Free calculators
Free tools to help sole traders, landlords, and MTD taxpayers estimate their tax position — quickly and without jargon.
Estimate your UK rental income tax liability for 2025–26. Accounts for Section 24 mortgage interest relief, allowable expenses, and your income tax band.
Find out if Making Tax Digital for Income Tax applies to you, and which deadline applies based on your qualifying income.
Estimate your income tax and Class 4 National Insurance as a self-employed sole trader for the 2025–26 tax year.
ArcTax connects directly to HMRC via OAuth — submit quarterly updates and track your obligations in one place.
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