Max Traditional Retirement Balance Calculator
This tool estimates a ceiling for Traditional retirement account balance at retirement: What is the maximum Traditional IRA and 401(k) on the day work stops before the future distributions are projected to be taxed above the chosen bracket?
The tool fills taxable income up to the projected upper end of the chosen tax bracket, given the assumed Social Security, pension and brokerage income, then discounts that whole stream back to first day of retirement.
Key assumption is starting nominal income in the first year of retirement. The tool adjusts inflation-linked brackets, and projected income growth each year.
You and the timeline
Sets your RMD start age.
The day the balance is measured.
You file jointly through the year of death, then single. The survivor keeps the larger benefit.
Income and taxable assets
Estimated nominal amounts in your first year of retirement, not today's values. The model grows them with inflation from there.
The annual benefit as it will be in your first year of retirement.
The first is ordinary income and eats bracket room. The second stacks on top at 0/15/20%.
Target and markets
The model solves for the withdrawal that lands exactly on this ceiling.
The return also discounts the withdrawal stream back to day one.
A flat effective rate. State tax does not change the target, only what the plan costs.
Taxable income against the limits that matter
What each ceiling costs
| Target | Maximum balance | Withdrawals it funds | Tax they cause | Medicare surcharge they add | Effective rate |
|---|
Year by year
| Age | Year | Phase | Taxable SS | Other ordinary | Qual. div & gains | IRA withdrawal | Federal tax | State tax | IRMAA | Marginal | Trad. balance | Notes |
|---|
Method and assumptions
- Tax law: 2026 federal figures from Rev. Proc. 2025-32, indexed forward at your inflation rate. Standard deduction $32,200 joint / $16,100 single; the age-65 additional deduction ($1,650 each joint, $2,050 unmarried); and the OBBBA senior deduction of $6,000 per person 65+, which phases out at 6% of income above $150,000 joint / $75,000 single and expires after 2028.
- Capital gains stack separately. Qualified dividends and long-term gains sit on top of ordinary income and are taxed at 0/15/20%, not as ordinary income. That is why "top of the 0% capital gains band" is offered as a target: it is often a better stopping point than the top of the 12% bracket.
- Thresholds that never index. Social Security taxability starts at $32,000/$44,000 joint and $25,000/$34,000 single, and NIIT at $250,000/$200,000. None of these move with inflation, so they bite harder every year in real terms.
- RMDs begin at 73 if you were born 1951–1959 and 75 if born 1960 or later, using the Uniform Lifetime Table through age 120. Where an RMD exceeds the bracket-filling withdrawal, the excess is forced out and the year is flagged.
- The RMD feedback loop. Forced distributions do not create money, they move it earlier, which overshoots the bracket now and starves later years. When holding the full present value would trigger that, the ceiling drops to the largest balance whose RMDs never breach your target, and the year-by-year table reflects that lower figure.
- Survivor transition. You file jointly through the year of a spouse's death and single thereafter. The survivor keeps the larger of the two Social Security benefits and loses the smaller.
- IRMAA uses 2026 tiers indexed forward and the statutory two-year income lookback, so a surcharge lands two years after the income that caused it. Surcharges count per enrolled person from age 65. Standard Part B and D premiums are not included, only the income-related surcharge.
- Tax is a difference, not a total. Your other income is taxed whether or not you own a Traditional account, so every tax figure attached to the ceiling is this plan minus an identical run with a zero balance. Dividing a lifetime tax total by lifetime withdrawals would otherwise report rates over 100% whenever the withdrawals are small and the other income is not. The year-by-year table is the exception: its federal and state columns are that year's whole bill.
- Nominal throughout. What you enter is your first year of retirement; what the chart and table report is the actual dollars of each calendar year, and lifetime totals are nominal sums. Nothing is deflated, so inflation is visible rather than hidden: the standard deduction and the bracket, IRMAA and capital gains thresholds all climb, while the Social Security taxability bases and the NIIT threshold stay flat and are eventually overtaken. Because these are nominal sums spanning decades, a lifetime total is larger than the same money would be worth today.
- Present value. The ceiling sits on your first day of retirement, so it is discounted back to this year at your nominal return to give a figure you can compare against your current Traditional balance. It assumes nothing further is contributed, and it disappears once the retirement year arrives, because then the ceiling is already this year's number.
- Tax law is indexed by calendar year. The 2026 tables are carried forward at your inflation rate to whatever year each row falls in, which matters if you retire well after 2026.
- Not modelled: anything to do with cashflow. There is no spending requirement, no drawdown order, no Roth balance and no cost basis, so the tool cannot tell you whether the money lasts, only what it costs in tax. Also absent: Roth conversions, QCDs, itemized deductions, ACA premium credits before 65, state estate tax, the additional Medicare tax on earned income, and sequence-of-returns risk. Returns are a flat rate, not a distribution.
This is a simplified educational model, not tax or investment advice.