Financial due diligence for a Series A is narrower than founders expect and deeper than they’re prepared for. Investors are not auditing you. They are testing three things: whether your reported numbers are real, whether your cost structure is what you say it is, and whether there’s anything in the corporate or financial history that creates risk for them. Almost every deal that gets slow or repriced in diligence gets there because one of those three answers took too long to produce.
The work of preparing is mostly done before the term sheet. If you’re reading this with a signed term sheet in hand, skip to the data room section and start assembling, but understand you’re now doing in three weeks what should have taken three months.
What investors are actually testing
Are the numbers real? Does reported revenue tie to cash collected and to signed contracts? Does the ARR number in the deck reconcile to the accounting system? Are there customers in the count who churned, never paid, or signed a pilot that hasn’t converted?
Is the cost structure honest? Is gross margin calculated with a defensible cost of revenue, or is hosting and support buried in operating expenses to make the margin look better? Is stock comp expense recorded? Is the burn number in the deck the same burn number the bank statements produce?
Is there hidden risk? Unrecorded liabilities. A misclassified contractor who should have been an employee. Payroll registered in one state while people work in four. A cap table that doesn’t tie to the stock ledger. An expired 409A. Sales tax never collected in states where nexus was triggered two years ago.
None of these kill a good deal on their own. What they do is consume the weeks between term sheet and close, and every week of delay is a week the investor is discovering things about how you operate.
Twelve months out: build the foundation
This is the cheapest and most effective time to do the work, and almost nobody does it.
Get on accrual accounting and stay there. Investors expect GAAP-basis financials. If you’re on cash basis, the conversion is a project in itself, and our guide to cleaning up and catching up startup books covers where it fits in the sequence. Doing it under deadline is where restatements happen.
Close the books monthly, on a calendar. Reconciled, reviewed, and issued within a defined number of business days after month end. Twelve months of consistent closes is itself a diligence signal. It tells an investor the finance function is real.
Fix revenue recognition before it’s a finding. If you have multi-year contracts, usage-based pricing, implementation fees, or anything other than flat monthly subscriptions, your revenue recognition policy needs to exist in writing and be applied consistently. Our ASC 606 guide covers what auditors and diligence teams look for.
Record stock compensation expense. If you’ve granted options and there’s no expense on the P&L, your operating expenses are understated. ASC 718 is the standard and this is a routine finding.
Keep the 409A current. Stale valuations create option pricing problems that surface at exactly the wrong moment. Our 409A explainer covers the refresh triggers.
Reconcile the cap table to the stock ledger. Carta or Pulley showing one thing and the board consents showing another is a legal diligence problem that lands on finance to untangle.
Clean up state registrations and payroll. If you hired remotely and never registered in those states, that’s an accruing liability. Our multi-state employment guide has the specifics.
Six months out: build the story
Lock the metrics definitions. ARR, net revenue retention, gross margin, CAC, payback. Each one needs a written definition, a calculation that ties to the accounting system, and a consistent history. The failure mode is a deck metric that can’t be reproduced from the general ledger. Investors notice immediately, and it colors everything after.
Our piece on SaaS metrics that matter at Series B covers the definitions; the same discipline applies a stage earlier.
Build the model from the unit economics up. Not an update of the last model. A fresh build with current pricing, current cohort behavior, current hiring costs. Investors don’t scrutinize your projections nearly as much as they scrutinize whether you can defend the assumptions underneath them. Our piece on what investors look for in a financial model covers the distinction.
Know your runway cold. Gross burn, net burn, and the runway number under at least three scenarios. If a partner asks how long your cash lasts and you give a different answer than your model does, that’s the whole meeting. See burn rate and runway.
Write the variance explanations. Every material miss against plan over the trailing period needs a one-sentence reason that you can say out loud without preamble.
Three months out: assemble and pressure-test
Build the data room before you need it. Full checklist below.
Run a mock diligence. Have someone outside the company (your fractional CFO, an advisor, a friendly investor) work the checklist and try to break it. The findings from a mock are free. The same findings in real diligence cost negotiating leverage.
Prepare the customer and revenue detail. A customer-level revenue schedule by month, with logo, contract value, start date, renewal date, and status. This single file answers a large fraction of diligence questions before they’re asked.
Get legal and finance aligned. Board consents, equity grants, and the stock ledger have to agree. This is the most common last-mile problem in a Series A close.
The data room: financial documents checklist
Organized by folder, in the order investors tend to work through them.
Financial statements
- Monthly P&L, balance sheet, and cash flow statement since inception (or trailing 36 months)
- Annual statements by fiscal year
- Trial balance, most recent period
- Current chart of accounts
- Any audited or reviewed financials, if they exist
- A written summary of accounting policies: basis of accounting, revenue recognition, capitalization thresholds
Revenue detail
- Customer-level revenue by month with logo, contract value, start and renewal dates
- ARR or MRR build, reconciled to the general ledger
- Cohort retention and net revenue retention calculation with supporting data
- Deferred revenue schedule and rollforward
- Executed customer contracts and the standard form
- Churn detail with reasons
Cost structure and burn
- Gross margin calculation showing what’s included in cost of revenue
- Operating expense detail by department
- Headcount roster with role, start date, compensation, location, and employment classification
- Monthly burn analysis, gross and net
- Vendor list with material contracts and commitment terms
Cash and banking
- Bank statements for all accounts, trailing 12 to 24 months
- Bank reconciliations
- Debt agreements, venture debt, credit facilities, and equipment financing
- Any covenant compliance certificates
Equity and cap table
- Cap table, fully diluted, reconciled to the stock ledger
- Stock option plan documents and grant history
- Board consents for all equity issuances
- SAFE and convertible note agreements with conversion mechanics
- Current and prior 409A valuation reports
- ASC 718 expense calculation
Tax and compliance
- Federal and state income tax returns, all filed years
- State registrations, payroll tax and sales tax
- Sales tax nexus analysis and filing status
- R&D tax credit studies and payroll tax offset elections
- Delaware franchise tax filings
- Payroll reports from the provider, quarterly and annual
Forecast
- Current operating model with assumptions documented
- Historical plan versus actual, at least the trailing four quarters
- Scenario cases and the trigger points for each
- Hiring plan tied to the revenue assumptions
Corporate
- Certificate of incorporation and all amendments
- Bylaws
- Board minutes and consents
- Prior financing documents
The five findings that slow deals down most
ARR that doesn’t tie to the general ledger. The deck says one number, the accounting system produces another, and nobody can bridge them. Fix the bridge before diligence, and if the two legitimately differ, be the one who explains why first.
Gross margin that moves when someone asks what’s in it. If cost of revenue was never properly defined, your margin has been an estimate. Investors will rebuild it their way.
Contractors who look like employees. Full-time work, company equipment, set hours, paid on a 1099. This is a real accrued liability and it surfaces in almost every diligence process.
A cap table that disagrees with the stock ledger. Grants made without board consents, exercises never recorded, an option pool that doesn’t reconcile. Slow to fix, and it delays closing rather than repricing the deal.
Sales tax nexus never analyzed. Software is taxable in a growing number of states. If you crossed economic nexus thresholds two years ago and never registered, the exposure accrues with penalties and interest. It’s usually quantifiable and manageable, but only if you find it, not if they do.
Who does this work
At Series A, this is controller-and-CFO-level work sitting on top of clean bookkeeping. A bookkeeper can produce the statements; they generally cannot build the ARR-to-GL bridge, defend the revenue recognition policy, or run the diligence process while the founder is running the raise. Our fractional CFO versus controller versus VP Finance piece covers where the line falls.
The founders who come out of diligence fastest are the ones who had one person owning the response: assembling the room, answering the questions, and keeping the investor’s list moving, while the CEO stayed focused on the partners.
Common questions
When should I start preparing for Series A due diligence?
Twelve months before you plan to raise, if you want it to be cheap. Three months if you want it to be adequate. After the term sheet, you’re doing damage control, and it’s visible.
How long does financial due diligence take at Series A?
Typically two to six weeks alongside legal and commercial diligence. Well-prepared companies land at the short end. The variable is almost never the investor’s speed. It’s how fast you can produce what they ask for.
Do I need audited financials for a Series A?
Usually not. Most Series A investors accept unaudited GAAP-basis financials from a credible finance function. Audits become standard at Series B and later, or earlier if a lender requires one. Our first audit playbook covers what that process looks like when it arrives.
What’s the single most common finding?
Revenue that doesn’t reconcile between the deck, the CRM, and the accounting system. It’s rarely deliberate. It’s usually three systems maintained by three people with three definitions. Build the reconciliation yourself, before anyone asks for it.
Should I disclose a problem I found during my own prep?
Yes, and early. A quantified issue you raise with a remediation plan attached is a competence signal. The same issue discovered by their diligence team in week four is a trust problem.
Preparing for a raise, or already in diligence and finding gaps? We do this work for venture-backed companies every quarter. Start a conversation and we’ll tell you where you actually stand.