What is VAT?
VAT is a consumption tax charged on most goods and services in the UK. Businesses registered for VAT act as intermediaries, collecting tax on behalf of HMRC (the UK’s tax authority) and reclaiming VAT paid on eligible expenses. For the 2025/26 tax year, the standard VAT rate is 20%, although reduced rates (5%) or zero rates (subject to VAT but at a rate of 0%) apply to specific items. Some supplies are exempt from VAT. For more information, see our guide to VAT rates.
What is Input VAT?
Input VAT refers to the tax your business pays on purchases related to its operations. These purchases could include office supplies, equipment, or services.
To reclaim VAT, you must meet two conditions:
- Your business is registered for VAT.
- You hold a valid VAT invoice from the supplier.
Example Calculation:
| Description | Amount |
|---|---|
| Total Purchase Price (Including VAT) | £1,200 |
| VAT Rate | 20% |
| Net Purchase Price (Excluding VAT) | £1,000 |
| VAT Amount (Input VAT) | £200 |
| Reclaimable Input VAT | £200 |
| Net Purchase Price = Total Purchase Price ÷ (1 + VAT Rate) = £1,200 / 1.20 = £1,000 | |
| VAT Amount = Total Purchase Price – Net Purchase Price = £1,200 – £1,000 = £200 |
What is Output VAT?
Output VAT is the tax your business charges customers on taxable sales.
Example Calculation:
| Description | Amount |
|---|---|
| Total Sale Price (Including VAT) | £2,400 |
| VAT Rate | 20% |
| Net Sale Price (Excluding VAT) | £2,000 |
| VAT Amount (Output VAT) | £400 |
| Output VAT Due to HMRC | £400 |
| Net Sale Price = Total Sale Price ÷ (1 + VAT Rate) = £2,400 / 1.20 = £2,000 | |
| VAT Amount = Total Sale Price – Net Sale Price = £2,400 – £2,000 = £400 |
Input VAT vs Output VAT: Key Differences
To clarify how these concepts interact, here’s a comparison:
| Aspect | Input VAT | Output VAT |
|---|---|---|
| Definition | VAT paid on purchases | VAT charged on sales |
| Paid/Collected by | Your business (to suppliers) | Your customers (to your business) |
| Impact on Cash Flow | Reduces VAT liability (if reclaimable) | Increases VAT liability |
| Documentation Needed | Valid VAT invoice | VAT invoice issued to customers |
How Input and Output VAT Affect Your VAT Liability
Your VAT liability is the difference between output tax and input tax. If output VAT exceeds input VAT in a VAT accounting period, you pay the difference to HMRC. If the input VAT is greater, you may receive a VAT refund.
Formula:
VAT Liability = Output VAT – Input VAT
Scenario 1:
Output VAT: £5,000
Input VAT: £3,000
VAT Liability = £5,000 – £3,000 = £2,000 (payable to HMRC)
Scenario 2:
Output VAT: £1,500
Input VAT: £2,200
VAT Refund = £2,200 – £1,500 = £700 (reclaimable from HMRC)
VAT Returns: Deadlines, Quarters, and Submission
A VAT return summarises your business’s VAT activity over a specific period, usually quarterly. It details the output VAT you’ve collected, the input VAT incurred, and the resulting VAT liability or refund.
VAT Quarters and Accounting Periods
Most UK businesses follow VAT quarters, which divide the year into four three-month periods.
For example:
| VAT Quarter | Period Covered | Submission Deadline | Payment Deadline |
|---|---|---|---|
| Quarter 1 | January – March | 7 May | 7 May |
| Quarter 2 | April – June | 7 August | 7 August |
| Quarter 3 | July – September | 7 November | 7 November |
| Quarter 4 | October – December | 7 February | 7 February |
Note: The deadline for filing a VAT return and paying any liability is one calendar month and seven days after the quarter ends.
Businesses can apply to submit monthly or annual returns.
How to Submit a VAT Return
Making Tax Digital (MTD) is now mandatory for VAT-registered businesses. Here’s how to comply:
- Keep Digital Records: Use MTD-compatible software (e.g., Xero, QuickBooks) to track input and output VAT.
- Submit Returns Electronically: Your software will calculate your VAT liability and send the return directly to HMRC.
- Pay On Time: Settle your VAT liability through online banking, Direct Debit, or bank transfer by the deadline.
Example VAT Return Submission:
Total Output VAT for Q1: £12,000
Total Input VAT for Q1: £8,500
VAT Liability = £12,000 – £8,500 = £3,500 (paid via HMRC’s online portal).
Reclaiming VAT: Rules and Best Practices
To reclaim VAT successfully:
- Keep Accurate Records: Maintain a VAT account that tracks all input and output taxes.
- Verify VAT Invoices: Ensure invoices are valid for VAT purposes. Characteristics include the supplier’s VAT registration number, the VAT amount, and a description of goods/services.
- Submit VAT Returns On Time: Use HMRC’s Making Tax Digital (MTD) system to file quarterly.
Common VAT Pitfalls to Avoid
- Mixing Personal and Business Expenses: Only claim input tax for business-related purchases.
- Missing Deadlines: Late VAT returns can incur penalties and interest.
- Incorrect VAT Rates: Charging the wrong rate of VAT (e.g., 20% on zero-rated items) may result in compliance issues.
When Do You Need to Register for VAT?
You must register for VAT if your taxable turnover exceeds £90,000 (2025/26). Voluntary registration is allowed if turnover is below this limit.
Conclusion
Mastering input VAT and output VAT is essential for accurate VAT compliance and cash flow. You’ll avoid penalties and maximise reclaim opportunities by understanding how to calculate VAT, maintain records, and submit VAT returns.
Refer to HMRC’s official VAT guide or consult a tax advisor such as U&W.
