Chapter 15: VAT for Growing Businesses

Tax year notice: This guide uses 2025/26 tax year figures (6 April 2025 -- 5 April 2026). Check gov.uk for the latest rates.

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VAT as a cash flow exercise

Chapter 10 covered when and why to register for VAT. This chapter is about living with it -- the practical reality of charging, collecting, accounting for, and paying VAT as a growing business.

The most important mindset shift: VAT is not your money. When you charge a customer 120 (100 + 20 VAT), that 20 belongs to HMRC. You're holding it temporarily. The danger is spending it and then not having enough when the VAT return is due.

The simplest protection: open a separate savings account and transfer the estimated VAT liability from every sale immediately. When the quarterly return is due, the money is already set aside.

Filing a VAT return: Step by step

VAT returns are filed quarterly. Your accounting software does the heavy lifting -- you review and submit.

Before filing:

1. Reconcile your bank account -- make sure all transactions are recorded and categorised
2. Check that VAT has been correctly applied to sales (output VAT) and purchases (input VAT)
3. Review any unusual transactions -- are they at the right VAT rate?
4. Check for any missing supplier invoices (you need a valid VAT invoice to reclaim input VAT)

The 9-box return:

Your software calculates boxes 1--9 automatically from your transaction data. You review the numbers, confirm they look right, and submit digitally through MTD-compatible software.

Deadline: 1 month and 7 days after the end of the quarter. For a quarter ending 30 June, the return and payment are due by 7 August.

Key point: You must have a valid VAT invoice to reclaim input VAT. A till receipt usually isn't enough above 250 (though simplified VAT invoices are accepted for purchases under 250). Always get a proper invoice showing the supplier's VAT number, the VAT amount, and the VAT rate.

Partial exemption

If your business makes both taxable and exempt supplies, you can't reclaim all your input VAT -- only the portion related to taxable sales.

This is called partial exemption and mostly affects businesses in financial services, insurance, education, or healthcare. For Sam and Steve, everything they sell is standard-rated, so partial exemption doesn't apply.

If you do have exempt income, the calculation involves working out what percentage of your supplies are taxable and reclaiming that percentage of your input VAT. HMRC has specific methods for this calculation, and an accountant is strongly recommended.

Reverse charge VAT

The reverse charge is a mechanism where the buyer, not the seller, accounts for the VAT. You'll encounter it in two situations:

1. Services from abroad: If you buy services from a non-UK supplier (e.g., software subscriptions from the US, design services from the EU), you must account for VAT on those services yourself. You add the VAT to both your output tax (box 1) and your input tax (box 4) -- the effect is neutral if you can reclaim the VAT, but it must be reported.

2. Construction Industry Scheme (CIS): Certain construction services use a domestic reverse charge. If Steve subcontracts specialist work (tree surgery, landscaping design), this may apply.

Your accounting software typically handles reverse charge entries if you categorise the transaction correctly.

Imports and exports after Brexit

If Sam buys vintage clothing from EU suppliers or sells to EU customers, VAT gets more complex:

Importing goods from outside the UK (including EU):

• Import VAT is charged at the UK border (20% on the value of goods + shipping + duty)
• You can reclaim this import VAT on your next VAT return if you have the import documentation (C79 certificate or postponed VAT accounting statement)
• Postponed VAT Accounting (PVA): Instead of paying import VAT at the border and reclaiming it later, PVA lets you account for it on your VAT return directly. You declare it in both box 1 (output) and box 4 (input) -- no cash flow impact.

Exporting goods outside the UK:

• Exports to non-UK customers are zero-rated (0% VAT). You don't charge VAT but you can still reclaim input VAT on related purchases.
• You must keep proof of export (shipping documentation, tracking evidence).

Selling services to EU businesses:

• Generally outside the scope of UK VAT (the customer accounts for VAT in their own country under the reverse charge mechanism)
• You don't charge UK VAT but must still report the sale

Key point: If you're buying or selling internationally, get advice from an accountant or VAT specialist. The rules are complex and the penalties for getting them wrong are significant.

Common VAT mistakes

Mistake	Why it matters
Reclaiming VAT without a valid invoice	HMRC can deny the claim. A till receipt isn't enough above 250
Not registering on time	You owe VAT from the date you should have registered, not when you actually did
Charging VAT on exempt items	You can't charge VAT on exempt supplies, and doing so creates complications
Spending collected VAT	The 20% you collect isn't income -- it belongs to HMRC
Forgetting to adjust for credit notes	If you refund a customer, you need to adjust the VAT too
Missing the filing deadline	Penalties apply per late return, and interest accrues on late payment
Not using digital links (MTD for VAT)	Data must flow digitally between software without manual re-keying. Copy-pasting from spreadsheets to software is not compliant

Cash flow management for VAT

VAT creates a timing mismatch: you collect it from customers but don't pay it to HMRC until the quarterly return. This can work for or against you:

Cash flow benefit: You're holding HMRC's money interest-free for up to 4 months. On 200,000 turnover with 20% VAT, you're holding up to 40,000/year of HMRC's money at any given time. This is a free short-term loan.

Cash flow risk: If you've spent that money, the quarterly bill is a shock. At 200,000 turnover, you might owe 6,000--10,000 per quarter (depending on input VAT reclaimed).

Best practice: Transfer VAT from every sale into a separate account immediately. Treat it as untouchable. When the return is due, the money is there.

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Real Scenario: Sam's quarterly VAT return

Sam's Vintage Ltd -- VAT quarter ending 30 September:

Item	Amount
Total sales (excl. VAT)	30,000
VAT charged on sales (20%)	6,000
Total purchases (excl. VAT)	12,500
VAT on purchases	2,280

Sam's 9-box return:

Box	Description	Amount
1	VAT due on sales	6,000
2	VAT due on EU acquisitions	0
3	Total VAT due	6,000
4	VAT reclaimed on purchases	2,280
5	Net VAT to pay HMRC	3,720
6	Total sales excl. VAT	30,000
7	Total purchases excl. VAT	12,500
8	Total supplies to EU	0
9	Total acquisitions from EU	0

Sam pays 3,720 to HMRC by 7 November. Sam had already set aside 5,000 (rough estimate of VAT liability) in a separate account, so there's 1,280 left over -- a small buffer for the next quarter.

Real Scenario: Steve's first VAT return

Steve's gardening business crossed the 90,000 threshold and registered for VAT in January. His first VAT quarter:

Item	Amount
Total services billed (excl. VAT)	22,000
VAT charged (20%)	4,400
Purchases (materials, fuel, tools -- excl. VAT)	4,800
VAT on purchases	860

Steve pays HMRC: 4,400 - 860 = 3,540

Steve's service-based business has lower input VAT (fewer purchases) than Sam's product-based business. This means Steve pays a higher proportion of collected VAT to HMRC. Steve sets aside 18% of every invoice (slightly less than 20% because of reclaimable input VAT) as a rule of thumb.

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Checklist: Quarterly VAT return

• Reconcile your bank account for the quarter
• Check all sales have the correct VAT rate applied
• Ensure you have valid VAT invoices for all purchase claims above 250
• Review any international transactions (imports, exports, reverse charges)
• Check for credit notes or refunds that need VAT adjustment
• Review the 9-box summary in your software
• Submit the return digitally through MTD-compatible software
• Pay HMRC by the deadline (1 month and 7 days after quarter end)

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Jargon Buster

Term	Plain English
Output VAT	VAT you charge customers on your sales
Input VAT	VAT you pay on your business purchases
VAT invoice	A formal invoice showing the seller's VAT number, VAT rate, and VAT amount. Required to reclaim input VAT
Partial exemption	When a business makes both taxable and exempt supplies, and can only reclaim a portion of input VAT
Reverse charge	Where the buyer (not the seller) accounts for VAT. Used for services from abroad and some construction work
Postponed VAT Accounting (PVA)	Declaring import VAT on your return instead of paying it at the border -- no cash flow impact
Zero-rated	Taxable at 0% VAT -- you still report it but don't charge the customer
Digital links	MTD requirement that data flows between software systems without manual re-entry
C79 certificate	HMRC document proving you paid import VAT at the border, needed to reclaim it