Self Assessment checklist
Who has to file, the 31 January 2027 deadline, penalties, the records to gather and how payments on account work.
Read the guide: Self Assessment checklistFree guides
Free guides: tax returns and budgeting
Plain-English guides for your 2025/26 tax return, due online by 31 January 2027, guides to saving, budgeting and paying off debt, and the free calculators.
Checked against GOV.UK and MoneyHelper on 8 November 2026.
Self Assessment guides
Plain answers for the 31 January 2027 deadline.
Each guide explains the GOV.UK rules in plain English, says which tax year each figure is for, and links to the GOV.UK page it came from.
Sole trader allowable expenses
What you can and cannot claim, simplified expenses for mileage and working from home, and a trading allowance calculator.
Read the guide: Sole trader allowable expensesSide hustle tax and the £1,000 allowance
When selling online or gig work becomes taxable, platform reporting to HMRC, and a calculator for what to put aside.
Read the guide: Side hustle tax and the £1,000 allowanceLandlord expenses and Section 24
What landlords can claim, repairs versus improvements, the 20% mortgage interest credit, and Making Tax Digital.
Read the guide: Landlord expenses and Section 24Budgeting guides
Make the money last from one payday to the next.
Saving for the bills that come once a year, clearing debt in the right order, and budgeting when you are paid weekly or every 4 weeks, each with a worked example.
Sinking funds for yearly bills
Save for the MOT, car insurance, the TV licence and Christmas a little at a time, with a calculator for up to six goals.
Read the guide: Sinking funds for yearly billsDebt snowball vs avalanche
Smallest balance first or highest interest first? A worked example of three UK credit cards, months and interest side by side.
Read the guide: Debt snowball vs avalancheBudgeting on weekly or 4-weekly pay
Turn monthly bills into an amount per payday, and see which months of 2027 bring an extra payday.
Read the guide: Budgeting on weekly or 4-weekly payFree calculators
Try the maths free
They run in your browser, so nothing you type is sent anywhere.