Data Sources

All tax rates, thresholds, and allowances used in this calculator are sourced from official HM Revenue and Customs (HMRC) publications and guidance.

Official HMRC Tax Information

Primary sources for tax rates, allowances, and thresholds used in our calculations

Income Tax Rates and Allowances

Official HMRC guidance on current income tax rates and personal allowances

Scottish Income Tax

Specific rates and bands for Scottish taxpayers

Welsh Income Tax

Information about Welsh rates of income tax

National Insurance Rates

Current National Insurance contribution rates and thresholds

National Insurance for Self-Employed

Class 2 and Class 4 National Insurance rates for self-employed individuals

Dividend Tax Rates

Tax rates and allowances for dividend income

Marriage Allowance

How Marriage Allowance works and eligibility criteria

Blind Person's Allowance

Additional personal allowance for blind and partially sighted people

Pension Tax Relief

How pension contributions affect your tax

Personal Allowance Taper

How personal allowance reduces for high earners

Official HMRC Calculators

Compare your results with these official HMRC tools for verification

HMRC Tax Calculator

Official HMRC tax calculator

HMRC National Insurance Calculator

Official HMRC National Insurance calculator

Self Assessment Tax Calculator

HMRC calculator for self-employed individuals

Tax Year 2025/26

All calculations are based on the tax rates and thresholds that apply for the 2025/26 tax year (6 April 2025 to 5 April 2026). These rates are subject to change by HM Treasury and HMRC.

Last updated: January 2025

Important Note

While we make every effort to ensure our calculator reflects the most current official rates and thresholds, tax law can be complex and change frequently. Always refer to the official HMRC sources above for the most up-to-date and authoritative information.