Cash Accounting vs Standard VAT: Which Should Your Business Use?

These two schemes don't change how much VAT you owe over the life of the business. They change when it's due. For a business that invoices on 30-day terms and gets paid on 60, that timing difference is a genuine cash flow decision, not a technicality.

Standard (accrual) VAT: due on the invoice, not the payment

Under standard VAT accounting, output VAT is due in the return period covering the date you issue your sales invoice, regardless of when (or whether) your customer actually pays it. Input VAT works the same way in reverse: you reclaim it when you receive a supplier invoice, whether or not you've paid it yet.

This is the default for every VAT-registered business unless you actively elect into cash accounting or flat rate. It's simple to reconcile against your sales ledger, but it means you can end up paying HMRC VAT on money you haven't collected yet.

Cash accounting: VAT follows the money

Under the cash accounting scheme, output VAT is only due once your customer actually pays you, and input VAT can only be reclaimed once you've actually paid your supplier. Everything shifts from invoice date to payment date.

To join, your estimated VAT-exclusive taxable turnover must be £1.35 million or less for the next 12 months. You can stay on the scheme until turnover exceeds £1.6 million, at which point you must leave (though you can carry on to the end of the VAT period in which you exceeded it).

Under standard VAT, that £4,000 has to be found and paid to HMRC by 7 May, five days before the customer has even paid the invoice it relates to. Under cash accounting, it isn't due until the return covering the quarter the payment actually landed.

The built-in bad debt protection

Cash accounting has a quieter benefit: if a customer never pays at all, you never have to account for VAT on that invoice in the first place, because the trigger for VAT ever being due (payment) never happens. Under standard VAT, you're on the hook for output VAT on every issued invoice, and only get it back through a formal bad debt relief claim, which you can only make once the debt is over six months old and has been written off in your accounts. Cash accounting sidesteps that process entirely for genuinely bad debts.

The catch: it slows your input VAT reclaims too

The same payment-timing rule applies to what you owe suppliers. If you take 60 or 90 days to pay your own bills, cash accounting delays when you can reclaim the input VAT on them: you're trading a benefit on the sales side for a cost on the purchase side.

How to actually switch

There's no formal application to join cash accounting: you simply start using it from the beginning of a VAT period, provided you meet the turnover test, and note the change in your records. Leaving works the same way in reverse. It's worth reviewing the decision whenever your typical customer or supplier payment terms shift materially, not just at registration.

Which one fits your business

If your customers pay slowly and your suppliers get paid quickly, cash accounting is very likely worth adopting. If it's the other way round, or your turnover is approaching £1.6 million, standard VAT is probably still the better fit, and worth revisiting again as the business grows past the cash accounting threshold regardless.