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Products that do what Calculator for US individual income tax, from 1970-present does

I wanted to share a simple web app I created recently, which lets you estimate income taxes owed in the US: https://taxsim.app All the calculations occur directly in the browser, and are powered by a Fortran program that has been converted to WASM using emscripten. This calculator was originally developed in the 1970s [1] by the non-profit National Bureau of Economic Research. NBER has been maintaining this F77 codebase for the last 50 years, and uses it primarily for academic research on tax policy. The Fortran source code itself is over 1MB of text, because it codifies both…

1. 1IT
   Income Tax Calculator▲64

   2015 · incometaxcalculator.net.in

2. 2UO
   ustaxes.org – open-source tax filing webapp▲465

   2021 · github.com

3. 3AT
   A Tax Calculator for India▲63

   2019 · github.com

4. 4
   Quarterly Tax Calculator for Freelancers▲82

   See how much you owe to state and federal in 7 sec

   2019

5. 5
   Paycheck Calculator▲77

   Easily determine your after-tax income

   2019

6. 6
   UsTaxes 2.0▲83

   Open source tax filing web-app

   2022

7. 7TP
   Tax plan impact calculator▲114

   2017 · taxulator.com

8. 8
   HivePayroll Calculate Income Tax▲76

   Calculate income tax on your earnings in a few simple steps

   2022

9. 9
   Taxily▲84

   Unlock your finances with our suite of finance calculators

   2022

10. 10
    US Tax Calculator 2026▲5

    2026 US tax calculator: federal, state & self-employment

    Jul 2026 · us-tax-calculator.com

11. 11IB
    I built a tax calculator with JavaScript▲7

    2020 · taxmygig.com

12. 12
    Tax For Freelancers▲6

    Fast, private income tax estimation built for freelancers.

    Jul 2026 · taxforfreelancers.online

13. 13
    What's the Income Tax?▲8

    Global income tax calculator

    Nov 2025

14. 14IB
    I Built a Simple German Gross-to-Net Salary Calculator▲11

    I developed an intuitive, cross-platform tool to calculate net salaries in Germany. It simplifies the complexity of taxes, deductions, and social contributions while keeping a clean, minimalistic design. With straightforward functionality and clear visualizations, it helps users easily understand how their gross salary breaks down into take-home pay.

    2024 · netsalarygui.de

15. 15
    TaxRadar▲3

    Free freelance tax calculator across all 50 US states

    Jun 2026 · taxradar.xyz

16. 16
    Spaife▲3

    One running tax estimate across everything you earn

    5d ago · spaife.com

17. 17
    USAFinCalc▲2

    Free IRS-accurate financial calculators for Americans

    May 2026 · usafincalc.com

18. 18
    oneshekel.com

    Free UK & US income tax calculator.

    Jun 2026 · oneshekel.com

19. 19
    TheMetricApp▲2

    The metric app is very useful for tax calculation

    Jul 2026 · themetricapp.com

20. 20
    Hourly to Salary Paycheck Calculator▲11

    Free hourly to salary & take-home tax calculator

    Jul 2026 · globaltoolsbox.online

21. 21
    US Pay Calc▲5

    Free paycheck calculator for all 50 US states

    Jul 2026 · uspaycalc.com

22. 22
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    Accurate. Visual. Fully Customizable

    Dec 2025

23. 23
    PayCalcHub▲5

    Take-home pay calculators for all 50 US states. Always free.

    Jul 2026 · paycalchub.com

24. 24
    SmartTaxCalc▲9

    38 free Indian tax & finance calculators, CA-reviewed

    Jul 2026 · smarttaxcalc.in

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