The term sheet arrives. Everyone celebrates. Then due diligence starts — and for many startups, what follows is weeks of scrambling to produce financial information they should have had ready months earlier.
Financial due diligence is the process by which an investor (or acquirer) independently verifies the financial health, integrity, and prospects of your business before committing capital. It is not a formality. It is a forensic examination. Deals that looked certain at term sheet regularly fall apart or reprice during diligence — almost always because something was found that the founder hadn't anticipated, or couldn't explain.
This guide covers exactly what investors examine during financial due diligence, the most common issues that surface, and how to get ahead of all of it before you need to.
What investors are actually trying to find out
Before getting into the specifics, it helps to understand the investor's mindset during diligence. They are not looking for reasons to say no. They are stress-testing their conviction — verifying that the business they agreed to back in principle is the business that actually exists in the financial records.
Three questions drive every diligence request:
1. Are the numbers accurate? Does the financial model presented in the pitch reflect the actual financial position of the business? Are the metrics calculated consistently? Is revenue recognised correctly?
2. Is the business model sound? Do the unit economics hold up under scrutiny? Is the path to profitability credible when the assumptions are stress-tested? Are the historical trends genuinely representative of future performance?
3. Are there hidden risks? Undisclosed liabilities. Revenue concentration that makes the business fragile. Customer contracts with unfavourable terms. Founder loans that haven't been disclosed. Legal claims in progress.
The data room is your answer to all three questions. Everything in it either builds or erodes confidence in the above.
The financial due diligence checklist: what they will ask for
Historical financials
- Last 2–3 years of management accounts (P&L, balance sheet, cash flow statement) — monthly
- Annual statutory accounts (if available), signed by auditors or accountants
- Current year management accounts to the most recent month-end
- Reconciliation between management accounts and statutory accounts where they differ
What they're looking for: Consistency between what was represented in the pitch and what the books show. Any divergence between management accounts and statutory accounts needs a clear explanation.
Revenue analysis
- MRR/ARR bridge for the last 12–24 months (showing new, expansion, contraction, and churned ARR)
- Revenue by customer, showing concentration (how much revenue comes from the top 5, top 10 customers)
- Revenue by product or segment
- Deferred revenue balance and movement schedule
- Average contract value and contract length trends
What they're looking for: Customer concentration risk (a business where one customer represents 30%+ of revenue is a materially different risk profile than the pitch may have suggested), accurate ARR calculation, and whether reported growth rates are genuinely organic or inflated by definition changes.
Customer and contract data
- Full customer list with contract start date, contract value, renewal date, and status
- Copies of standard customer contracts (key terms: notice period, termination rights, SLAs, liability caps)
- Churn log — every customer who has left in the last 24 months, with reason codes
- Pipeline summary and recent win/loss data
What they're looking for: Contract terms that limit pricing power, high churn rates not visible in the headline NRR figure, or a pipeline that is systematically optimistic (investors track forecast-to-close conversion rates).
Cost structure and headcount
- Headcount schedule: every employee, role, department, start date, and salary
- Contractor and freelancer agreements (particularly relevant for businesses that rely heavily on contractors — there are tax and employment classification risks)
- Equity and option schedule: all grants, vesting schedules, exercise prices
- Key supplier contracts and payment terms
What they're looking for: Hidden liabilities in contractor misclassification, equity dilution that wasn't fully disclosed, and whether the cost structure is genuinely scalable or relies on unsustainable inputs.
Cash and debt
- Bank statements for the last 12–24 months
- Cap table (fully diluted)
- Any debt facilities, convertible notes, SAFEs, or other instruments outstanding
- Related-party loans or transactions (founder loans to/from the company)
- Any personal guarantees given by founders
What they're looking for: Undisclosed debt, related-party transactions that weren't disclosed, and any instruments that will convert or create dilution at closing.
Tax and compliance
- VAT registration and recent returns
- Corporate tax position — any open assessments, disputes, or deferred tax liabilities
- R&D tax credit claims (particularly relevant in the UK, Ireland, and other jurisdictions with generous schemes)
- Payroll tax compliance
What they're looking for: Tax liabilities that aren't on the balance sheet and would become the investor's problem post-investment.
The issues that most commonly kill or reprice deals
After seeing this process from multiple sides — as a fractional CFO preparing companies for diligence and as an advisor during transactions — these are the patterns that surface repeatedly:
Revenue that doesn't match the model. The pitch deck showed €1.2M ARR. The data room shows €980K when the investor's analyst recalculates it using consistent methodology. The gap is explainable — one customer on a non-standard contract, a pilot that was included in the ARR figure — but the fact that it requires explanation is itself a problem. Every unexplained gap requires a conversation. Multiple unexplained gaps create doubt about everything.
Customer concentration that wasn't disclosed. "We have 40 customers" sounds like a diversified base. When the revenue analysis shows that two customers represent 55% of ARR, the risk profile of the business changes materially. This isn't necessarily a deal-killer, but it needs to be proactively disclosed — not discovered.
Churn that looks different in the data than in the pitch. Gross revenue retention of 85% was described as "strong retention." The churn log shows that 12 of the last 20 churned customers were in the target segment, and the 85% GRR is being held up by two large expansions that are potentially non-recurring. The NRR metric was accurate; the narrative around it was not.
Related-party transactions. A founder loan to the company of €150,000 that doesn't appear on the balance sheet. Software licensed from a company the CEO has an equity stake in, at above-market rates. These issues are solvable with disclosure; undisclosed, they create legal and trust problems that can derail a transaction.
The financial model doesn't reconcile. The model shown in the pitch has a cash balance at month 18 that doesn't match any defensible cash flow calculation. When the investor's team builds their own model from the historical data, the trajectory looks materially different from what was presented. This is the issue that most directly reflects on management credibility.
How to prepare: the pre-diligence readiness checklist
The ideal time to prepare for due diligence is 6–12 months before you expect to start a raise. Here's what that preparation looks like:
Build a live data room. Use a service like Notion, Docsend, or Google Drive (with appropriate access controls) to maintain an always-current repository of key financial documents. Don't build the data room when the term sheet arrives — maintain it continuously.
Reconcile your ARR calculation methodology. Define precisely how you calculate ARR, document the methodology, and apply it consistently every month. If you've changed the definition — as many companies have as their product evolves — document the change and provide a restated historical series.
Make the books easy to re-cut. Investors will slice your P&L by product, customer and cost centre. With a clean chart of accounts that is a query; without one it is a project that runs during diligence. See chart of accounts best practices.
Prepare the MRR bridge. A month-by-month bridge showing opening ARR + new + expansion - contraction - churn = closing ARR is one of the first things a serious investor will build. Having it ready immediately signals preparedness and avoids the appearance that you have something to hide.
Clean up the cap table. All convertible instruments should be listed with their conversion mechanics. All option grants should have signed documentation. Any informal agreements about equity need to be formalised before diligence starts, not during it.
Disclose proactively. The issue that kills deals is not the problem itself — it is the discovery of a problem that wasn't disclosed. A business with €200K in outstanding tax liabilities that discloses them clearly and has a repayment plan is in a far stronger position than one where the same liabilities are found by the investor's accountants. Lead with disclosure.
Get your financial model into shape. The financial model should be a 3-statement model with documented assumptions, a clear actuals-to-forecast reconciliation, and a coherent narrative connecting the numbers to the business strategy. It should be the same model you use to run the business — not a special version created for fundraising.
FAQs
How long does financial due diligence typically take? For a Series A investment, 4–8 weeks is typical for the financial component. The full due diligence process (including legal and technical due diligence) typically runs 6–12 weeks from term sheet to close. Being well-prepared can significantly compress this timeline — the fastest closes are those where the data room is complete and the founders can answer questions immediately.
Do I need audited accounts to raise a Series A? Not always, but some institutional investors (particularly in certain European markets) will require audited financials as a condition of investment. Even where it's not required, having audited accounts for the most recent year significantly accelerates the financial diligence process and reduces uncertainty for the investor.
What's the difference between investor due diligence and an audit? An audit is a formal process conducted by a registered auditor that provides an opinion on whether your statutory accounts present a true and fair view, following IFRS or local GAAP. Investor due diligence is a commercial review of financial information by the investor's team or advisors, focused on verifying the investment case rather than producing a formal audit opinion. Both are rigorous, but they serve different purposes.
BB Financial Services Kft helps startups prepare for investor due diligence — from data room construction to financial model integrity reviews. Get in touch before the term sheet arrives, not after.