Calculators and guides
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Free to use, no sign-up. Figures are for the 2026/27 tax year and financial year 2026, and each page links its source.
Calculators
- Corporation tax and marginal relief calculator
- Enter a company's taxable profit and associated companies to see the tax due, the marginal relief and the effective rate.
- Making Tax Digital checker
- Enter self-employment and property income to see whether you must use Making Tax Digital for Income Tax, and from when.
Making Tax Digital guides
- MTD for Income Tax: what changes in April 2027
- Thresholds, quarterly deadlines and penalties.
- MTD for landlords
- The £30,000 threshold, joint ownership and overseas property.
- MTD exemptions
- Who is automatically exempt, who can apply, and the reasons HMRC rejects.
- How to register for MTD
- What you need before you sign up, and who can sign you up.
Reference
- Rates & thresholds 2026/27
- Income tax, National Insurance, corporation tax, VAT, dividends and capital gains.
- Key dates & penalties
- Every recurring UK filing deadline, counted live from today.