The VAT quarter that had already been spent

There is a version of a cash crisis that does not involve a single mistake. Sales grow. Customers pay. The bank balance goes up. The business, quite reasonably, spends some of it on the things a growing business needs — more stock, a second van, an extra pair of hands. Then the VAT return is prepared and the number at the bottom is larger than anything left in the account.

This is the most common financial failure in a healthy small business, and it is not really an accounting problem. It is a mental accounting problem: money that arrives in your bank account feels like your money, and roughly a sixth of a VAT-inclusive receipt never is.

The money was never yours

A VAT-registered business is an unpaid collection agent. You add 20% to your prices, the customer pays it, and you hold it until the quarterly return falls due, one month and seven days after the quarter end. What you hand over is the VAT you charged less the VAT you were charged on business purchases.

Everything about the mechanics encourages the illusion that it is income. It arrives in the same account as your sales, on the same invoices, from the same customers, and it inflates every headline number you look at day to day. Nothing in the ordinary rhythm of running a business flags that a fifth of the balance is spoken for.

Growth makes it worse, not better

This is the cruel part, and the reason it catches good businesses rather than failing ones.

A business turning over £110,000 of standard-rated sales in a quarter, with £74,000 of VAT-bearing costs, owes roughly £22,000 less £14,800, so about £7,200. Grow the same business by half — £165,000 of sales, £111,000 of costs — and the bill becomes about £10,800. The VAT liability scales with turnover, but the cash to pay it was consumed by the very growth that produced it: bigger stock orders, more wages, longer debtor days.

So the quarter where trading is best is the quarter where the bill is biggest and the bank is emptiest, and if the business has also just spent on something capital, the timing is fatal. The difference between cash flow and profit explains the theory of this. VAT is where most owners meet it in person.

A growing business does not run out of money because it is failing. It runs out because growth consumes cash faster than profit produces it — and VAT is the bill that arrives at exactly the wrong moment.

What it costs to get this wrong

The penalty regime is unsympathetic to good intentions. If VAT is paid 16 or more days late, a first late payment penalty of 3% of the outstanding tax applies. If it is still unpaid at day 31, that first penalty increases by a further 3% of what was outstanding at day 30, and a second penalty starts accruing daily at an annualised rate of 10%. On top of that, late payment interest runs at the Bank of England base rate plus four percentage points — 7.75% since 9 January 2026.

Filing late is charged separately under a points system: a point for each late return, and once a quarterly filer reaches four points, a £200 penalty for that return and £200 for each subsequent late one.

On a £10,800 bill left unpaid for two months, that is roughly £650 in penalties before the daily second penalty and interest are counted — money spent on nothing at all.

The fix is mechanical, not moral

The businesses that never have this problem are not more disciplined. They have simply removed the decision.

Open a second bank account, ideally one that is mildly inconvenient to move money out of, and sweep VAT into it weekly. Weekly rather than monthly, because thirteen small transfers survive a bad week in a way one large transfer does not. On £110,000 of quarterly standard-rated sales, that is about £1,415 a week if you sweep the full output VAT, and you settle up against your input VAT at the return.

A simpler rule that suits businesses with few reclaimable costs: sweep one sixth of every payment received, since VAT is one sixth of a VAT-inclusive amount. Do it as a standing order set for the day after your main takings land, not on the 1st.

Two HMRC schemes also help by changing the timing rather than the amount. The cash accounting scheme, open to businesses with VAT taxable turnover of £1.35 million or less, means you account for VAT when your customers pay you rather than when you invoice them — which removes the specific misery of paying VAT on an invoice a customer has not settled. That single change is worth more than most credit control advice to a business with slow-paying clients, though it works alongside rather than instead of chasing invoices properly. The annual accounting scheme, available at the same turnover limit, replaces four returns with one and spreads payment across regular advance instalments, turning a quarterly shock into a monthly cost.

If the bill has already landed and the money is gone

Deal with it in the first fortnight, not the second month. HMRC will spread VAT debts, and the online self-serve route is open to businesses owing £100,000 or less that have filed their returns and have no other arrangements — though not to businesses on cash accounting, annual accounting or payments on account. Agreeing a Time to Pay arrangement can mean lower or no late payment penalties, and what a Time to Pay arrangement actually involves is worth understanding before you ring.

Whatever you do, file the return on time even if you cannot pay it. Filing and paying are penalised separately, and there is nothing to gain from collecting a submission point on top of a payment problem.

Then fix the mechanism the same week the panic subsides. The second account and the standing order take fifteen minutes to set up, and the reason to do it immediately is that the sensation of nearly having got caught fades far faster than the habit that caused it.

Common questions

Is the VAT I collect actually my money?

No. VAT charged to customers is collected on HMRC's behalf, and the business is effectively an unpaid collection agent holding it until the return falls due — one month and seven days after the end of the VAT quarter. What you pay over is the VAT charged on sales less the VAT charged to you on business purchases. The practical difficulty is that it arrives in the same bank account as genuine income, on the same invoices, from the same customers, so nothing in the day-to-day running of the business signals that roughly a sixth of a VAT-inclusive receipt is not available to spend.

How much should I set aside for VAT each week?

The simplest reliable rule is to sweep one sixth of every VAT-inclusive payment you receive into a separate account, because VAT is one sixth of a VAT-inclusive amount. You will over-collect slightly, since you reclaim VAT on purchases, and that surplus becomes a buffer for the quarter you have a bad month. A business with £110,000 of standard-rated quarterly sales sweeping full output VAT would move about £1,415 a week. Do it weekly rather than monthly, by standing order, timed for the day after your main receipts land rather than the first of the month.

What happens if I cannot pay my VAT bill on time?

A first late payment penalty of 3% of the outstanding VAT applies once payment is 16 or more days late, increasing by a further 3% of the balance outstanding at day 30 once you reach day 31, when a second penalty also begins accruing daily at an annualised 10%. Late payment interest runs at base rate plus four percentage points, 7.75% since 9 January 2026. Contact HMRC in the first fortnight: agreeing a Time to Pay arrangement can mean lower or no late payment penalties, and the online route covers VAT debts of £100,000 or less where returns are filed.

Would the cash accounting scheme solve this?

It helps significantly if your problem is paying VAT on invoices customers have not yet settled. Under the cash accounting scheme, open to businesses with VAT taxable turnover of £1.35 million or less, you account for VAT when your customers pay you and reclaim it when you pay suppliers. It suits businesses with long debtor days and few large purchases. It suits you less well if you regularly reclaim more VAT than you charge, since your reclaims are also delayed. The annual accounting scheme is the alternative fix, spreading payment into regular instalments with one return a year.