Project your 401k retirement balance with employer matching, compound growth, and safe withdrawal rate. Find your retirement income using the 4% rule — updated 2026.
Project your nest egg with employer matching
This 401k retirement calculator projects your balance at retirement using compound growth, employer matching contributions, and inflation adjustment — then shows your estimated monthly retirement income using the 4% safe withdrawal rate from the Trinity Study. Contributing $500/month starting at age 30 with a 3% employer match and 7% return produces roughly $1.1 million by age 65. That nest egg, at a 4% withdrawal rate, generates approximately $3,667/month in retirement income — a dramatic illustration of why starting early and capturing the full employer match are the two most impactful retirement decisions most Americans make.
The inflation adjustment matters more than most savers realize. A $1 million nominal portfolio in 2055 is worth significantly less in today's purchasing power. At 2.5% average inflation, your $1 million in 30 years represents roughly $480,000 in today's dollars. This calculator shows both the nominal projected balance and the inflation-adjusted (real) value so you can plan with realistic income expectations. The 4% rule — withdraw 4% annually — was validated by the Trinity Study to sustain a balanced portfolio over 30-year retirements in over 95% of historical US market scenarios.
Employee contribution limit: $23,500 in 2026 ($31,000 if age 50+). Combined employer + employee limit: $70,000. Always contribute at least enough to capture your full employer match — it's an immediate 50%–100% return on those dollars.
Withdraw 4% of your portfolio in year one of retirement, then adjust for inflation annually. A $1M portfolio provides $40,000/year ($3,333/month) — a rate historically sustainable for 30+ years across most US market scenarios.
A 100% match on 3% of salary means 3% of your income in free contributions. At a $75,000 salary, that's $2,250/year the employer adds. Not capturing the full match is one of the most costly financial mistakes US workers make.
Traditional 401(k) reduces taxable income now; Roth 401(k) provides tax-free withdrawals in retirement. Most financial advisors recommend Roth for workers who expect to be in the same or higher tax bracket at retirement.
Retirement planning runs in two phases with opposite mathematics. Accumulation is a future value problem — contributions compounding toward a target. Decumulation is a withdrawal problem, and it introduces a risk that does not exist while saving: sequence-of-returns risk. Two retirees with identical average returns can end up in completely different positions depending on whether the bad years came first or last, because withdrawing from a portfolio that has just fallen locks in the loss. That asymmetry is why the safe withdrawal rate is far below the expected return.
Accumulation: FV = P(1+r)^n + PMT × [((1+r)^n − 1) ÷ r]Required nest egg = Annual spending ÷ Safe withdrawal rateIncome gap = Annual spending − Social Security − pensionFund only the gap, not the whole spendwhere:
Assumptions: Assumes a constant return, which no market provides. Excludes healthcare inflation, which historically outpaces general inflation, and long-term care, which is the largest unmodelled risk in most retirement plans.
SourceSSA: plan for retirement
Work from desired spending to the portfolio needed, allowing for Social Security.
Result$950,000 needed — about $1,173 a month for 25 years
Counting Social Security correctly is the single largest lever here, cutting the target by $800,000. The conservative approach is to model it at 70–80% of the projected benefit, which reflects the funding shortfall the Trustees themselves publish, rather than excluding it altogether.