401(k) Withdrawal Calculator

Before you enter your numbers

Use the balance available at the start of withdrawals and the number of years it should last. Enter a return after investment expenses. Monthly payments remain level and are not automatically increased for inflation. Keep any emergency reserve outside the balance if it should not be spent.

• 401(k) balance
• Years the account needs to fund
• Expected annual return

Input reference

• 401(k) balance: The money available when the withdrawal period begins. Subtract any immediate lump-sum spending or reserve you intend to exclude before entering the balance. The model assumes the full entered amount can support payments.
• Years to fund: The duration of the calculation in years. Longer periods give growth or withdrawals more time to operate. This is a chosen modeling horizon, not a prediction of an investment term or your lifetime.
• Annual return: An assumed nominal annual rate, divided by 12 in monthly projections. It is held constant. It is not a guaranteed yield, and the default should be replaced with an assumption suited to your scenario.

Formula and calculation method

The monthly payment is the annuity payment that amortizes the fund to zero: balance × monthly rate / [1 − (1 + monthly rate)^−months]. At zero return, divide the balance by the number of payments. Total planned withdrawals include principal and modeled growth.

Worked example

At zero return, a 240,000 account over 20 years produces 1,000 monthly and 12,000 annually. Spreading the same balance over 30 years gives about 667 monthly. Neither figure is adjusted for federal or state tax.

How to interpret the result

The result panel reports estimated monthly and annual withdrawals plus total planned withdrawals.

Traditional and designated Roth balances may have different tax treatment. A gross payment is not necessarily spendable income. Required minimum distributions can also constrain later withdrawals independently of this schedule. Confirm plan distribution options and current rules before moving money.

A simple 401(k) withdrawal example

A balance of 800,000 funded over 25 years at an assumed 4% annual return can support a different monthly withdrawal than the same balance held in cash. The calculator solves the level withdrawal that would amortize the balance over the selected period.

The output is before tax and does not apply required minimum distributions or plan-specific rules. Use it as a spending-capacity estimate, then check tax and distribution requirements separately.

Build a withdrawal calendar before taking money

A level payment over 25 years is only one possible schedule. Your plan may allow different distribution frequencies, and tax rules can impose separate requirements. Record the account type, intended payment dates and other taxable income before using the gross amount in a household budget.

The formula assumes every payment is made at month end. Taking a larger amount early removes money from the fund sooner. If you need an initial lump sum for a mortgage or another expense, subtract it from the starting balance and rerun the ongoing payout, while considering any associated tax cost separately.

Separate account longevity from taxes and required distributions

The result estimates how a balance changes as withdrawals are made, but the amount you can spend after tax may be lower than the gross withdrawal. Traditional account distributions, Roth treatment and required minimum distribution rules can differ, so do not use the gross result as a tax projection.

Use a withdrawal amount that matches the same frequency and dollar basis as your retirement budget. If you plan to increase withdrawals with inflation, compare the result with the broader Retirement Withdrawal Calculator, which is designed around retirement spending rather than account labeling alone.

Use The Result In The Next Calculation

Use this withdrawal estimate with your broader retirement-income plan. Compare the payment with Social Security and pension income, then use the retirement withdrawal calculator if you want to model how long the combined savings balance may last.