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Head-to-head · Tax Calculators

Federal Income Tax Calculator by SmartAsset vs HMRC Income Tax Estimate

  • Updated Oct 2026
  • Both researched from official sources
  • 1 check side by side
Higher score Federal Income Tax Calculator by SmartAsset #1 in Tax Calculators 9.3/10 Free plan Free plan Visit SmartAsset
HMRC Income Tax Estimate #6 in Tax Calculators 8.4/10 Free plan Free plan Visit HMRC

Federal Income Tax Calculator by SmartAsset 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 scoreFederal Income Tax Calculator by SmartAsset · 9.3/10
  • Free planboth

Federal Income Tax Calculator by SmartAsset scores higher on our rubric for tax calculators: 9.3 against 8.4 out of 10; our editors rank them #1 and #6.

Federal Income Tax Calculator by SmartAsset is the better fit for U.S. taxpayers comparing take-home pay and tax. HMRC Income Tax Estimate is the better fit for UK employees estimating tax and take-home pay.

  • Federal Income Tax Calculator by SmartAsset fits best

    U.S. taxpayers comparing take-home pay and tax

  • 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 Federal Income Tax Calculator by SmartAsset 9.3/10 Visit ↗ HMRC Income Tax Estimate 8.4/10 Visit ↗
At a glance
Editor score 9.3 8.4
Ranking #1 in Tax Calculators #6 in Tax Calculators
Best for U.S. taxpayers comparing take-home pay and tax 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 Email Docs
Built for Solo Solo
Specs
Calculator types Federal, FICA, state and local income tax; take-home pay Income Tax and National Insurance estimate; take-home pay estimate
Tax jurisdictions Multiple Multiple
Income sources Household income; retirement account contributions and other pre-tax deductions Employment income; does not estimate when state benefits are the only income
Filing statuses Single; married filing jointly; married filing separately; head of household Not checked yet
Tax years 2025 2026–2027
Platforms Web web; iOS; Android
Our review
Pros
  • Estimates federal, FICA, state and local income taxes
  • Supports filing status, deduction, retirement and credit inputs
  • Shows marginal and effective tax rates alongside annual take-home pay
  • Estimates Income Tax, National Insurance and take-home pay
  • Includes pension contributions and student loan repayments
  • Available on web, iOS and Android
Cons
  • Provides estimates rather than tax-return filing
  • Results may differ from actual tax outcomes
  • Available on the web rather than as a listed native app
  • 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

SmartAsset’s Federal Income Tax Calculator is a free web tool for people estimating taxes and take-home pay. It accepts household income, location and filing status, with choices for single, married filing jointly, married filing…

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. Federal Income Tax Calculator by SmartAssetTax Calculators 9.3Free plan
  2. HMRC Income Tax EstimateTax Calculators 8.4Free plan

Strengths and trade-offs

  • Federal Income Tax Calculator by SmartAsset — where it wins

    • Estimates federal, FICA, state and local income taxes
    • Supports filing status, deduction, retirement and credit inputs
    • Shows marginal and effective tax rates alongside annual take-home pay

    Where it doesn't

    • Provides estimates rather than tax-return filing
    • Results may differ from actual tax outcomes
    • Available on the web rather than as a listed native app

  • 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
  • Federal Income Tax Calculator by SmartAsset9.3/10 · Free plan

    A free web calculator for comparing estimated taxes and take-home pay.

    Visit SmartAssetFull 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 →

Guides on tax calculators

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update