How to complete a UK VAT return: the 9-box walkthrough

Every VAT-registered UK business must submit a VAT return for each tax period, typically quarterly, using MTD-compatible software. The return has nine boxes, and the figures in those boxes must be calculated correctly before submission. HMRC does not allow a manual paper return or a direct spreadsheet upload for most businesses: you need functional compatible software that pulls data from your digital records and pushes the return to HMRC via their API. This guide walks through every box, shows a worked example with real figures, and covers deadlines, the MTD submission workflow, and what to do if you spot an error after submitting.

What a VAT return is

A VAT return is the form VAT-registered businesses use to report output tax (VAT charged on sales) and input tax (VAT paid on purchases) for each accounting period. The net of those two figures is either payable to HMRC or reclaimable from them.

Key points before you start:

• Most businesses file quarterly, but monthly and annual accounting are available in certain cases.
• You must submit a return for every period, even if the net VAT figure is zero or if HMRC owes you a repayment.
• The deadline for both submission and payment is 1 calendar month and 7 days after the end of your VAT accounting period.
• All VAT-registered businesses have been required to use MTD-compatible software since April 2022, regardless of turnover size.
• The legal basis for the return obligation is VATA 1994 s.25; the deadline is set by reg.40 of SI 1995/2518 (Value Added Tax Regulations 1995).

MTD for VAT: what it means in practice

Making Tax Digital for VAT imposes three connected obligations on every VAT-registered business.

1. Digital records

You must keep certain data in digital form. At a minimum, your records must capture: your VAT registration number; the time and description of each supply; the nature of the supply (goods or services); the value of the supply excluding VAT; and the rate and amount of VAT charged. These records must live in a functional compatible software product, or in a chain of digitally linked tools that feed into one.

2. Digital links

Where data moves between software tools, it must do so via a digital link. A digital link is any electronic transfer of data between two programs or products: a formula pulling figures from one spreadsheet cell to another counts; a macro export counts; copy-and-paste does not count and is not permitted. If you work primarily in spreadsheets, you must use bridging software that creates a valid digital link between your spreadsheet and HMRC's API. Simply emailing yourself a spreadsheet and rekeying the totals into another system is not compliant.

3. API submission

The nine box figures must be submitted directly to HMRC via HMRC's API. Compatible accounting software handles this automatically: you review the nine boxes the software has populated and click submit. Your accountant can do the same using agent credentials via their own MTD-compatible software, though you remain responsible for the accuracy of the figures.

MTD exemptions exist but are narrow. They cover genuine digital exclusion due to disability, age or religious belief, and certain insolvency situations. The vast majority of VAT-registered businesses must comply.

For the software itself: use dedicated accounting software (Xero, QuickBooks, Sage and many others are all MTD-compatible) or bridging software for spreadsheet users. HMRC maintains an approved-software list at gov.uk; check it before choosing a product.

The 9 boxes: what goes in each one

The definitions below are verified against the live gov.uk guidance for VAT Notice 700/12 ("How to fill in and submit your VAT Return"), fetched 2026-07-09 at https://www.gov.uk/guidance/how-to-fill-in-and-submit-your-vat-return-vat-notice-70012.

Box	Label	What to include
1	VAT due in the period on sales and other outputs	Output VAT charged on all taxable supplies in the period: standard-rated (20%) and reduced-rated (5%) sales. Also include import VAT on goods accounted for under postponed VAT accounting, private fuel scale charges, capital asset sales, and staff supplies. Do not include exempt supplies.
2	VAT due in the period on acquisitions of goods made in Northern Ireland from EU member states	Applies only to businesses moving goods into Northern Ireland from EU member states under the Northern Ireland Protocol. Include VAT on those acquisitions and related costs such as transport and insurance. Businesses based entirely in Great Britain enter 0.
3	Total VAT due	Calculated field: Box 1 plus Box 2. This is your total output VAT for the period.
4	VAT reclaimed in the period on purchases and other inputs (including acquisitions from the EU)	Total input VAT you can recover: VAT on business purchases, expenses, assets and imports (including postponed import VAT and NI-protocol acquisition VAT). Must be supported by valid VAT invoices. Exclude VAT on personal use, most business entertainment, and other blocked items.
5	Net VAT to pay to HMRC or reclaim	Calculated field: Box 3 minus Box 4. A positive figure means you owe that amount to HMRC. A negative figure means HMRC owes you a repayment.
6	Total value of sales and all other outputs excluding any VAT	The VAT-exclusive value of ALL outputs in the period: standard-rated, reduced-rated, zero-rated, and exempt supplies. Include zero-rated exports. Also include Northern Ireland dispatches to EU member states (NI Protocol businesses). Do not include VAT itself. This is the "turnover" figure HMRC uses for error-threshold calculations.
7	Total value of purchases and all other inputs excluding any VAT	The VAT-exclusive value of all business purchases and expenses, including imports and NI-protocol acquisitions. Do not include VAT itself. Exclude wages, PAYE and personal drawings.
8	Total value of all supplies of goods and related costs, excluding any VAT, to EU member states	NI Protocol businesses only: the value of goods dispatched from Northern Ireland to EU member states, including related freight and insurance costs. Exclude separately invoiced services. Businesses based entirely in Great Britain enter 0.
9	Total value of all acquisitions of goods and related costs, excluding any VAT, from EU member states	NI Protocol businesses only: the value of goods acquired in Northern Ireland from VAT-registered EU suppliers, including related freight costs. Exclude separately invoiced services. Businesses based entirely in Great Britain enter 0.

Boxes 8 and 9 post-Brexit: a note for GB businesses

Since 1 January 2021, goods traded between Great Britain (England, Scotland and Wales) and the EU are treated as imports and exports under customs rules, not as intra-EU acquisitions or dispatches. Boxes 8 and 9 are therefore only relevant to businesses that move goods between Northern Ireland and EU member states under the Northern Ireland Protocol. A business trading entirely from Great Britain should enter 0 in both boxes.

Partial exemption: a brief alert

Where a business makes both taxable and exempt supplies, the input VAT in Box 4 must be restricted to the recoverable portion. A partial exemption calculation is required (using the standard method or a special method agreed with HMRC). This page does not cover partial exemption in depth; if it applies to your business, take specialist advice before completing Box 4.

Worked example: Standard Widgets Ltd

Standard Widgets Ltd is a small manufacturing business registered in England. Its quarterly VAT period runs from 1 January to 31 March 2026. It sells standard-rated widgets to UK customers, makes zero-rated exports to a customer in Germany, and also acquires a quantity of goods from a supplier in Ireland via its small Northern Ireland warehouse (which brings the Northern Ireland Protocol into play for those goods only).

Its transactions for the quarter are as follows:

Transaction	Net (excluding VAT)	VAT
UK standard-rated widget sales	£80,000	£16,000
Zero-rated exports to Germany	£12,000	£0
Goods acquired from Ireland via NI warehouse (NI Protocol)	£5,000	£1,000 (acquisition VAT)
UK standard-rated purchases and costs	£30,000	£6,000
Capital equipment purchase (standard-rated)	£10,000	£2,000

Here is how the VAT return boxes are filled:

• Box 1: £16,000 (output VAT on UK sales) plus £1,000 (acquisition VAT on NI-Protocol goods, declared here as output tax) = £17,000
• Box 2: £1,000 (acquisition VAT on goods brought into Northern Ireland from Ireland) = £1,000
• Box 3: £17,000 plus £1,000 = £18,000
• Box 4: £6,000 (input VAT on purchases) plus £2,000 (input VAT on capital equipment) plus £1,000 (acquisition VAT reclaimed, matching Box 2) = £9,000
• Box 5: £18,000 minus £9,000 = £9,000 payable to HMRC
• Box 6: £80,000 (UK sales) plus £12,000 (zero-rated exports to Germany) = £92,000. The £5,000 NI acquisition is not a sale; it goes in Box 9, not Box 6.
• Box 7: £30,000 (purchases) plus £10,000 (capital equipment) plus £5,000 (net value of NI acquisition) = £45,000
• Box 8: £0 (no goods dispatched from NI to EU member states this period)
• Box 9: £5,000 (net value of goods acquired in NI from Ireland) = £5,000

Three teaching points from this example:

First, zero-rated exports inflate Box 6 but not Box 1. The German sales go into Box 6 as part of total outputs, but because they are zero-rated there is no VAT in Box 1 for them. This is a common source of confusion: a business with large export volumes will have a high Box 6 relative to Box 1, which is correct.

Second, the NI-protocol acquisition touches four boxes. The acquisition VAT of £1,000 appears as output in Box 1, as a separate figure in Box 2, as recoverable input in Box 4, and the net value of £5,000 goes into Box 7 as a purchase and into Box 9 as an acquisition from the EU. Box 2 and Box 9 are only active because of the NI warehouse.

Third, Box 5 is the only figure that results in a payment or repayment. Everything else is informational. Standard Widgets Ltd owes HMRC £9,000 for the quarter.

Deadlines and payment

The VAT return deadline and the payment deadline are the same date: 1 calendar month and 7 days after the end of your VAT accounting period. For a quarter ending 31 March 2026, that means both the return submission and payment must reach HMRC by 7 May 2026.

HMRC checks submission and payment independently. Filing on time but paying late still generates a late-payment interest charge. Paying on time but filing late still earns a penalty point.

Payment options:

• Direct Debit: If you have a Direct Debit mandate set up with HMRC for VAT, payment is collected automatically approximately 3 working days after the filing deadline. You still need to submit your return on time; if you file late, the Direct Debit collection will not proceed.
• Faster Payments or CHAPS: Bank transfer direct to HMRC's bank account. Allow time for the payment to clear; same-day Faster Payments typically clear in hours, but CHAPS processing windows vary.
• Your VAT online account: Pay via your HMRC online account using a debit or corporate credit card (personal credit cards are not accepted by HMRC for tax payments).

Late submission and payment consequences: HMRC operates a points-based penalty system for VAT from January 2023, replacing the old default surcharge. A late return earns one penalty point. Quarterly filers who accumulate four points trigger a fixed £200 penalty, plus a further £200 for every subsequent late submission. Late payment interest applies from the day after the deadline at HMRC's rate (Bank of England base rate plus 2.5%).

How to submit via MTD software

The practical submission process is straightforward once your software is connected to HMRC. Here is the sequence:

Step 1: Connect your software. If you have not already done so, authorise your accounting or bridging software to connect to HMRC's VAT service via your VAT online account. This is a one-time setup. Your accountant can do it through their Agent Services Account if they file on your behalf.

Step 2: Run your VAT report at period end. At the close of your VAT accounting period, run the VAT return report in your software. The software reads your digital records and populates the nine boxes.

Step 3: Review the boxes. Cross-check Box 6 (total outputs excluding VAT) against your sales records to confirm no transactions have been omitted. Verify that Box 3 equals Box 1 plus Box 2, and that Box 5 equals Box 3 minus Box 4. Your software calculates these automatically, but it is worth confirming the arithmetic visually.

Step 4: Add postponed import VAT if applicable. If you import goods using postponed VAT accounting, download your monthly postponed import VAT statements from the HMRC customs portal and check that the figures have been included in Box 1 and Box 4. Some accounting software pulls these automatically; others require a manual entry or import.

Step 5: Submit. Click submit within your software. The software sends the nine figures to HMRC via the API. You receive a confirmation reference number on screen. Save or screenshot this; it is your evidence of on-time filing if there is ever a dispute.

Step 6: Pay. Pay the Box 5 amount by the same deadline. If you have a Direct Debit mandate, no separate action is needed beyond ensuring your return was filed on time.

If your accountant submits on your behalf, they do so using their own MTD-compatible software under their Agent Services Account. You remain responsible for the accuracy of the underlying figures.

Common errors and how to correct them

Five errors that appear most often

1. Including VAT in Box 6 or Box 7. Both boxes require VAT-exclusive figures. A common mistake is including the gross (VAT-inclusive) sale or purchase value. Box 6 and Box 7 are net-of-VAT only.

2. Omitting zero-rated supplies from Box 6. Zero-rated exports and UK zero-rated sales carry no VAT, so nothing goes into Box 1 for them. But they are still outputs and must be included in Box 6. A business with large zero-rated turnover that forgets this will understate Box 6, which can cause issues with HMRC's error-threshold calculations.

3. Missing postponed import VAT. If you import goods using postponed VAT accounting, the import VAT must be declared in Box 1 (as output tax) and reclaimed in Box 4 (as input tax). The figures come from your monthly postponed import VAT statement, which must be downloaded from HMRC's customs portal. If you forget to pull the statement, both Box 1 and Box 4 will be understated.

4. Claiming input VAT on blocked items. Business entertainment costs are blocked; you cannot recover input VAT on them. Most car purchases are also blocked unless the car is used exclusively for business with no private use. Staff-only events may qualify but require care. If in doubt, check HMRC's input tax rules before claiming.

5. Construction reverse charge omissions. If your business receives construction services that fall under the domestic reverse charge, you must account for both the output VAT (in Box 1) and the input VAT (in Box 4). Not entering anything in Box 1 for these services is incorrect. See the detailed guide: domestic reverse charge for construction.

Correcting a VAT error after submission

You cannot amend a submitted VAT return. Corrections are made either through an adjustment on your next return or by notifying HMRC separately using form VAT652, depending on the size and nature of the error.

HMRC's rules set out thresholds that determine which route applies. The key variables are the net value of the error (the total of underdeclared and overdeclared VAT across the period, netted off) and how that net value compares to your Box 6 turnover for the return period. Check the current thresholds on gov.uk (search for "correct VAT errors 700/45") before deciding how to proceed, as the figures may be updated.

As a general structure: small errors below both a fixed net value ceiling and a percentage of Box 6 turnover can be included as a correcting adjustment in your next return. Errors that exceed either test require a separate disclosure to HMRC, and the largest errors require disclosure regardless of Box 6 turnover. Deliberate errors must always be reported separately, regardless of amount.

VAT652 is the form for separate disclosure. Download it from gov.uk, complete it with details of the original error and the corrected figures, and post it to HMRC's VAT Error Correction Team. Voluntary disclosure before HMRC identifies the error can reduce penalties under the unprompted-disclosure regime.

For guidance on the import VAT side of error correction, see: import VAT and postponed VAT accounting.

The flat-rate scheme: a different approach

Businesses using the Flat Rate Scheme (FRS) do not complete the nine boxes in the standard way. Instead of calculating input and output VAT separately, they apply a flat-rate percentage to their VAT-inclusive turnover and pay that amount to HMRC. Box 6 is still completed, using flat-rate scheme rules. The return is submitted via MTD software by the same deadline.

You can join the FRS if your expected taxable turnover (excluding VAT) is £150,000 or less. However, if you are a limited cost business (goods cost under 2% of turnover, or under £1,000 a year), your flat rate is 16.5%, which usually makes the scheme unattractive for service businesses and contractors.

For a full comparison: flat-rate VAT vs standard VAT.

When to get professional help

The standard nine-box return is manageable for most fully taxable businesses using good accounting software. The calculation becomes more complex if your business makes both taxable and exempt supplies (partial exemption applies), has significant import or export activity, operates in the construction sector under the domestic reverse charge, or has received a VAT inspection letter or HMRC query. In those situations, an accountant who handles VAT compliance can review your figures, file on your behalf via agent access, and deal with HMRC directly if questions arise. What a VAT accountant does.