Can I join cash accounting partway through a VAT period?

You can join at the start of any VAT accounting period. You cannot join partway through a period. Before joining, account for all outstanding VAT under your previous method to create a clean cut-off.

Does cash accounting affect how I fill in my VAT return?

Yes. Under cash accounting, Box 1 shows output VAT on sales payments actually received, not invoices issued. Box 4 shows input VAT on purchases you have actually paid. The boxes are completed on a cash-received and cash-paid basis rather than invoice date basis.

What quarterly VAT payment can I estimate under cash accounting?

Your quarterly net VAT is broadly: (annual output VAT minus annual input VAT) divided by 4. Because payments lag invoices, your actual quarterly payment may vary, but over a year the total equals standard accounting. The calculator above shows the estimated quarterly net payment.

What if my debtor days are longer than my creditor days?

If customers take longer to pay you (long debtor days) than you take to pay suppliers (short creditor days), the Cash Accounting Scheme provides maximum cashflow benefit. The timing gap between receiving money and paying it out is greatest in this scenario.

Does cash accounting apply to all VAT transactions?

Not all transactions qualify. Imports, exports, and certain supplies outside the scheme rules may need to be handled differently. Most standard B2B and B2C sales and purchase transactions within the UK can be included in cash accounting.

How does HMRC verify cash accounting compliance?

HMRC may inspect your business records during a VAT visit. They will check that VAT was reported based on actual payment dates and not invoice dates. Good record-keeping with dated receipts and bank statements is essential to pass inspection.

VAT Cash Accounting Scheme Calculator 2025/26

VAT Cash Accounting Cashflow Benefit Calculator

Annual VAT-exclusive turnover (£)

Average debtor days (days to pay you)

Average creditor days (days you pay suppliers)

Annual VAT on sales (output tax £)

Annual VAT on purchases (input tax £)

Eligible for cash accounting?

Estimated cashflow benefit (VAT float)

Approximate annual interest saving

Estimated quarterly net VAT payment

Annual output VAT deferred timing benefit

Annual input VAT timing difference

Eligibility: join if turnover ≤ £1,350,000; must leave if exceeds £1,600,000. Calculator is for guidance only.

What Is the VAT Cash Accounting Scheme?

The VAT Cash Accounting Scheme is an HMRC arrangement that changes when you account for VAT. Under standard VAT accounting, you record output VAT (VAT on your sales) when you issue an invoice, even if your customer has not yet paid. Similarly, you reclaim input VAT when you receive a purchase invoice, not when you actually pay it.

Cash accounting reverses this. You declare output VAT only when your customer pays you. You reclaim input VAT only when you pay your supplier. This aligns your VAT obligations more closely with your actual cash position, which can be a significant working capital benefit for businesses with slow-paying customers.

The joining threshold for 2025/26 is £1,350,000 annual taxable turnover (net of VAT). The exit threshold is £1,600,000. You can join at the start of any VAT accounting period.

How to Calculate the Cashflow Benefit

The cashflow benefit is the amount of output VAT you hold on behalf of HMRC at any given time. If customers take 45 days to pay and your annual output VAT is £60,000, the approximate float is: £60,000 × 45 / 365 = £7,397. This is money you would otherwise need to fund from an overdraft under standard accounting.

The interest saving is this float multiplied by your cost of borrowing. At a 5% overdraft rate, the saving on £7,397 is approximately £370 per year — not transformative, but meaningful for cashflow-constrained small businesses. The real prize is protection against bad debts and the simplicity of matching VAT to cash.

Advantages of the Cash Accounting Scheme

Automatic bad debt protection — if a customer never pays, you never pay that VAT to HMRC
Improved cashflow — output VAT is not due until you receive payment
Simpler reconciliation with bank statements for small businesses
No separate bad debt relief claims required

Disadvantages to Consider

If you pay suppliers quickly, you delay input VAT recovery versus standard accounting
More complex record-keeping — every transaction must record the payment date
Cannot be combined with the Flat Rate Scheme
Leaving the scheme requires accounting for all outstanding VAT

Frequently Asked Questions

The VAT Cash Accounting Scheme lets you account for VAT on the basis of payments received and made, rather than tax invoices issued and received. You pay output VAT to HMRC only when your customer actually pays you, and reclaim input VAT only when you have paid your supplier.

You can join the Cash Accounting Scheme if your estimated VAT-taxable turnover (net of VAT) for the next 12 months is £1,350,000 or less. You must leave the scheme if your VAT-exclusive turnover exceeds £1,600,000 in any rolling 12-month period.

The joining threshold is £1,350,000 net (excluding VAT) per year. If you exceed the £1,600,000 exit threshold, you must leave within 6 months and account for all outstanding VAT immediately.

The cashflow benefit comes from delaying output VAT payment until you are actually paid. For example, if customers take 45 days to pay and your annual output VAT is £60,000, you typically hold approximately £7,400 of HMRC VAT money in your account at any time — a working capital benefit.

Yes. Under cash accounting, if a customer never pays you, you never pay HMRC the output VAT. Under standard VAT, you pay VAT on the invoice date and must then separately claim bad debt relief (after 6 months). Cash accounting gives automatic bad debt protection.

Yes. A newly VAT-registered business can join the Cash Accounting Scheme from the start of its registration, provided expected taxable turnover does not exceed the £1,350,000 threshold.

Standard VAT may be better if you receive payment quickly from customers but take a long time to pay suppliers. In that case, you can reclaim input VAT earlier under standard accounting, while delaying output VAT via cash accounting provides less benefit.

Estimate the average VAT amount you defer by multiplying output VAT by debtor days divided by 365. Then multiply this float by your overdraft interest rate (commonly around 5%). This gives your approximate annual interest saving from not borrowing to pay VAT early.

No. The VAT Flat Rate Scheme and Cash Accounting Scheme cannot be used together. The Flat Rate Scheme has its own basis of accounting, and HMRC rules prohibit combining them.

You must keep records of when each payment was received from customers and when you made payments to suppliers. Bank statements, payment receipts, and a cash book are the most practical approach. Your VAT records must clearly show the payment dates.

You can leave voluntarily at the end of any VAT accounting period. You must leave if your turnover exceeds £1,600,000. When leaving, you must account for all outstanding VAT on invoices already issued but not yet paid, either immediately or spread over 6 months by agreement with HMRC.

Cash accounting does not permanently save VAT — the total VAT paid over time is the same. The benefit is purely a timing and cashflow advantage: you keep the VAT money longer before paying HMRC, reducing your need for an overdraft or working capital financing.