How to Complete a VAT Return: A Guide for UK Businesses

For many business owners, submitting a VAT return is just another compliance task. In practice, it’s one of the most important recurring financial events your business faces.

Handled well, VAT is predictable and manageable. Handled poorly, it can disrupt cash flow, create unnecessary pressure, and lead to avoidable penalties.

This guide explains how VAT returns work in the UK, what HMRC expects, and how to approach the process with clarity and confidence, while keeping your wider financial position in mind.

What Is a VAT Return?

A VAT return is a report submitted to HMRC summarising:

• The VAT you’ve charged customers (output VAT)
• The VAT you’ve paid on business purchases (input VAT)
• The difference between the two

If you’ve charged more than you’ve paid, you owe HMRC the balance. If you’ve paid more than you’ve charged, you can reclaim the difference. Even if there is nothing to pay or reclaim, VAT-registered businesses must still submit a return.

It’s also worth noting that a VAT return is separate from your annual tax return. It focuses solely on VAT activity within a specific accounting period.

VAT Registration and Deadlines

The current VAT registration threshold is £90,000 (from 1 April 2024). You must register if:

• Your taxable turnover exceeds this threshold over a rolling 12-month period
• You expect to exceed it within the next 30 days

You may be able to deregister if turnover falls below £88,000.

Once registered, you’re required to:

• Charge VAT on taxable goods and services
• Keep digital VAT records
• Submit returns using Making Tax Digital (MTD) compatible software
  

VAT Return Deadlines

Most businesses submit VAT returns quarterly.

The deadline is one calendar month and seven days after the end of your accounting period. This is also the deadline for payment.

Missing deadlines can result in penalty points, fines, and interest charges.

HMRC’s Points-Based Penalty System

HMRC operates a points-based penalty system for late VAT returns.

• You receive a penalty point for each late submission
• Once a threshold is reached, a financial penalty applies
• Late payments may also incur interest

For growing businesses, avoiding penalties isn’t just about compliance, it helps protect working capital and maintain financial stability.

What You Need Before Submitting Your VAT Return

Strong preparation makes VAT returns significantly easier to manage.

Before submitting, ensure you have:

• Complete sales and purchase records
• Valid VAT invoices for all reclaims
• Correct VAT rates applied (20%, 5%, or 0%)
• Reconciled accounting software (e.g. Xero, Sage, QuickBooks)
• A reviewed VAT control account

Under Making Tax Digital, digital record-keeping is essential, but regular reconciliation throughout the quarter is what prevents surprises.

From a cash flow management perspective, it’s equally important to ensure funds are set aside to meet any VAT liability.

How to Complete a VAT Return

For most businesses, calculating VAT follows a simple structure:

1. Add up output VAT (VAT charged on sales)
2. Add up input VAT (VAT paid on business purchases)
3. Subtract input VAT from output VAT

If the result is positive, you pay HMRC. If negative, you reclaim the balance.

Understanding the 9 VAT Return Boxes

Behind the scenes, your software completes nine VAT return boxes:

1. VAT due on sales
2. VAT due on acquisitions (if applicable)
3. Total VAT due
4. VAT reclaimed
5. Net VAT to pay or reclaim
6. Total sales (excl. VAT)
7. Total purchases (excl. VAT)
8. EU sales (if applicable)
9. EU purchases (if applicable)

Understanding these figures helps you sense-check your VAT return before submission and reduce the risk of errors.

Tips for Submitting an Accurate VAT Return

Accuracy is key to avoiding penalties and maintaining control.

Practical steps include:

• Reconciling VAT monthly rather than quarterly
• Review large or unusual transactions
• Double-checking VAT rates and treatment
• Ensuring all invoices are valid and complete
• Submitting ahead of the deadline where possible

If errors are identified after submission:

• Smaller errors can often be corrected in your next return
• Larger errors must be reported directly to HMRC

Common VAT Return Challenges (and How to Avoid Them)

Incorrect VAT Rates

Misclassification can lead to under- or over-reporting.

Reverse Charge Errors

In sectors such as construction, VAT may be accounted for by the customer rather than the supplier. Reporting mistakes here are common.

Partial Exemption

If your business makes both taxable and VAT-exempt supplies, you may not be able to reclaim all input VAT. This often applies in property and finance-related businesses.

Missed Deadlines

Now automatically tracked under HMRC’s penalty system.

Across all of these, the common factor is visibility. Regular review reduces risk.

Additional VAT Considerations

VAT Schemes

Depending on your business, different VAT schemes may be worth considering:

• Cash Accounting Scheme: Pay VAT when customers pay you
• Annual Accounting Scheme: One return per year with advance payments
• Flat Rate Scheme: Simplified VAT as a fixed percentage of turnover

Each scheme affects cash flow differently, so it’s important to review suitability as your business evolves.

Postponed VAT Accounting

If you import goods, this allows you to declare and reclaim import VAT on the same return, helping with short-term cash flow.

Bad Debt Relief

If a customer hasn’t paid after six months, you may be able to reclaim the VAT already paid on that invoice.

Managing VAT Without Disrupting Cash Flow

While VAT calculations are relatively straightforward, the cash impact can be significant.

Without forward planning, VAT payments can:

• Restrict day-to-day operations
• Delay investment decisions
• Put pressure on working capital

At Charles & Dean, we support businesses in taking a more structured view of VAT within their wider cash flow strategy. That may involve planning ahead for upcoming liabilities or exploring funding options to reduce pressure during periods of growth.

Charles & Dean is not a financial adviser. Funding is subject to status and approval.

Finance Options for VAT

Even with strong planning, VAT payments can place pressure on cash flow, particularly during periods of growth, seasonality, or when large invoices have yet to be paid. In these situations, businesses may look to finance solutions that help spread the cost or unlock funds tied up in VAT.

VAT Loans
A VAT loan allows you to spread the cost of your VAT bill over an agreed term, rather than paying HMRC in a single lump sum. This can help preserve working capital, maintain operational stability, and avoid dipping into reserves at key moments in your business cycle. Repayments are typically fixed, making it easier to forecast and manage cash flow alongside other commitments.

Instant VAT Refunds
For businesses in a reclaim position, waiting for HMRC to process a refund can delay access to funds that could otherwise be reinvested. Instant VAT refunding provides early access to that reclaim, effectively bridging the gap between submission and payment. This can be particularly useful for businesses with regular VAT reclaims or those managing tight cash flow cycles.

Both options are designed to give you more control over timing, allowing VAT to fit around your business, rather than disrupting it.

VAT Return FAQs

Q: “How often do I need to submit a VAT return?”
A: Most businesses submit quarterly.

Q: “Do I need to submit a return if I owe nothing?”
A: Yes. Submission is mandatory for all VAT-registered businesses.

Q: “Can I resubmit a VAT return if I make a mistake?”
A: No. Corrections must be made in a future return or reported to HMRC.

Q: “How long do VAT refunds take?”
A: Typically within 30 days of HMRC receiving your return.

Q: “Can I claim VAT on all expenses?”
A: No. Some items (such as client entertaining or non-business use) are restricted.

Key Takeaways

Completing a VAT return isn’t just about submitting figures to HMRC. It’s about maintaining financial control, protecting cash flow, and supporting sustainable growth.

For straightforward businesses, the process is manageable with consistent record-keeping. As complexity increases, through growth, imports, or mixed income streams, having the right structure in place becomes more important.

If you’re reviewing your approach to VAT, it can be useful to step back and consider how it fits into your wider financial position, not just at the point of submission, but across the full business cycle.

Let's Talk

At Charles & Dean, we work with a broad panel of specialist lenders to support how businesses manage cash flow, including planning for VAT liabilities.

If you’re reviewing how VAT impacts your wider financial position or looking to manage upcoming payments more effectively, we can help you understand the options available.

Book a no-obligation consultation or call 01780 763836.

Charles & Dean is a credit broker, not a lender. We do not provide financial advice. All funding is subject to status and approval, and it’s important to consider your wider financial position before entering into any agreement.