Estimate your UK Self Assessment bill in minutes
For rest-of-UK taxpayers in 2024/25 and 2025/26, TaxKiln turns your income and reliefs into a clear estimate of what you owe HMRC, with a full breakdown of tax, NIC and student loans.
How it works
Tell us about your year
Add your self-employment profits, PAYE, property income, savings and dividends.
Apply reliefs and loans
Include Gift Aid, pension contributions, SEIS/EIS/VCT and student loans where relevant.
See your estimated bill
Get a breakdown of income tax, NIC and student loan, plus a single "what you're estimated to owe HMRC" figure.
Who this is for
Sole traders & side-hustlers
See how much to set aside for tax on your profits.
Landlords & investors
Factor in rental profits, interest and dividends in one place.
Advisers & accountants
Sanity-check client figures and run what-if scenarios before filing.
About You
Let's start with some basic information to calculate your tax correctly.
Which tax year are you calculating for?
Where do you pay income tax?
UK Resident for Full Year
Were you a UK tax resident for the entire tax year?
Foreign Income
Do you have income from outside the UK?
Trust or Estate Income
Do you receive income from a trust or deceased person's estate?
Remittance Basis
Are you claiming the remittance basis for foreign income?
Date of Birth
Used to determine eligibility for certain allowances
Blind Person's Allowance
Are you registered as blind or severely sight impaired?
Marriage Allowance
Transfer allowance between spouses/civil partners