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Historical 2020 Roth Phase-Out Scenario

Explore a simplified 2020 income phase-out and annuity-due projection using captured historical filing thresholds.

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How to use this calculator

  1. Enter the known values in the units shown. Results update as you type.
  2. Where results are editable, change one to solve backwards. Lock a value to hold it fixed.
  3. Use the worked example to check the method. Reset restores the starting fields.

Use the result with context

Results are estimates for planning and education. Confirm rates, taxes, fees, and legal requirements with the relevant institution or a qualified professional before making a financial decision.

Formula and method

A single filer aged 49 with 2020 MAGI of 131500 is halfway through the 124000–139000 band. The simplified prorated annual budget is 3000; one beginning-year deposit at 10% grows to 3300.

Prorated budget = annual cap × max(0,min(1,(upper threshold − income)/(upper − lower))); future value compounds beginning-year contributions.

Worked example

Enter these known values and leave the other values blank.

Tax filing
Single
Modified annual gross income (MAGI)
131500 USD
Current age
49 years
Retirement age
50 years
Hypothetical deposit budget reduction
0 %
Annual return rate
10 %
Max contribution
6000 USD
2020 simple prorated annual budget
3000 USD
Eligible contribution after-tax
3000 USD
Roth IRA Balance at retirement
3300 USD

Assumptions and limitations

  • This is a historical 2020 proportional scenario, not a current contribution-limit or eligibility determination. The exact IRS worksheet includes rounding, a minimum reduced limit, compensation and other IRA contribution rules that this simple proportional model omits.
  • Historical annual caps are 6000 below age 50 and 7000 from age 50. The retained source accepts whole ages 1 through 69 for this projection; that is a model restriction, not a statutory contribution-age ceiling. The married-separate band assumes living with a spouse during the year; otherwise the single band applies.
  • The extra tax fraction simply reduces the hypothetical deposit budget. Roth contributions are not deductible; this field is not an IRS contribution-limit adjustment.
  • Enter all monetary amounts in a single currency. Retained currency conversion factors are a captured static snapshot, not live exchange rates.
  • Clear a known field before solving for it. Locks retain chosen inputs; inconsistent locked values need correction. Reset restores the captured defaults.
  • Use the documented finite scenario domain. return rate must be positive. Projection retirement age must exceed entered age. Use a nonnegative whole age. magi cannot be negative. Use a percentage between zero and 100. Translate the captured age cap and proportional phase-out helper to local bounded arithmetic, retaining every 2020 dataset option and captured inverse. Historical thresholds and caps are explicitly dated; this simplified prorated budget is not the complete statutory worksheet. Allow zero hypothetical budget reduction instead of the source’s positive-only requirement.

Common questions

What does the worked example show?

A single filer aged 49 with 2020 MAGI of 131500 is halfway through the 124000–139000 band. The simplified prorated annual budget is 3000; one beginning-year deposit at 10% grows to 3300.

What assumptions limit this calculation?

This is a historical 2020 proportional scenario, not a current contribution-limit or eligibility determination. The exact IRS worksheet includes rounding, a minimum reduced limit, compensation and other IRA contribution rules that this simple proportional model omits.

References

Use the documented finite scenario domain. return rate must be positive. Projection retirement age must exceed entered age. Use a nonnegative whole age. magi cannot be negative. Use a percentage between zero and 100. Allow a zero hypothetical tax-budget reduction; this is not a statutory contribution-limit adjustment. Integer membership is checked with isInteger, so ordinary, tiny and large fractional counts are rejected even when tolerant floor equality would pass. Translate the captured age cap and proportional phase-out helper to local bounded arithmetic, retaining every 2020 dataset option and captured inverse. Historical thresholds and caps are explicitly dated; this simplified prorated budget is not the complete statutory worksheet.

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