Traditional 401(k)
Employee contributions are generally made before federal income tax is calculated, so eligible contributions can reduce current federal taxable income. Distributions are generally taxable as ordinary income.
401k Calculator & Guide
Understand when 401(k) contributions are taxed, how traditional and Roth accounts differ, what happens when you withdraw money, and how rollovers and required minimum distributions can affect your tax bill.
The tax treatment of a 401(k) depends on the type of contribution, the kind of distribution you receive, your age, and whether you meet specific IRS requirements. Traditional and Roth 401(k) accounts generally apply taxes at different stages.
Employee contributions are generally made before federal income tax is calculated, so eligible contributions can reduce current federal taxable income. Distributions are generally taxable as ordinary income.
Employee contributions are made with after-tax dollars. Qualified distributions can be tax-free when applicable holding-period and qualifying-event requirements are met.
Traditional employer matching contributions are generally tax-deferred and taxable when distributed. Special plan rules may apply to designated Roth employer contributions where offered.
The main difference is when the tax is generally paid. The best option depends on your current tax situation, expected future income, and plan features.
| Feature | Traditional 401(k) | Roth 401(k) |
|---|---|---|
| Employee contribution tax treatment | Generally pretax for federal income tax purposes | After-tax contribution |
| Current federal taxable income | Eligible contributions generally reduce it | Contributions generally do not reduce it |
| Qualified retirement withdrawal | Generally taxable as ordinary income | Generally tax-free if qualified |
| Investment growth | Tax-deferred inside the account | Can be distributed tax-free as part of a qualified distribution |
| Employer match | Traditional pretax matching is common | Designated Roth matching may be available under plan rules |
| Potential planning advantage | May help if a current deduction is valuable | May help if qualified tax-free withdrawals are valuable |
Estimate the potential current-year federal income tax reduction from an eligible traditional 401(k) contribution. Compare it with a Roth contribution to understand the difference in current tax treatment.
This calculator multiplies the eligible contribution by the selected marginal rate, subject to the income amount entered. It does not calculate your actual tax return, apply tax brackets progressively, or account for deductions, credits, payroll taxes, contribution limits, state-specific rules, or other adjustments. Actual savings may differ.
Suppose an employee contributes $7,500 to a traditional 401(k) and the full contribution is eligible to reduce federal taxable income. At an assumed 22% marginal federal income tax rate, the simplified potential federal income tax reduction is $1,650.
The amount contributed to the traditional 401(k) during the year.
$7,500 multiplied by an assumed 22% marginal federal income tax rate.
$7,500 minus $1,650, before considering state tax effects or other factors.
Taxes on a 401(k) distribution depend on whether the money is traditional or Roth, whether the distribution qualifies for favorable treatment, and whether an additional early-distribution tax applies.
Distributions from traditional pretax 401(k) funds are generally included in taxable income in the year received. The distribution may increase your total taxable income and affect your tax bracket or other income-related calculations.
A qualified distribution from a designated Roth 401(k) is generally tax-free. Qualification normally requires the applicable five-tax-year participation period and an eligible event, such as reaching age 59½, disability, or death under IRS rules.
Many taxable distributions made before age 59½ may be subject to an additional 10% federal tax unless an exception applies. Ordinary income tax and the additional tax are separate considerations.
A plan may withhold federal income tax from a distribution. Withholding is a prepayment toward your tax liability and may be more or less than the amount ultimately due when you file.
Moving retirement savings to another eligible account can preserve tax advantages, but the tax result depends on the accounts involved and how the transfer is completed.
| Transaction | Typical federal tax treatment | What to check |
|---|---|---|
| Traditional 401(k) to traditional IRA | Generally not currently taxable when completed as an eligible rollover | Account eligibility, transfer method, and deadline if applicable |
| Traditional 401(k) to another eligible traditional employer plan | Generally not currently taxable if the rollover qualifies | Receiving plan acceptance and rollover instructions |
| Traditional 401(k) to Roth IRA | Generally taxable to the extent of pretax amounts converted | Taxable conversion amount, withholding, and funds for tax payment |
| Roth 401(k) to Roth IRA | Generally eligible for a tax-free rollover | Roth distribution qualification and holding-period records |
| Eligible direct rollover | Often avoids current withholding on an eligible direct rollover | Ensure the receiving account and transaction qualify |
Required minimum distributions (RMDs) are minimum amounts that certain retirement account owners must withdraw each year. The applicable starting age and timing depend on birth year, account type, employment status, and other IRS rules.
Under current general rules, many traditional retirement account owners must begin RMDs at age 73, while people born in 1960 or later generally have an applicable starting age of 75. Special rules may apply to employer plans and certain individuals.
RMDs from traditional pretax 401(k) funds are generally taxable as ordinary income. Designated Roth 401(k) accounts are not subject to lifetime RMDs for the original account owner under current federal rules, though beneficiary distribution rules still matter.
Check whether your contributions are traditional pretax or Roth. Confirm how your payroll deductions appear on your pay statement and annual tax documents.
Before withdrawing retirement savings, review available plan options, potential income tax, additional taxes, and whether an exception applies. A loan, rollover, or hardship distribution has different rules and risks.
Converting pretax assets to a Roth account can create taxable income in the year of conversion. Estimate the potential tax bill and how you will pay it before proceeding.
Save transaction confirmations, distribution forms, rollover receipts, and account statements. These records can help establish the nature and tax treatment of retirement account movements.
Traditional 401(k) distributions can affect taxable income and may influence other income-related tax calculations. Coordinate retirement withdrawals with Social Security, pensions, investment income, and other sources.
Learn how contribution choices, tax treatment, and annual limits work together.
Understand distributions, penalties, and moving savings between eligible accounts.
Connect tax decisions with long-term savings, retirement income, and RMD planning.
Traditional pretax 401(k) contributions are generally excluded from current federal taxable income, while Roth 401(k) contributions are made with after-tax dollars. Traditional contributions generally remain subject to Social Security and Medicare payroll taxes. State tax treatment can vary.
Traditional pretax 401(k) distributions are generally taxable as ordinary income. Qualified Roth 401(k) distributions are generally tax-free. The treatment of a particular distribution depends on the source of the funds and whether applicable qualification requirements are met.
Many taxable distributions before age 59½ may be subject to an additional 10% federal tax unless an exception applies. The distribution may also be subject to ordinary income tax. Not all exceptions apply to every plan or transaction, so check the specific IRS rule.
Eligible traditional 401(k) contributions generally reduce current federal taxable income. Roth 401(k) contributions generally do not. Traditional contributions typically do not reduce Social Security and Medicare wages, and state tax treatment may differ.
Qualified Roth 401(k) distributions are generally tax-free. Qualification usually requires the applicable five-tax-year period and an eligible event such as reaching age 59½, disability, or death. Nonqualified distributions may have taxable and nontaxable components, so review the applicable IRS rules.
An eligible rollover from a traditional 401(k) to a traditional IRA is generally not currently taxable when completed correctly. Moving pretax money to a Roth IRA is generally a taxable conversion to the extent of pretax amounts. Transaction method and deadlines can matter.
Traditional employer matching contributions are generally not included in current taxable income when contributed, but they are generally taxable when distributed. Plans may offer designated Roth employer contributions under applicable rules, so check your plan's treatment.
RMDs from traditional pretax funds are generally included in taxable income in the year distributed. The starting age and deadline depend on current law, birth year, account type, employment status, and plan provisions. Designated Roth 401(k) owners are not subject to lifetime RMDs under current federal rules, but beneficiary rules differ.
State treatment varies. Many states generally follow federal treatment for traditional contributions, but not all rules are identical. Roth contributions generally do not receive the same current income tax deduction. Check your state's tax guidance or consult a qualified tax professional.
No. Withholding is generally a prepayment toward your tax liability. Your final tax depends on your total income, filing status, deductions, credits, distribution type, and other circumstances. You may owe additional tax or receive a refund when you file.
Use official resources to verify current distribution, rollover, contribution, and required minimum distribution rules.
Compare traditional and Roth contributions, understand the tax consequences of withdrawals, and verify the rules before rolling over or distributing retirement savings.
Clear guides, useful calculators and practical retirement resources to help you understand your 401(k), contributions, employer matching, Roth options, rollovers and long-term savings.
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