Work out VAT owed to HMRC under the Flat Rate Scheme by trade sector, and compare it with standard VAT.
Check you can join
Your VAT-exclusive turnover for the next 12 months must be expected to stay below £150,000 to join the Flat Rate Scheme.
Enter your VAT-inclusive turnover
Type your total turnover including the VAT you charge customers — the Flat Rate percentage applies to this gross figure, not the net amount.
Choose your trade sector
Pick the HMRC sector that best matches your business. If your goods spend is very low, you may instead be a "limited cost trader" paying 16.5% regardless of sector.
Apply the first-year discount if eligible
Tick the first-year box if this is your first 12 months of VAT registration — it knocks 1 percentage point off your rate.
Compare the surplus against normal VAT accounting
The estimated surplus shows the gap between VAT collected from customers at 20% and what you actually owe HMRC — but remember you give up the right to reclaim most input VAT under the scheme.
What happens after you submit your Self Assessment return — refunds, balancing payments, amendments, HMRC enquiries, the SA302 for mortgages, and the 5-year record-keeping rule
Making Tax Digital for Income Tax (MTD ITSA) starts April 2026 for £50k+ self-employed and landlords. Here's what it means, when it applies to you, the software requirements and how it changes Self Assessment forever.
How HMRC's payments-on-account system works, why your first January bill is bigger than expected, when to reduce them, and the trap of treating January and July as separate
Disclaimer: All results are estimates for guidance only and do not constitute financial, tax or legal advice. Always consult a qualified professional.