401(k) FAQs

A 401k is calculated by compounding three things until retirement: your own contributions, your employer's match, and your existing balance, all growing at an expected annual return. Each year you add a percentage of your salary (capped at the IRS limit), the employer adds its match, and the whole balance compounds — so every dollar grows for all the years remaining. For example, saving $500 a month for 30 years at a 7% return grows to roughly $567,000, of which about $387,000 is investment growth rather than money you put in. That is why growth usually becomes the largest part of the total, and why starting early matters more than the exact amount you save. One caveat: these are pre-tax nominal projections, so inflation reduces real purchasing power and traditional balances are taxed as ordinary income at withdrawal.

Grow your current balance forward at your expected return, then add each year's employee and employer contributions and compound each for the years left until retirement; summing them gives your projected balance. This calculator does that year by year and shows the split between what you contributed and what growth added. For example, a 35-year-old with $40,000 saved, adding $8,000 a year at 7%, reaches about $760,000 by 65 — with growth supplying well over half. The key inputs are your balance, contribution rate, employer match, expected return, and years to retirement. One caveat: the projection assumes a steady average return, while real markets rise and fall year to year, and the figures are pre-tax nominal dollars — inflation erodes their real value, and a traditional 401k is taxed as ordinary income when you eventually withdraw.

At an absolute minimum, contribute enough to capture the full employer match — that is free money and the highest guaranteed return most people can get. Beyond the match, a common target is 15% of your gross pay including that match, building toward the annual IRS limit of $24,500 for 2026 if you can afford it. For example, on a $70,000 salary, 15% is $10,500 a year, part of which an employer match may supply. Raising your rate one percentage point a year, or with every pay rise, closes the gap almost painlessly. One caveat: only your own deferrals count toward the $24,500 limit (plus a $8,000 catch-up from age 50), not the employer match, and a traditional contribution costs less in take-home than its face value because it comes out before income tax.

Traditional (pre-tax) 401k contributions lower your adjusted gross income (AGI), and therefore your modified adjusted gross income (MAGI), because they come out of your pay before income tax is calculated. This matters because MAGI determines eligibility for things like Roth IRA contributions, IRA deduction phase-outs, and certain credits. For example, contributing $10,000 to a traditional 401k reduces the wage income on your W-2 by $10,000, lowering both AGI and MAGI by that amount. Roth 401k contributions, by contrast, are made after tax and do not reduce AGI or MAGI at all. One caveat: MAGI adds certain items back to AGI, so a 401k contribution lowers it but is not the only factor — and pre-tax contributions reduce income tax but not Social Security and Medicare (FICA) tax.

Scholarly views differ, but a common approach is to pay Zakat (2.5%) each year on the accessible, vested portion of the 401k you could actually withdraw — often calculated net of the penalty and tax you would incur to access it. For example, on a $100,000 vested balance that would net $70,000 after a hypothetical early withdrawal, one method applies 2.5% to the $70,000, giving $1,750. Others pay Zakat on the full accessible balance, or defer it until funds are actually withdrawn in retirement. Because the money is typically locked until 59½, treatment of the illiquid portion is where opinions diverge most. One caveat: this is a matter of religious jurisprudence, not tax law, and scholarly opinion genuinely varies — consult a knowledgeable authority who can weigh your specific plan, vesting, and access rules before deciding.

Contributing $500 a month — $6,000 a year — for 30 years at a 7% average annual return grows to roughly $567,000, and about $387,000 of that is investment growth rather than the $180,000 you actually contributed. That gap is the power of compounding over a long horizon. Start ten years later, at the same $500 a month, and 20 years produces only about $260,000 — less than half — which shows why time in the market matters more than the amount. Add an employer match and the total climbs higher still, since matched dollars compound alongside your own. One caveat: 7% is a long-run average, not a guarantee — real returns vary year to year — and the figure is in pre-tax nominal dollars, so inflation reduces what $567,000 will actually buy decades from now.

A widely used benchmark, popularized by Fidelity, is to have about 1× your salary saved by 30, 3× by 40, 6× by 50, and 8–10× by retirement around 67. On a $60,000 salary that works out to roughly $60,000 by 30, $180,000 by 40, and $360,000 by 50. These are guides, not rules — they rest on broad assumptions about returns, retirement age, and spending, so your personal target depends on when you plan to retire and your other income sources like Social Security or a pension. What matters more than hitting an exact multiple is a steady savings rate of around 15% including any match. One caveat: if you are behind, the age-50 catch-up lets you add $8,000 beyond the standard limit (or $11,250 at ages 60–63) to accelerate in your final working years.

Yes. Contributing to a workplace 401k does not stop you from also funding an IRA — the two limits are entirely separate. In 2026 that is up to $24,500 in the 401k plus $7,500 in an IRA ($8,600 from age 50), so a saver could set aside well over $30,000 across both in a single year. For example, you might max the match in your 401k and separately fund a Roth or traditional IRA for extra tax-advantaged growth and wider investment choice. One caveat: while you can always contribute to a 401k regardless of income, being covered by a workplace plan can phase out your traditional IRA deduction at higher incomes, and Roth IRA eligibility phases out too — so the IRA contribution may be allowed even when the deduction or Roth option is limited.

When you leave a job you have four options for the 401k: leave it with the old plan, roll it into your new employer's 401k, roll it into an IRA, or cash it out. A direct rollover — where the money moves straight between custodians — keeps the balance tax-deferred and avoids the 10% early-withdrawal penalty and income tax entirely. Cashing out before 59½ triggers both: on a $50,000 balance in the 22% bracket, that could cost around $16,000 in tax and penalty, so a rollover almost always wins. For example, rolling $50,000 into an IRA preserves the full amount to keep compounding. One caveat: an indirect rollover (a check paid to you) has 20% withholding and a strict 60-day deadline to redeposit the full amount, and rolling to an IRA can forfeit the Rule of 55's penalty-free access if you left at 55 or older.

Age 59½ is the general threshold: withdrawals taken on or after it avoid the 10% early-withdrawal penalty, though traditional-account withdrawals are still taxed as ordinary income. Before that age, several exceptions can waive the penalty — most notably the Rule of 55, which allows penalty-free withdrawals from your current employer's 401k if you leave your job in or after the year you turn 55 (age 50 for certain public-safety workers). Other exceptions include total disability, large unreimbursed medical costs, and a QDRO in divorce. For example, someone who retires at 56 can tap their most recent 401k penalty-free under the Rule of 55, but only that plan. One caveat: these exceptions remove the 10% penalty, never the income tax on pre-tax dollars — and rolling the balance into an IRA can forfeit the Rule of 55, since it applies only to a 401k, not an IRA.

A traditional 401k withdrawal is taxed as ordinary income at your marginal rate, plus any state income tax — it is not taxed at a special or flat rate. On $20,000 in the 22% federal bracket with 5% state tax, that is $4,400 federal plus $1,000 state, or $5,400 in tax before any penalty. If you are under 59½ and no exception applies, add a 10% penalty ($2,000), leaving about $12,600. A large withdrawal can also push part of itself into a higher bracket, because it stacks on top of your other income for the year, so the effective rate may exceed your current one. One caveat: your plan usually withholds 20% for federal tax up front, but that is only a prepayment — your real bill is settled when you file, and qualified Roth 401k withdrawals are tax-free.

Total tax equals your federal marginal rate plus your state rate applied to the gross withdrawal, since traditional 401k money is taxed as ordinary income. Someone in the 24% federal bracket with 6% state tax owes about 30% — $6,000 on a $20,000 withdrawal — before any early-withdrawal penalty. Because the withdrawal adds to your taxable income for the year, a large one can push its top slice into a higher bracket, raising the effective rate above your current one. Under age 59½, a 10% penalty usually applies on top unless an exception such as the Rule of 55 covers you. One caveat: the 20% your plan withholds is only an estimate toward the bill, not the final figure — if your true rate is higher you owe more at tax time, and if lower you get some back.

Under age 59½, expect a 10% early-withdrawal penalty plus ordinary income tax at your combined federal and state rate. On a $20,000 withdrawal at 22% federal and 5% state, that is a $2,000 penalty plus $5,400 in tax = $7,400 total, leaving you about $12,600 — roughly a third gone immediately. The penalty is a flat 10% of the amount withdrawn; the tax depends on your bracket and can rise if the withdrawal pushes income higher. Specific exceptions (the Rule of 55, total disability, large medical costs, a QDRO in divorce) waive the 10% penalty but never the income tax on pre-tax dollars. One caveat: the biggest cost is usually invisible — $20,000 withdrawn at 40 might have grown to around $80,000 by retirement at 7%, so the lost compounding often dwarfs the immediate tax and penalty.

Multiply the gross withdrawal by your combined marginal income tax rate — federal bracket plus state rate — to find the income tax, then add a 10% penalty if you are under 59½ and no exception applies. Subtract both from the gross to find your net cash. For example, $15,000 withdrawn at a 24% federal rate and 4% state rate incurs $4,200 in tax; if you are under 59½, a further $1,500 penalty brings the total cost to $5,700, leaving $9,300. Remember the withdrawal stacks on your other income, so part of it may fall in a higher bracket than your current one. One caveat: only pre-tax (traditional) dollars are fully taxable — qualified Roth 401k withdrawals are tax-free, and this calculator applies your stated rates to a traditional balance to estimate the net you keep.

Take the gross amount you plan to withdraw, subtract the 10% early penalty if you are under 59½ and no exception applies, then subtract federal and state income tax at your marginal rates. What remains is the cash you actually receive. On a $25,000 withdrawal at 22% federal, 5% state, and under 59½, that is a $2,500 penalty plus $6,750 in tax, leaving about $15,750 — roughly 63% of the gross. Because the plan typically withholds 20% for federal tax immediately, the check you receive up front may differ from your final after-tax figure, which is settled when you file. One caveat: this covers the cash cost only; the withdrawn money also stops compounding, so the long-run cost of taking it early is usually far larger than the tax and penalty alone suggest.

Age 59½ is exactly six months after your 59th birthday — so if you were born on 15 March, you reach 59½ on 15 September of the year you turn 59. Withdrawals taken on or after that date avoid the 10% early-withdrawal penalty, though traditional-account withdrawals remain subject to ordinary income tax. Before 59½, the 10% penalty applies unless a specific exception covers you, such as the Rule of 55 (leaving your job in or after the year you turn 55), disability, or qualifying medical expenses. Qualified tax-free Roth withdrawals require the same age plus a five-year account. One caveat: the Rule of 55 applies only to the 401k at the job you just left — rolling that balance into an IRA can forfeit the penalty-free access it would otherwise have given you.

There is no legal maximum on what you can withdraw from your own 401k once the plan permits it, but every pre-tax dollar is taxable as ordinary income and, before age 59½, hit with a 10% penalty unless an exception applies. The practical limit is how much tax and penalty you are willing to absorb. On a $30,000 withdrawal at 22% federal, 5% state, and under 59½, you would lose about $11,100 to tax and penalty, netting roughly $18,900. While still employed, many plans restrict access to hardship withdrawals or loans until you leave, so check your plan's rules first. One caveat: after 59½ there is no penalty, but from age 73 required minimum distributions force a yearly minimum — this tool shows the net cash a given withdrawal leaves after tax and any penalty.

A traditional 401k contribution comes out of your pay before income tax is calculated, which lowers your taxable income for the year and therefore your tax bill. Because you never pay income tax on the contributed dollars now, your take-home pay drops by less than the amount you save. For example, a $162 contribution from a biweekly paycheck at a 27% combined marginal rate defers about $44 in tax, so your take-home falls by only $118 — the other $44 is tax you would have paid anyway. The higher your bracket, the larger this cushion. One caveat: a traditional contribution reduces income tax but not Social Security and Medicare (FICA) tax, which is 7.65% of gross wages and still applies to your full pay, and a Roth contribution gives no up-front break at all — take-home falls by the full amount.

Multiply your gross pay for the period by your contribution percentage. At $2,700 gross per biweekly paycheck and a 6% rate, that is $162 deferred each pay period, or $4,212 over 26 paychecks. To work backwards from an annual goal, divide the target by your number of pay periods — for example, aiming for $12,000 across 24 semi-monthly paychecks means $500 each, which you then convert to a percentage of gross. Setting a percentage rather than a flat dollar keeps contributions on track as your pay changes. One caveat: for a traditional contribution, the hit to your take-home is smaller than the contribution itself because it comes out pre-tax — subtract your marginal tax rate to estimate the true paycheck impact — while a Roth contribution reduces take-home by the full amount, and your own deferrals are capped at $24,500 for 2026.

Your contribution per paycheck is gross pay × your contribution percentage — for example 6% of $2,700 is $162. To find the effect on a traditional contribution's take-home cost, subtract the contribution multiplied by your marginal tax rate from the contribution itself: at a 25% rate, a $162 contribution reduces take-home by about $122, because $40 of it is tax you would otherwise have paid. A Roth contribution has no such offset, so take-home falls by the full $162. Multiply the per-paycheck figure by your number of pay periods to project the annual total and confirm it stays under the $24,500 limit for 2026. One caveat: the pre-tax saving applies to income tax only — FICA (Social Security and Medicare) is still charged on your full gross pay, so a traditional contribution does not shrink every payroll deduction.

Take your annual contribution goal and divide it by your number of pay periods — 26 for biweekly, 24 for semi-monthly, 12 for monthly. Aiming for $12,000 a year on a biweekly schedule means about $462 per paycheck; targeting the full $24,500 limit means about $942. Alternatively, multiply each paycheck's gross by your chosen percentage to see what a given rate contributes. Converting the dollar figure to a percentage of gross keeps you on track even as your pay changes through the year. One caveat: if you want to hit the annual maximum exactly, spread it evenly rather than front-loading, because maxing out early can stop later-month employer matches unless your plan offers a true-up — and remember a traditional contribution costs you less in take-home than its face value, since it comes out before income tax.

A Roth 401k contribution is simply your gross pay × your chosen percentage, but it is taken after income tax rather than before. So 6% of a $2,700 biweekly paycheck is $162, and because it does not lower your taxable income, your take-home falls by the full $162 — there is no tax offset as there is with a traditional contribution. In exchange, qualified withdrawals in retirement (after 59½, account open five years) are entirely tax-free, growth included. The same $24,500 annual deferral limit for 2026 covers Roth and traditional combined. One caveat: even if all your own contributions are Roth, your employer's match is deposited as pre-tax money, so part of your balance will still be taxable at withdrawal — and paying tax now, at your current rate, only pays off if your rate in retirement is equal or higher.

At an absolute minimum, contribute enough to capture the full employer match — that is free money and typically the highest guaranteed return available. Beyond the match, a widely used target is 15% of your gross pay including that match, and toward the annual IRS limit of $24,500 for 2026 if you can afford it. For example, on a $70,000 salary a 15% target is $10,500 a year, of which an employer match might supply $2,100. Raising your rate one percentage point each year, or with every pay rise, closes the gap almost painlessly. One caveat: your own deferrals are capped at $24,500 (plus a $8,000 catch-up from age 50), and a traditional contribution costs less in take-home than its face value because it comes out before income tax.

Start with at least the match cap so you capture every employer dollar, then build toward 15% of gross pay including that match. If you can max out, the 2026 elective-deferral limit is $24,500, rising to $32,500 with the age-50 catch-up and $35,750 at ages 60–63. On a $90,000 salary, 15% is $13,500 a year — comfortably under the limit — while maxing out would be about 27% of pay. Increase your rate gradually rather than all at once so the change to your take-home stays manageable. One caveat: only your own contributions count toward these limits, not the employer match, and if you are hitting the ceiling, spreading contributions evenly across the year avoids forfeiting late-year matches unless your plan offers a true-up.

Subtract what you have already contributed this year from the $24,500 limit, then divide the remainder by the number of paychecks you have left. That gives the per-paycheck dollar amount; divide it by your gross pay per paycheck to get the percentage to set in payroll. For example, if you earn $90,000, have contributed $5,000, and have 20 biweekly paychecks left, the remaining $19,500 works out to $975 per paycheck — about 28% of pay. Setting a percentage rather than a flat dollar keeps you on track even as your pay changes. One caveat: from age 50 you can add a $8,000 catch-up ($11,250 at ages 60–63), and front-loading to finish early can forfeit later-month employer matches unless your plan offers a true-up.

Divide your target per-paycheck contribution by your gross pay for that paycheck, then multiply by 100. For example, $975 out of $3,462 gross is about 28%; $500 out of $2,700 is about 18.5%. Working from an annual goal instead, divide the goal by your pay periods to get the per-paycheck dollar figure first, then convert. Using a percentage rather than a fixed dollar amount means your contribution scales automatically with raises, bonuses, and pay changes, keeping you on pace without manual adjustments. One caveat: payroll systems usually round to whole or half percentages, so the exact figure may not be selectable — round up slightly rather than down to avoid falling short, and confirm the annual total stays within the $24,500 limit for 2026.

To reach the 2026 employee limit you need total deferrals of $24,500 (before any catch-up), or $32,500 from age 50 and $35,750 at ages 60–63. This tool divides the room you have left across your remaining paychecks so you land on the limit exactly by year-end — no more, no less. For example, with $10,000 already contributed and 18 paychecks remaining, the leftover $14,500 is about $806 per paycheck. Overshooting creates an excess deferral that can be taxed twice if not corrected, while undershooting wastes tax-advantaged room. One caveat: the limit is per person across every 401k you hold, so contributions to a second employer's plan in the same year count toward the same $24,500 ceiling — and only your own deferrals count here, since the employer match sits separately under the higher $72,000 combined limit.

Divide your prior-year-end (December 31) balance by the IRS Uniform Lifetime Table factor for your age. At 73 the factor is 26.5, so a $500,000 balance requires an $18,868 distribution for the year — about 3.8% of the balance. The factor shrinks each year as you age, so the required percentage rises steadily: by 80 the factor of 20.2 forces a $24,752 withdrawal on the same balance, or about 5%. You must take the full amount by December 31, though the very first year allows deferral to April 1. One caveat: each 401k must satisfy its own RMD separately — unlike IRAs, you cannot total them and withdraw from one account — and Roth 401k balances no longer require lifetime RMDs under SECURE 2.0, so only traditional balances count.

The formula is: RMD = the December 31 balance of the prior year ÷ your life-expectancy divisor. The divisor comes from the IRS Uniform Lifetime Table and decreases with age, which raises the required percentage every year. For example, a $400,000 balance at age 73 (divisor 26.5) requires about $15,094; the same balance at 75 (divisor 24.6) requires about $16,260. Most account holders use the Uniform Lifetime Table, but a different table applies if your sole beneficiary is a spouse more than 10 years younger. One caveat: the balance used is always the prior year-end figure, not today's, so a market swing during the year does not change the current RMD — and missing the deadline triggers a penalty of 25% of the shortfall, reduced to 10% if corrected promptly.

Take last year's December 31 ending balance and divide it by the Uniform Lifetime Table divisor for your current age, then repeat the calculation every year with the new balance and new divisor. The result must be withdrawn by December 31 to avoid a penalty (the very first RMD may be delayed to April 1 of the following year). For example, a $600,000 balance at age 74 uses a divisor of 25.5, giving an RMD of about $23,529. Because the divisor falls with age, the required amount rises even if your balance stays flat. One caveat: you can always withdraw more than the RMD, but the excess does not reduce future years' requirements, and each 401k is calculated and satisfied on its own — you cannot aggregate multiple 401k accounts the way IRA rules allow.

Your plan administrator often calculates and reports your RMD each year, but you are legally responsible for taking the correct amount — if the plan's figure is wrong or you hold multiple accounts, the liability is still yours. It is wise to verify it yourself using your prior-year-end balance and the IRS Uniform Lifetime Table divisor for your age. For example, on a $500,000 balance at 73, divide by 26.5 to confirm the roughly $18,868 figure. If you hold more than one 401k, each plan calculates only its own, and you must take each separately. One caveat: unlike IRAs, 401k RMDs cannot be aggregated and taken from a single account, so relying on one plan's statement can leave another plan's RMD unmet — and missing it triggers a penalty of up to 25% of the shortfall.

Required minimum distributions start at age 73 for anyone born between 1951 and 1959, and at age 75 for those born in 1960 or later, under the SECURE 2.0 Act. Before the 2022 law the age was 72, and earlier still 70½, so your exact start age depends on your birth year. Your first RMD can be delayed until April 1 of the year after you turn 73 (or 75), but doing so means taking two distributions in that year, which can push you into a higher tax bracket. For example, someone born in 1955 begins at 73; someone born in 1962 waits until 75. One caveat: Roth 401k accounts no longer have lifetime RMDs under SECURE 2.0, so only your traditional 401k balances trigger a required distribution while you are alive.

Missing a required minimum distribution triggers an excise tax of 25% of the amount you failed to withdraw — one of the harshest penalties in the tax code. The good news is SECURE 2.0 cut it from the old 50%, and it drops further to 10% if you correct the shortfall within a two-year window and file the right form. For example, missing a $20,000 RMD exposes you to a $5,000 penalty, or $2,000 if promptly corrected — on top of the ordinary income tax you still owe on the distribution itself. One caveat: the penalty applies per account per year, so overlooking one of several 401k plans is enough to trigger it — the safest approach is to automate the withdrawal each year so the deadline is never missed.

Typically only the portion of the 401k accrued during the marriage is divided, and often — though not always — it is split 50/50. For example, if a 401k grew from $100,000 at the date of marriage to $400,000 at divorce, the $300,000 marital portion is divided, giving each spouse $150,000 of it, while the pre-marital $100,000 usually stays with the original owner. The division is carried out by a Qualified Domestic Relations Order (QDRO), a court order that lets the plan pay the other spouse without triggering the 10% early-withdrawal penalty or immediate tax. One caveat: the valuation date used — marriage, separation, or divorce — is negotiated and can shift the result significantly, and how the marital portion is divided depends on state law, so this is an estimate, not legal advice.

The marital portion is generally the increase in the account's value during the marriage — roughly the current balance minus the balance on the date of marriage. Contributions and growth that occurred before the marriage are usually treated as separate property and stay with the original owner. For example, if the account held $80,000 when you married and $260,000 at divorce, the $180,000 of growth during the marriage is the marital portion subject to division, while the original $80,000 typically is not. Some states also treat post-marriage growth on the separate portion differently. One caveat: tracing the pre-marital balance requires documentation, and community-property states may treat contributions during the marriage differently from equitable-distribution states — the exact marital portion and how it is split are ultimately governed by your state's law and the court.

A Qualified Domestic Relations Order (QDRO) is a specialized court order that instructs a 401k plan administrator to pay part of one spouse's account to the other spouse (or a dependent) as part of a divorce. It is what legally allows the transfer to happen without triggering the 10% early-withdrawal penalty or immediate income tax that a normal distribution would. The receiving spouse can typically roll their share into their own IRA or 401k to keep it tax-deferred, or take cash (taxable, but penalty-free under the QDRO). One caveat: the divorce decree alone does not divide a 401k — the plan cannot act without a valid QDRO that meets federal requirements and is approved by the plan administrator, so getting the document drafted correctly and qualified is essential to actually receiving the money.

No. A 50/50 split of the marital portion is common but not universal. Community-property states (such as California and Texas) generally lean toward dividing the marital portion equally, while equitable-distribution states — the majority — divide it 'fairly,' which the court may decide is not equal after weighing factors like each spouse's income, length of the marriage, and other assets. For example, a longer marriage with a large income gap might yield a 60/40 split rather than 50/50. The exact division is either negotiated in a settlement or set by the court, then enforced through a QDRO. One caveat: only the marital portion is on the table in the first place — property accrued before the marriage is usually separate — so the headline split percentage applies to that portion, not the whole account balance.