Self-employed calculators
For sole traders, freelancers, side hustles and landlords: what to set aside for tax, allowances, mileage, VAT and late-paying clients.
- Tax set-aside calculatorEstimate Income Tax and Class 4 NI on your profit, plus a monthly pot and a payments-on-account note.
- £1,000 trading allowance calculatorClaim the allowance or your actual expenses, and do you need to register for Self Assessment?
- Mileage allowance calculatorYour HMRC simplified mileage claim at 55p then 25p a mile (2026-27), or 24p for motorcycles.
- VAT calculator & threshold checkerAdd or remove VAT at 20%, 5% or 0%, then check your rolling 12-month turnover against the £90,000 threshold.
- Late payment interest calculatorStatutory interest (8% + base rate) and the £40/£70/£100 compensation on an overdue business invoice.
- Rental income tax calculatorFor landlords: taxable rental profit, the £1,000 property allowance vs actual expenses, and the 20% mortgage interest credit.
- Tax deadlines calendarEvery Self Assessment, Making Tax Digital and tax-year deadline, free to subscribe to in Google, Apple or Outlook.
Related guides
- How much tax to set asideHow Income Tax and Class 4 NI add up, payments on account with a first-year example, and the key deadlines.
- £1,000 trading allowance guideFull and partial relief, allowance vs expenses, and when you need Self Assessment.
- Mileage & expenses guideHMRC mileage rates, what the flat rate covers, working-from-home flat rates and common allowable costs.
- Landlord rental income tax guideProperty allowance vs expenses, allowable costs, the 20% mortgage interest credit and Making Tax Digital dates.
- Late paying clients guideWhen an invoice is legally late, statutory interest, fixed compensation and how to chase politely.
Want it all in a spreadsheet?
Tidy Sheets makes simple Excel and Google Sheets templates for UK side hustles, the self-employed and household budgets.