UK VAT registration is mandatory when your taxable turnover on a rolling 12-month basis exceeds £90,000 (2026/27 threshold). You have 30 days from the date the threshold was exceeded to register. Voluntary registration below the threshold is optional and can be beneficial if you have substantial VAT-bearing inputs. Making Tax Digital (MTD) VAT is mandatory for all VAT-registered businesses — you must file VAT returns through approved software (FreeAgent, Xero, QuickBooks, Sage, etc.). Standard rate is 20%; reduced rates 5% (energy) and 0% (food, children's clothing) apply to specific goods. Most small UK businesses should NOT register voluntarily — the compliance cost outweighs the input reclaim for service-based businesses.
When you must register
Two triggers for mandatory VAT registration:
- Rolling 12-month threshold: at the end of any month, if your taxable turnover for the previous 12 months exceeds £90,000.
- 30-day look-ahead: if you expect your taxable turnover to exceed £90,000 in the next 30 days alone (e.g. a single large contract).
The 30-day registration deadline starts from the day the threshold was exceeded. Miss it: HMRC charges late-registration penalties + back-VAT on supplies made post-threshold.
What "taxable turnover" actually means
Counted toward the £90k threshold:
- Sales of standard-rated goods/services (20%).
- Sales of reduced-rate goods/services (5%).
- Sales of zero-rated goods/services (0% but still "taxable" for threshold purposes).
- Goods sold in the UK from overseas.
NOT counted:
- Sales of VAT-exempt goods/services (insurance, finance, education, healthcare, residential rent, postage stamps, some land transactions).
- Sales outside UK VAT scope (services to overseas business clients).
- Capital asset disposals (selling business equipment, premises).
- Investment income.
Voluntary registration — when it makes sense
If your turnover is below £90k, you can voluntarily register. Pros and cons:
| Pros of voluntary registration | Cons |
|---|---|
| Reclaim VAT on business expenses (rent, equipment, professional services) | Must charge VAT on sales — making your prices 20% higher to non-VAT-registered customers |
| Look more established to B2B customers | Quarterly VAT returns + MTD compliance burden |
| Pre-trade input VAT recoverable for up to 4 years pre-registration | Bookkeeping complexity |
| Potential cashflow benefit if cash accounting scheme | £300-£1,000/year accounting cost increase |
Voluntary registration usually makes sense when:
- Most customers are VAT-registered businesses (they reclaim your VAT, so the 20% surcharge doesn't affect them).
- You have substantial input VAT (e.g. capital purchases, expensive equipment).
- You're close to the £90k threshold anyway — register early to avoid surprise.
Voluntary registration usually doesn't make sense when:
- Most customers are consumers or non-VAT-registered (your prices effectively rise 20%).
- You have minimal input VAT (service business with low overheads).
- Compliance burden + accountant cost > input reclaim value.
VAT rates in 2026/27
| Rate | Applies to |
|---|---|
| Standard 20% | Most goods and services |
| Reduced 5% | Domestic energy, children's car seats, mobility aids, some installations |
| Zero 0% | Most food (not catering), children's clothing, books, newspapers, public transport |
| Exempt | Insurance, finance, education, healthcare, residential rent, postage stamps, land (with exceptions) |
| Outside scope | Wages, dividends, gifts, services supplied outside UK |
Making Tax Digital (MTD) VAT
Since April 2022, all VAT-registered businesses (including voluntarily registered) must:
- Keep digital records of VAT-related transactions.
- File VAT returns through approved software (not the HMRC online form).
- Have "digital links" between record-keeping systems (no manual copy-paste).
Approved software includes:
- FreeAgent — popular for freelancers, free with NatWest/RBS business banking.
- Xero — small business standard, ~£25-£50/month.
- QuickBooks Online — popular with accountants, ~£20-£40/month.
- Sage Accounting — established mid-market, ~£20-£40/month.
- Bridging software — if you use spreadsheets, "bridging" software like Cirrostratus or Tap connects them to HMRC.
How to register
- Apply online: at gov.uk/register-for-vat. Need a Government Gateway account.
- Provide: business name, address, contact details, estimated annual turnover, business start date, bank details for refunds, NI number / company UTR.
- HMRC processes: typically 10-30 working days. You'll receive a VAT registration number (VRN) and effective date of registration.
- Set up MTD software: before your first VAT return is due.
- File first return: within 1 month + 7 days of period end (most are quarterly).
VAT compliance calendar
| Action | Deadline |
|---|---|
| VAT return + payment (quarterly) | 1 month + 7 days after period end |
| Pre-period VAT return reminders | ~2 weeks before due |
| Annual VAT review | End of accounting year (some businesses) |
| Threshold check (rolling 12-month) | Continuous — review monthly |
Common VAT mistakes
- Missing the registration deadline. The 30-day window starts on the day you exceeded threshold, not when you noticed. Track turnover monthly.
- Including VAT-exempt sales in threshold calculation. Only taxable supplies count. Distinguishes a £100k catering business from a £100k insurance broker.
- Late returns. Penalties accrue. The "Default Surcharge" system penalises late filers.
- Voluntary registration without analysis. Many small service businesses voluntarily register without checking whether their customers can absorb the 20% increase.
- Forgetting MTD VAT requirements. Filing through old methods (HMRC online portal) is no longer permitted for VAT returns.
Sources and methodology
VAT registration threshold from HMRC announcement; £90k threshold effective from April 2024 onwards. MTD VAT mandatory from April 2022. See HMRC's VAT guidance and MTD VAT. For complex VAT positions (international, partial-exemption, group registration), see the tax adviser editorial recommendation. The methodology page documents sources.
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