How to Prepare for a Series A Financial Audit: Step-by-Step
Why This Matters
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.
Prerequisites / What You'll Need
- Accounting software with at minimum 2-3 years of transaction history (QuickBooks Online, Xero, NetSuite)
- Access to all bank and credit card statements for the audit period
- All customer contracts and revenue-generating agreements
- Cap table management software (Carta, Pulley) or a meticulously maintained Excel cap table
- Board resolutions and minutes for all material decisions
- A CPA or fractional CFO to help coordinate the process (strongly recommended)
- Budget: $25,000-75,000 for a startup audit depending on complexity and firm size
Step 1: Clean Up Your Books
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:
- Identifying all subscription payments received in advance and establishing deferred revenue balances
- Accruing expenses for services received but not yet invoiced (accrued liabilities)
- Recognizing all revenue earned but not yet billed (unbilled receivables)
- Booking depreciation and amortization on fixed assets
**Reconcile all balance sheet accounts:**Every balance sheet account should be reconciled to supporting documentation:
- Cash: Bank statements reconcile to QuickBooks cash balance to the penny
- Accounts receivable: AR aging report matches customer invoices; all invoices tested against contracts
- Deferred revenue: Schedule of all prepaid subscriptions tested against contracts and payment receipts
- Fixed assets: Asset register with purchase dates, costs, and accumulated depreciation
- Accounts payable: AP aging tested against vendor invoices
**Clean up the equity section:**The equity section is often the messiest part of early-stage startup books. Ensure:
- All SAFE notes and convertible notes are properly classified (debt vs. equity depends on terms; typically SAFEs are equity; convertible notes with specific maturity dates are debt)
- Common and preferred stock are correctly issued and recorded at proper valuations
- Stock option grants are properly reflected using fair value accounting (ASC 718)
- Par value is correctly stated
Engage a CPA with startup audit experience before the auditors arrive. The "pre-audit" cleanup phase typically takes 4-8 weeks.
Step 2: Organize Equity and Cap Table
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:
- Board resolution authorizing the issuance
- Purchase agreement or SAFE agreement signed by both parties
- 83(b) election filed within 30 days (for founders with vesting schedules)
- Certificate issued (for stock) or agreement executed
- Consideration received (cash, services, IP transfer)
**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.
Step 3: Document All Accounting Policies
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.
Step 4: Prepare Supporting Schedules
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.
Step 5: Reconcile Payroll
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.
Step 6: Organize Contracts and Legal Documents
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.
Step 7: Select and Brief Your Auditor
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:
- Business model overview: What do you sell, to whom, how is it priced?
- Revenue recognition approach: Walk through your ASC 606 policy
- Key transactions during the audit period: Significant equity rounds, acquisitions, one-time items
- Known issues: If you know about accounting problems from prior periods, tell your auditor upfront — discovering them mid-audit is far more disruptive
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.
Common Mistakes to Avoid
- Cash-basis books when raising growth capital: Investors and auditors expect accrual basis; cash-basis records require extensive adjustment
- Deferred revenue not tracked: If you have been recognizing annual subscription payments in full when received, you need to restate multiple periods
- Cap table mismatches: Any discrepancy between Carta, your accounting records, and state filings will stop the audit cold
- Missing board consents for equity grants: Options granted without board authorization are potentially void
- No 409A valuations for option grants: Creates significant employee tax liability and audit complications
- Waiting too long to start: Beginning audit prep the same month you want to close your round is a recipe for a failed or delayed close
Recommended Tools
- Pilot — Investor-grade bookkeeping service specializing in startups; books are designed to be audit-ready
- Carta — Cap table management with legal-grade equity tracking; essential for audit preparation
- Pulley — Alternative cap table tool with clean equity management and 409A integration
- Google Drive / Notion — Organize your virtual data room for contract and document management
- Armanino / Withum — Startup-specialist accounting firms with extensive Series A audit experience
Final Tips / Next Steps
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.
