerate the diligence process. Most companies that plan to raise a Series B or eventually go public will need audited statements anyway.
A compilation is simply the accountant organizing your financial data into proper financial statement format — no verification of accuracy. A review involves analytical procedures and inquiry to provide limited assurance that statements are not materially misstated. An audit is the highest level: the auditor tests transactions, confirms balances with third parties, and provides positive assurance that statements are presented fairly in accordance with GAAP. Audits cost 3-5x more than reviews but provide substantially more credibility.
The total process from engagement to issued financial statements typically takes 3-4 months for a first-year startup audit: 4-6 weeks of client preparation, 2-4 weeks of auditor fieldwork (testing transactions, confirming balances, reviewing contracts), 4-6 weeks of review, resolution of open items, and partner sign-off. Subsequent year audits (where opening balances are already audited) typically take 8-10 weeks. Build this timeline into your fundraising plan.
The most common issues are: revenue recognized on a cash basis instead of ratable/accrual basis (creating deferred revenue restatements), missing or incorrect 409A valuations for option grants, cap table discrepancies (differences between Carta, accounting records, and state filings), improper classification of convertible notes or SAFEs, missing board consents for material transactions, and lease accounting not updated for ASC 842. Most of these can be identified and fixed in a pre-audit cleanup engagement before formal audit begins.
Expect $25,000-75,000 for a startup-specialist regional firm (Armanino, Withum, Marcum, Moss Adams) covering two years of financial statements. Big 4 firms charge $75,000-200,000+ for similar scope. Costs increase with: number of years being audited, transaction complexity, international operations, acquisition history, and degree of disorganization in existing books. Well-prepared companies with clean books and organized documentation consistently pay at the low end of the range.
2026/05/10
The Series A fundraising process is the moment when a startup's financial records face their first serious external scrutiny. Whether a formal GAAP audit by an accounting firm or financial due diligence conducted by the investor's deal team, the findings will directly affect your valuation, your terms, and whether the deal closes at all. Investors who discover accounting problems during diligence — cash-basis books when accrual was expected, revenue recognized incorrectly, a cap table that does not match SEC filings — either walk away or renegotiate terms at a lower valuation with more protective provisions.
The stakes are not just about the current round. Audited financial statements become part of your company's permanent record. Every future investor, acquirer, or IPO underwriter will review your Series A audit. Restatements discovered later are expensive, time-consuming, and reputation-damaging. Getting it right at Series A sets the foundation for every subsequent financing and, eventually, a public market debut.
Many founders are surprised by how much preparation a Series A audit requires. The typical process takes 3-4 months from kickoff to issuance of audited financial statements. Founders who start preparing 6 months before they plan to raise have a dramatically better experience than those who try to clean up their books in 4 weeks while simultaneously running an active fundraising process.
This guide tells you exactly what to prepare and in what order.
The first thing auditors will do is test whether your accounting is on an accrual basis and compliant with GAAP. For many early-stage startups that have been running on a cash-modified basis, this requires significant cleanup.
**Switch from cash to accrual basis:**If you have been recognizing revenue when cash is received rather than when it is earned, you need to convert to accrual. This means:
**Reconcile all balance sheet accounts:**Every balance sheet account should be reconciled to supporting documentation:
**Clean up the equity section:**The equity section is often the messiest part of early-stage startup books. Ensure:
Engage a CPA with startup audit experience before the auditors arrive. The "pre-audit" cleanup phase typically takes 4-8 weeks.
Auditors will spend significant time on your equity section and capitalization table. Discrepancies between your accounting records, your cap table, and your corporate secretary filings are extremely common and must be resolved before audit begins.
**Use professional cap table software:**If you are still managing your cap table in Excel, migrate to Carta or Pulley before your audit. These platforms create a legally defensible record of equity ownership that integrates with your corporate documents.
**Verify every equity event is documented:**For every equity issuance (common stock, preferred stock, SAFEs, options, warrants), verify:
**409A valuations are required for option grants:**Every time you grant stock options, you need a current 409A independent valuation to set the exercise price. If you have granted options without 409A valuations, or at a strike price below FMV, this creates significant tax liability for employees under IRC 409A. Retroactively fixing these situations is expensive and time-consuming; do it before the audit.
**Reconcile to state filings:**Shares authorized and issued in your accounting records must match what is filed with your state of incorporation. Pull your Delaware Certificate of Incorporation, all certificates of amendment, and verify share counts. Any discrepancies require a corporate action (certificate of correction, board resolution) to fix.
Auditors will request your accounting policies memorandum — a document that describes how you account for the key areas of your business. If this does not exist, you need to write it before audit fieldwork begins.
Your accounting policies document should cover:
Revenue recognition: How do you apply ASC 606? What are your performance obligations? When do you recognize revenue for subscriptions, professional services, setup fees? How do you treat contract modifications?
Expense recognition and accruals: When do you accrue for expenses? What is your policy for prepaid expenses and amortization?
Equity compensation (ASC 718): How do you value stock option grants? What inputs do you use in your Black-Scholes model (risk-free rate, volatility, expected term)? How do you handle forfeitures?
Capitalized software (ASC 350-40): Do you capitalize any internal software development costs? What is your policy for the preliminary project stage vs. application development stage? What is your amortization period?
Leases (ASC 842): Do you have office leases that require recognition as right-of-use assets? As of 2022, all leases over 12 months must be on the balance sheet.
Business combinations: If you have acquired any companies, how did you account for them?
Having a documented policy is not just a compliance exercise — it forces you to think through your accounting treatment carefully before auditors challenge it.
Auditors will request a comprehensive set of supporting schedules during fieldwork. Prepare these in advance to reduce the time and cost of the audit:
Deferred revenue rollforward: Starting balance → new billings → revenue recognized → ending balance, by month, for the full audit period. This is the most important schedule for a SaaS company.
AR aging report: Outstanding receivables by customer, aged by 30/60/90/90+ day buckets. Be prepared to explain any balances over 60 days (are they collectible? is there a dispute?).
Fixed asset register: All assets, purchase date, cost, accumulated depreciation, net book value. Tie to your balance sheet exactly.
Prepaid expense schedule: All prepaid expenses, the periods they cover, and the monthly amortization.
Accrued liabilities schedule: All accruals at period end — what they are for, the basis for the estimate, and the expected payment date.
Option activity rollforward: Beginning balance → grants → exercises → forfeitures/expirations → ending balance. Tied to your cap table and 409A valuations.
Loan and debt schedule: For each debt instrument, principal balance, interest rate, maturity date, and whether interest is current.
Prepare these schedules in Excel with clear headers, formulas visible (no hardcoded numbers), and tied to your accounting software reports where possible. Auditors appreciate — and trust — schedules they can trace back to source data.
Payroll is an area where errors compound over years and auditors look closely. Before fieldwork:
W-2 reconciliation: Your W-2s issued to employees must match your payroll records for the year. Pull the annual payroll register from Gusto/ADP/Rippling and verify total wages match the W-2 total for each employee.
Benefits reconciliation: Health insurance premiums paid by the employer vs. employee should be correctly reflected in payroll as pre-tax or after-tax deductions. 401(k) contributions withheld from employee paychecks must match contributions deposited to the retirement plan.
Employer tax reconciliation: Form 941s filed quarterly must tie to your payroll system. Cumulative payroll tax deposits should match what appears on your bank statement. Any discrepancies in payroll tax deposits or filings need to be corrected before the audit.
Accrued payroll: At your balance sheet date, accrue for wages earned but not yet paid (any days worked in the final pay period not yet paid as of balance sheet date), accrued vacation or PTO balances, and accrued bonuses or commissions.
Payroll discrepancies are common in fast-growing startups where employees in multiple states created registration gaps or where mid-year payroll software switches left reconciliation gaps. Address these before audit.
Auditors will sample customer contracts to verify revenue recognition, test vendor contracts for proper expense and liability treatment, and review corporate documents to verify equity transactions. Organize these in advance:
Customer contracts: Organize all customer agreements in a shared folder. For your largest customers (top 20 by ARR), auditors will almost certainly request the signed agreement, order form, and any amendments. Ensure every contract has a signed copy — "we only have the unsigned version" is a red flag.
Vendor contracts: For significant vendor relationships (your hosting provider, key SaaS tools, office lease), organize the signed agreements. These are needed to verify expense accruals and lease accounting.
Board minutes and resolutions: Organize board minutes and written consents for all material decisions: equity issuances, debt authorizations, executive compensation, major contracts, acquisitions. All major financial events must be authorized by the board and documented.
Employment agreements: For key executives, have signed employment agreements, offer letters confirming compensation, and any severance agreements available.
Corporate formation documents: Certificate of Incorporation, all amendments, bylaws, and any stockholder agreements.
Use Google Drive or Notion to organize these into a virtual data room. Structure it clearly: /Corporate Docs, /Customer Contracts, /Vendor Contracts, /Equity Agreements, /Board Minutes. This same organization will serve you for investor due diligence.
Choosing the right audit firm matters. Your options:
Big 4 (Deloitte, PwC, EY, KPMG): Adds credibility for IPO-track companies but expensive ($75,000-250,000+ for a startup audit) and often assigns less experienced staff to small company clients.
Regional firms (Grant Thornton, BDO, RSM): Good balance of credibility and cost. Appropriate for most Series A companies.
Startup-specialist firms (Armanino, Moss Adams, Withum, Marcum): Deep startup and SaaS experience, lower cost ($25,000-75,000 range), and staff who understand SaaS accounting. Best choice for most Series A-stage companies.
Brief your auditor thoroughly at engagement kickoff:
Provide auditors with the supporting schedules from Step 4 on the first day of fieldwork. Auditors who receive organized, complete work papers produce faster, lower-cost audits.
Start the audit preparation process 6 months before you plan to close your Series A. Engage your audit firm 3-4 months before your target close date — good startup audit firms book out quickly. Brief a fractional CFO or experienced startup CPA to run the process internally so the audit does not become the founder's full-time job during fundraising. And after the audit, do not let your books decay — maintain audit-ready standards year-round so your Series B audit is a much lighter lift.