There is a specific kind of silence founders describe after signing a term sheet. The champagne moment lasts about a day. Then the diligence request list arrives, and it is forty items long, and eleven of them are things nobody in the company has ever produced before.

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That is the moment a round is actually won or lost. Not the pitch. Not the partner meeting. The four to eight weeks afterwards, when somebody who is paid to be sceptical opens your ledger.

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Fewer rounds means more scrutiny per round

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Carta's data on seed cohorts is a useful reality check. In a normal year — take 2018 — roughly 25-30% of companies that raised a seed round would reach Series A within 24 months. For the 2022 cohort, only around 17% made it in the same window.

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The UK picture rhymes. The British Business Bank's Small Business Equity Tracker found seed-stage deals were 27% lower in 2025, with the top ten fundraisings accounting for 23% of all investment into smaller businesses.

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Fewer deals, larger cheques, more competition per slot. Which means investors have something they did not have in 2021: time. Time to read the fine print. Time to ask the second question. Time to walk away over something that would have been waved through three years ago.

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What actually breaks in diligence

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It is almost never the thing founders worry about. Nobody loses a round because their TAM slide was optimistic. They lose it because of these:

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The numbers in the deck do not reconcile to the ledger. ARR in the pitch is a board-deck number built in a spreadsheet. Revenue in the accounts is something else. The difference might be entirely explainable — but if you cannot explain it on the call, you have just taught an investor that your reporting is decorative.

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Revenue recognition has never been written down. Annual contracts billed upfront. Setup fees. Usage overages. Multi-year deals with a break clause. Every one of these is a judgement, and if the judgement lives in a founder's head rather than a policy, diligence will find it and treat it as a red flag rather than a rounding difference.

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There is no monthly close. If your numbers get tidied quarterly, then a diligence request for twelve months of management accounts becomes a three-week archaeology project — during which the round is paused, momentum leaks, and the investor starts to wonder what else is being reconstructed.

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Cohorts cannot be rebuilt from source data. A retention chart that cannot be traced back to individual customers and invoices is a chart, not evidence. Investors will ask for the raw data. Have it.

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The boring paperwork. IP assignments for early contractors. Board minutes for share issues. Employment status for the developer you paid as a freelancer for eighteen months. None of it is glamorous. All of it delays closing, and delay is where valuations get renegotiated.

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The fix is unglamorous and it starts early

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The companies that sail through diligence are not the ones with the tidiest data room. They are the ones who were running a real finance function before anyone asked them to.

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Practically, that means: a monthly close that actually closes. Management accounts that land in the first week, not the third. A model that ties to the accounts rather than living beside them. Contract terms reflected in the ledger, not just in the CRM. And someone whose job it is to ask the awkward question before an investor does.

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Do that for two quarters before you raise and diligence becomes an export, not an excavation.

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The thing nobody tells you

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Diligence is not really an audit of your numbers. It is an audit of how you run the company, using your numbers as the sample.

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An investor looking at a messy ledger is not thinking "this revenue figure might be wrong." They are thinking: if this is how they handle the thing they knew I would look at, what does the rest look like?

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That inference is expensive. It shows up as a slower close, a renegotiated valuation, or a polite email in week six. And it is entirely avoidable — not by preparing harder in the fortnight after the term sheet, but by not needing to prepare at all.

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Raising in the next six months and not sure what diligence will find? Take a free hour with us and we will run the awkward questions before an investor does — no pitch, no boring numbers. Finance leadership, without the headcount.

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Sources: Carta, "Graduation rate from seed to Series A," carta.com ; British Business Bank, "AI dominates UK smaller business equity market with record investment share as overall funding falls slightly" (Small Business Equity Tracker, 2 July 2026), british-business-bank.co.uk