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Head-to-head · Tax Calculators

GOV.UK Self Assessment Tax Calculator vs HMRC Income Tax Estimate

  • Updated Oct 2026
  • Both researched from official sources
  • 1 check side by side
Higher score GOV.UK Self Assessment Tax Calculator #5 in Tax Calculators 8.5/10 Free plan Free plan Visit GOV.UK
HMRC Income Tax Estimate #6 in Tax Calculators 8.4/10 Free plan Free plan Visit HMRC

GOV.UK Self Assessment Tax Calculator leads on 0 checks, HMRC Income Tax Estimate on 0, and 1 is even. Who comes out ahead on the 1 yes/no, price and count check where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreGOV.UK Self Assessment Tax Calculator · 8.5/10
  • Free planboth

GOV.UK Self Assessment Tax Calculator scores higher on our rubric for tax calculators: 8.5 against 8.4 out of 10; our editors rank them #5 and #6.

On tax jurisdictions, HMRC Income Tax Estimate gives you Multiple where GOV.UK Self Assessment Tax Calculator offers Federal.

GOV.UK Self Assessment Tax Calculator is the better fit for UK self-employed people with mixed income. HMRC Income Tax Estimate is the better fit for UK employees estimating tax and take-home pay.

  • GOV.UK Self Assessment Tax Calculator fits best

    UK self-employed people with mixed income

  • HMRC Income Tax Estimate fits best

    UK employees estimating tax and take-home pay

Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. How we rank.

Side by side

Feature GOV.UK Self Assessment Tax Calculator 8.5/10 Visit ↗ HMRC Income Tax Estimate 8.4/10 Visit ↗
At a glance
Editor score 8.5 8.4
Ranking #5 in Tax Calculators #6 in Tax Calculators
Best for UK self-employed people with mixed income UK employees estimating tax and take-home pay
Pricing model Free Free
Starting price Free plan Free plan
Free plan ✓ ✓
Free trial — —
Deployment Cloud Cloud, Mobile
Platforms Web Web, iOS, Android
Support Docs Docs
Built for Solo Solo
Specs
Calculator types Income Tax; Class 4 National Insurance Income Tax and National Insurance estimate; take-home pay estimate
Tax jurisdictions Federal Multiple
Income sources self-employment profits; property rental income; State or occupational pension; paid employment Employment income; does not estimate when state benefits are the only income
Filing statuses Not checked yet Not checked yet
Tax years 2025 to 2026 2026–2027
Platforms web web; iOS; Android
Our review
Pros
  • Estimates Income Tax for the 2025 to 2026 tax year
  • Includes Class 4 National Insurance for self-employed users
  • Combines self-employment, rental, pension, and employment income
  • Estimates Income Tax, National Insurance and take-home pay
  • Includes pension contributions and student loan repayments
  • Available on web, iOS and Android
Cons
  • Assumes the standard Personal Allowance
  • Does not account for savings and investment income
  • Excludes the High Income Child Benefit Charge and amounts already paid
  • Designed for employment income rather than all income types
  • State benefits as the only income are not supported
  • Multiple jobs require a separate estimate for each job
Our verdict

GOV.UK’s Self Assessment Tax Calculator is a free web tool from HM Revenue & Customs for estimating Income Tax for the 2025 to 2026 tax year. For self-employed users, it also estimates Class 4 National Insurance. It is aimed at people who…

Read the review →

HMRC Income Tax Estimate is a free calculator for employees who pay tax through an employer. It estimates Income Tax and National Insurance for the current UK tax year, then shows estimated take-home pay. Employees can include pension…

Read the review →
  1. GOV.UK Self Assessment Tax CalculatorTax Calculators 8.5Free plan
  2. HMRC Income Tax EstimateTax Calculators 8.4Free plan

Strengths and trade-offs

  • GOV.UK Self Assessment Tax Calculator — where it wins

    • Estimates Income Tax for the 2025 to 2026 tax year
    • Includes Class 4 National Insurance for self-employed users
    • Combines self-employment, rental, pension, and employment income

    Where it doesn't

    • Assumes the standard Personal Allowance
    • Does not account for savings and investment income
    • Excludes the High Income Child Benefit Charge and amounts already paid

  • HMRC Income Tax Estimate — where it wins

    • Estimates Income Tax, National Insurance and take-home pay
    • Includes pension contributions and student loan repayments
    • Available on web, iOS and Android

    Where it doesn't

    • Designed for employment income rather than all income types
    • State benefits as the only income are not supported
    • Multiple jobs require a separate estimate for each job
  • GOV.UK Self Assessment Tax Calculator8.5/10 · Free plan

    A free web calculator for estimating 2025–26 tax across several income sources.

    Visit GOV.UKFull verdict →
  • HMRC Income Tax Estimate8.4/10 · Free plan

    A free HMRC estimator for employment tax and take-home pay.

    Visit HMRCFull verdict →

More comparisons

All tax calculators comparisons → · Full ranking →

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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update