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Finance & LoansGenerated accuracy model review: 2026-05-06

Traditional IRA accuracy and testing

This page documents how Calwarden builds trust for this calculator: source notes, regression-style default tests, limitations, assumptions, unit handling, rounding, and visible change history.

Formula source

  • The tool projects compound growth on the gross contribution. It then calculates the tax deduction based on your current bracket. Finally, it estimates the 'spendable' amount in retirement by subtracting future taxes.

Test cases

Default input regression check

Generated from the checked-in default inputs and calculate function.

Inputs

  • IRA Limit Preset: irs_retirement_limits_2026
  • Current Balance: $10,000
  • Annual Contribution: $7,500
  • Manual IRA Limit: $7,500
  • Years to Grow: 25
  • Annual Return: 7%
  • Current Tax Rate: 24%
  • Retirement Tax Rate: 15%

Expected outputs

  • Account Balance (Pre-Tax): $528,642.11
  • After-Tax Value: $449,345.79
  • Annual Tax Deduction: $1,800.00

Known limitations

  • Assumes contributions are fully deductible (check IRS income limits). Does not account for RMD mechanics.

Assumptions

  • Inputs are interpreted exactly as entered in the calculator form.
  • The calculation runs locally in the browser using the current checked-in calculator definition.

Unit handling

  • IRA Limit Preset accepts one of the configured options.
  • Current Balance accepts values in $.
  • Annual Contribution accepts values in $.
  • Manual IRA Limit accepts values in $.
  • Years to Grow accepts numeric values.
  • Annual Return accepts values in %.
  • Current Tax Rate accepts values in %.
  • Retirement Tax Rate accepts values in %.
  • Account Balance (Pre-Tax) is displayed as currency.
  • After-Tax Value is displayed as currency.
  • Annual Tax Deduction is displayed as currency.

Rounding rules

  • Number displays use up to 2 decimal places in the calculator UI.
  • Currency outputs are displayed with standard US dollar formatting.

Version history

1.0.0 - 2026-05-06

Generated accuracy and testing page from the current traditional-ira-calculator calculator definition.

Change log

2026-05-06

Published default regression test documentation and metadata fallbacks for Traditional IRA.

Calculator transparency

Accuracy pages are generated from checked-in calculator definitions and can be upgraded with curated review metadata over time.

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