When should a startup set up accounting software — and why "when we're bigger" costs you

The honest answer: earlier than you think, and almost certainly now

Ask most founders when they set up their accounting properly and you'll hear some version of "later than I should have." The instinct is to treat bookkeeping as a problem for a bigger, busier version of the company — something to sort out once there's revenue, or staff, or an accountant telling you to. So it gets pushed. Transactions pile up in a bank account and a shoebox of receipts, and the setup becomes a cleanup.

The honest answer is that the right time to set up accounting software is the moment your company starts moving money — which, for a newly funded startup, is right now. Not because a rule says so, but because the cost of doing it early is tiny and the cost of doing it late compounds every week you wait.

Pre-revenue is not pre-transaction

The most common reason founders delay is "we don't have revenue yet, so there's nothing to account for." This confuses two different things. Accounting isn't triggered by money coming in — it's triggered by money moving. And a funded pre-revenue startup moves a lot of money: cloud subscriptions, contractor invoices, a co-founder's salary, hardware, legal fees for the round itself. Every one of those is a transaction that belongs in your books.

In fact the pre-revenue phase is often when the spending is messiest — lots of small, varied purchases across tools and services as you build. That's precisely the activity you want captured cleanly and automatically, not reconstructed from memory in ten months.

The trigger events — hit any one and it's time

If you want concrete signals rather than "as soon as possible", set up your software the moment any of these becomes true. For most newly funded startups, several are already true on day one.

You've opened a business bank account. The instant there's an account, there's a feed to connect and transactions to record. This is the cleanest possible starting point — begin here and you never have a gap. (Opening the account is step one; see Opening your startup's business bank account →.)

You've taken outside money. Once there are investors, there are people who will eventually want to see numbers, and there are SEIS/EIS and share records that have to be right. Funded companies are held to a higher standard than side projects — start as you'll need to continue.

You're paying anyone — including yourself. A salary, a contractor, a freelancer. The moment payroll or supplier payments start, you have obligations (PAYE reporting, records of who was paid for what) that a spreadsheet handles badly.

You're spending on more than one or two things a month. Once there's a steady stream of card payments and bills, manual tracking stops being realistic and starts being a source of error.

You might register for VAT soon. If you're near the threshold or planning to register voluntarily, you need Making Tax Digital–compatible software to file — and you want it in place before the VAT period you'll be reporting, not scrambling after. See When do I have to register for VAT → and What is Making Tax Digital →.

Why "when we're bigger" is the expensive choice

Waiting feels free. It isn't — it just moves the bill to later and adds interest. Here's what "we'll sort it when we're bigger" actually buys you:

Reconstruction instead of recording. Recording a transaction as it happens takes seconds and the context is fresh — you know what that £240 payment was for. Reconstructing it eight months later means staring at a bank line with no receipt, guessing the category, and hoping you're right. Multiply by hundreds of transactions and you have a project, usually one you pay an accountant to do at their hourly rate.

Lost VAT and lost deductions. Money you could have reclaimed — VAT on your spend, allowable expenses against Corporation Tax — quietly leaks away when the records aren't there or the receipts are gone. See What can I claim as a business expense →.

Personal and business money tangled together. The longer you run without a clean system, the more the two blur, and untangling them is one of the least fun tasks in a founder's life.

A nasty surprise before your next raise. Diligence for your next round will look at the books you kept from the start. "We'll clean it up before we fundraise" turns your busiest, highest-stakes month into a bookkeeping crisis. See How to answer investor due diligence →.

None of these show up as a line item, which is why late setup feels cheap. They show up as time, stress and a bigger accountant bill — always more than the software would have cost.

But not any software, and not a spreadsheet

Setting up early only helps if you set up something that actually reduces your work. A spreadsheet started on day one is better than nothing, but it won't reconcile against your bank, won't file your VAT, and will hide a broken formula for months. It's fine for the first fortnight and a liability after that.

The goal isn't just "start early" — it's "start early with a tool built for where you are." A funded startup needs different things from a sole trader: investor-ready reporting, SEIS/EIS record-keeping, runway visibility, and often access for more than one founder. What to weigh is the subject of the next article: What to look for in accounting software as a funded UK startup →.

The rule of thumb

Set up your accounting software the same week you open your business bank account — before the transactions start, not after they've piled up. For a startup that's just raised, that means now. The work is a couple of hours; the alternative is a couple of weeks of cleanup later, at someone else's hourly rate.

Early is cheap. Late is expensive and invisible until it isn't. Start clean while "clean" is still the default.

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The easiest way to start early is to start automatically. Connect your business account to Ledgers and it begins categorising and reconciling from your first transaction — no spreadsheet to outgrow, no history to reconstruct, VAT and payroll built in for when you need them. Set your books up in an afternoon → free to try.

Next in this guide: What to look for in accounting software as a funded UK startup →

Frequently asked questions

Do I need accounting software before I have revenue?

Usually yes. Once your company is spending money — on tools, contractors, salaries or equipment — you have transactions to record, and the easiest time to record them is as they happen. Pre-revenue isn't pre-transaction, and it's the spending that creates the bookkeeping.

Can't I just use a spreadsheet until we're bigger?

For the first few weeks, maybe. But a spreadsheet doesn't reconcile against your bank, isn't Making Tax Digital compatible, and hides errors silently. The moment you have a bank account and regular spending, a spreadsheet becomes a liability rather than a saving.

What's the real cost of setting up accounting software late?

Someone has to reconstruct the history — matching months of card payments to receipts you may no longer have, guessing at categories, and untangling personal and business spend. That reconstruction is billable accountant time, and it usually costs far more than a year of software would have.

See your numbers without learning accounting

Ledgers does the bookkeeping — bank feeds, VAT, year-end — and keeps your accountant in the loop. Free for pre-revenue founders.

Start free →

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