401(k) Withdrawal Calculator: Monthly Income in Retirement
Work out the monthly income a 401(k) balance can provide in retirement, and how long the account will last as it is drawn down.
Adjust the inputs and select Calculate for a full breakdown.
Compare Common Scenarios
How the numbers shift across typical situations for this calculator:
| Scenario | Monthly income | Total drawn | Growth while drawing |
|---|---|---|---|
| $600k · 5% · 30yr | $3,220.93 | $1,159,534.71 | $559,534.71 |
| $300k · 4% · 25yr | $1,583.51 | $475,053.16 | $175,053.16 |
| $1M · 6% · 30yr | $5,995.51 | $2,158,381.89 | $1,158,381.89 |
| $450k · 5% · 20yr | $2,969.80 | $712,752.20 | $262,752.20 |
How This Calculator Works
Enter the 401(k) balance at retirement, the return you expect the remaining balance to earn, and the number of years the money must last. The calculator finds the fixed monthly withdrawal that draws the account down to zero at the end of the period.
The Formula
Fixed-Period Drawdown
PV = savings pot, r = monthly rate (annual ÷ 12), n = number of monthly payments
Worked Example
A $600,000 401(k) earning 5% over a 30-year retirement supports about $3,221 a month before tax. Withdrawals total roughly $1.16 million over the period, with growth on the balance supplying most of the difference.
Key Insight
These figures are pre-tax. Withdrawals from a traditional 401(k) are taxed as ordinary income, and from a set age required minimum distributions force a minimum withdrawal each year — so the spendable income is lower than the figure shown.
Early withdrawal penalties and exceptions
Pre-59½ 401(k) withdrawals normally trigger 10% early withdrawal penalty PLUS ordinary income tax. For $20K withdrawal by 35-year-old in 24% bracket: $20K × 10% penalty + $20K × 24% income tax = $6,800 total tax. Effective receipt: $13,200. The penalty-plus-tax structure makes early 401(k) withdrawal generally inadvisable for routine cash needs.
Exceptions waive the 10% penalty (but income tax still applies). Common exceptions: separation from service at age 55+ (Rule of 55); first home purchase (up to $10K, IRA-only typically); higher education expenses; significant medical expenses; permanent disability; substantially equal periodic payments (SEPP/72(t)) — used by early retirees to access 401(k) early without penalty via complex calculation.
SECURE 2.0 Act (2022) added new exceptions: emergency expenses (up to $1,000 per year, beginning 2024); domestic abuse victim payments (up to $10,000); long-term care insurance (up to $2,500/year); federally declared disaster relief (up to $22,000). These provide more flexibility but each has specific qualification requirements.
Required Minimum Distributions (RMDs)
Traditional 401(k) and IRA owners must begin RMDs at age 73 (SECURE 2.0 Act, effective 2023; will rise to 75 by 2033). Annual RMD = account balance / IRS life expectancy factor. At age 73, factor is 26.5: $500K balance produces $18,868 RMD. Factor decreases with age (smaller divisor = larger RMD), so RMD percentage grows from ~3.8% at 73 to ~5.8% at 80 to ~10% at 90.
RMD must be taken by December 31 each year. Missing RMD triggers 25% excise tax on shortfall (reduced to 10% if corrected within 2 years under SECURE 2.0). For $20K missed RMD: $5K penalty if not corrected; $2K if corrected. Financial firms (Fidelity, Vanguard, Schwab) handle RMD calculation and distribution automatically when set up.
Roth 401(k) and Roth IRA: Roth 401(k) had RMDs until 2024; SECURE 2.0 Act eliminated Roth 401(k) RMDs effective 2024 (matching Roth IRA which never had RMDs). For tax-planning purposes, leaving balance in Roth accounts longer is now better. Note: inherited IRAs (non-spouse beneficiaries) typically must be fully distributed within 10 years under SECURE 2.0.
401(k) withdrawal scenarios — monthly income from various balances
Reference monthly retirement income from 401(k) at 4% safe withdrawal rate, plus RMD requirements.
| 401(k) balance | Annual 4% SWR | Monthly income | RMD age 73 |
|---|---|---|---|
| $250K | $10K | $833 | $9,434 |
| $500K | $20K | $1,667 | $18,868 |
| $750K | $30K | $2,500 | $28,302 |
| $1M | $40K | $3,333 | $37,736 |
| $1.5M | $60K | $5,000 | $56,604 |
| $2M | $80K | $6,667 | $75,472 |
| $3M | $120K | $10,000 | $113,208 |
RMD percentage at age 73 is ~3.77% — close to but slightly below 4% SWR. As account holder ages, RMD percentage increases (factor decreases) — eventually exceeds 4% safe withdrawal rate. Combined with Social Security and other income sources, this provides retirement income; complete picture requires Social Security claiming strategy and other retirement income coordination.
Frequently Asked Questions
Are 401(k) withdrawals taxed?
Withdrawals from a traditional 401(k) are taxed as ordinary income. The monthly figure here is pre-tax, so the spendable amount is lower.
What are required minimum distributions?
From a set age, the IRS requires a minimum amount to be withdrawn from a traditional 401(k) each year. This calculator does not enforce that minimum.
What return should I assume in retirement?
Retirement portfolios are usually more conservative than during working years. A rate between cash and a balanced portfolio is common; lower is more cautious.
What if I withdraw before retirement age?
Withdrawals before the qualifying age can trigger an early-withdrawal penalty on top of income tax. This calculator models drawdown in retirement.
What happens when the period ends?
The balance is fully drawn down and withdrawals stop. To avoid running out, choose a period that comfortably covers your expected retirement length.
When is this calculator unreliable?
As a long-term sustainability guarantee — assumes constant returns ignoring sequence-of-returns risk. Bad market returns in first 5-10 years of withdrawal can permanently damage portfolio even if average returns are normal. For honest retirement income planning, model conservative scenarios (3% withdrawal) and maintain flexibility to reduce spending in down markets.
References & Authoritative Sources
- Internal Revenue Service (IRS) — 401(k) Plans — Distributions · consulted June 1, 2026 · Federal regulator on 401(k) withdrawal rules
- U.S. Department of Labor — EBSA — Retirement Plan Withdrawal Information · consulted June 1, 2026 · Federal employee benefits regulator
- Bengen — Determining Withdrawal Rates — Original 4% Safe Withdrawal Rate Study (1994) · consulted June 1, 2026 · Academic foundation for 4% rule
Related Calculators
Data Sources & Benchmarks
This calculator draws on 3 independent, dated sources. The starting values for expected annual return are taken from the benchmarks below and refresh whenever the snapshots are updated.
Methodology & Review
401(k) withdrawal calculates monthly retirement income from a 401(k) balance using safe withdrawal rate or required minimum distribution (RMD) frameworks. The calculator returns sustainable monthly withdrawal. U.S. 401(k) rules: pre-59½ withdrawals subject to 10% early withdrawal penalty plus ordinary income tax; age 59½+ allows penalty-free withdrawals; age 73+ requires RMDs (SECURE 2.0 Act raised from 72 to 73 effective 2023, to 75 by 2033). Standard SWR for traditional retirement: 4% (Bengen 1994). Conservative for early retirement: 3.0-3.5%. RELIABILITY: Reliable for documented balance with constant assumed returns. Less reliable as forward projection because (a) actual returns vary substantially year-to-year; (b) sequence-of-returns risk in early withdrawal years can permanently damage portfolio; (c) inflation requires withdrawal increases over time; (d) healthcare costs typically rise dramatically with age, increasing withdrawal needs.
Updated