RMD Calculator
### Retirement Portfolio Distribution Rules & IRS Mandates The Internal Revenue Code mandates that savers begin distributing tax-deferred retirement assets upon reaching statutory retirement ages to.
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📐 Formula
💡 Practical Example
A 74-year-old saver with $450k in an IRA and $200k in a 401(k) owes $25,490.20 total. They may withdraw the $17,647.06 IRA portion from whichever IRA they prefer, but the $7,843.14 401(k) portion must come directly out of the 401(k) account.
📖 About RMD Calculator
Retirement Portfolio Distribution Rules & IRS Mandates
The Internal Revenue Code mandates that savers begin distributing tax-deferred retirement assets upon reaching statutory retirement ages to ensure the federal government eventually collects deferred income taxes.
Critical Withdrawal Rules: IRAs vs. 401(k) Plans
- IRA Aggregation Rule: If you possess multiple Traditional, SEP, or SIMPLE IRAs, calculate the RMD for each account separately, but you may aggregate the total dollar amount and withdraw the entire sum from any one or combination of your IRAs.
- 401(k) / 403(b) Separate Account Rule: 401(k) RMDs cannot be aggregated across different employer accounts. You must calculate and withdraw the specific RMD amount from each individual employer retirement plan.
- Inherited IRAs (10-Year Rule): Non-eligible designated beneficiaries who inherit an IRA after 2019 must fully liquidate the inherited account within 10 years following the owner's death.
How to Use This Calculator
Enter your Traditional / Rollover / SEP IRA Balance () (e.g. 450000 in ), 401(k) / 403(b) / 457(b) Balance () (e.g. 200000 in ), Account Owner Age at Year End (e.g. 74 in yrs), Estimated Portfolio Growth Rate (%) (e.g. 5 in %), and Marginal Income Tax Rate (%) (e.g. 24 in %). Results update instantly as you type — adjust any value to compare scenarios.
The Formula
Conversion factors (to SI base unit or reference unit):
72: 27.4
73: 26.5
74: 25.5
75: 24.6
76: 23.7
77: 22.9
78: 22.0
79: 21.1
80: 20.2
81: 19.4
82: 18.5
83: 17.7
Worked Example
A 74-year-old saver with 450k in an IRA and 200k in a 401(k) owes 25,490.20 total. They may withdraw the 17,647.06 IRA portion from whichever IRA they prefer, but the 7,843.14 401(k) portion must come directly out of the 401(k) account.
Understanding Your Result
Evaluate your result in the context of your specific use case and relevant industry standards or reference values. A single calculated result is a starting point — test two to three scenarios to understand how sensitive the outcome is to your key input assumptions. For high-stakes decisions, verify your result against a secondary source or subject-matter expert before acting.
💡 Mathematical Rigor & Applied Context
- This calculator applies exact mathematical definitions following conventions established by NIST and international standards bodies.
- Rounding errors accumulate across multi-step calculations. For precision-critical work, maintain extra significant figures through all intermediate steps.
- Many mathematical concepts have multiple valid formulations — if a result seems unexpected, verify which convention or definition applies to your context.
- Dimensional analysis (unit tracking) is the fastest way to catch formula errors. Every term in an equation must have consistent, compatible units.
- Numerical methods used in digital calculators introduce floating-point precision limits (~15 significant digits for IEEE 754 double precision).
- For statistical and probabilistic calculations, always specify whether you are working with population parameters or sample statistics — formulas differ.
- Visualizing a problem geometrically or testing with known boundary values (zero, infinity, negative) reveals hidden errors faster than algebraic checking.
- When in doubt, validate your result against a simplified hand calculation or a published worked example from a textbook or standards document.
Results are for informational and educational purposes only. Always verify critical decisions with a qualified professional.