Rule of 55: does your exit year open your 401(k) without the 10 %?
Leave your employer in the calendar year you turn 55, or later, and the 401(k) or 403(b) of that employer pays you with no 10 % additional tax, even though you are not yet 59½.
Rule of 55 applies: no 10 %
$4,000 saved
Because you left in or after 2026, the year you turn 55.
| Federal income tax on it | $2,620 |
| 10 % additional tax | $0 |
| 20 % withheld by the plan | $8,000 |
| You keep (federal only) | $37,380 |
Only the plan of the employer you leave. An IRA, or a rollover into one, loses the rule.
Worked out by Radif Partners · How we calculate · figures read on irs.gov and healthcare.gov · not personal financial advice
The rule of 55 is the exception in IRC section 72(t)(2)(A)(v): a distribution from an employer plan is free of the 10 % additional tax when you separate from service during or after the calendar year in which you reach age 55. The test is the year, not the birthday: someone born in December 1971 who leaves in January 2026 qualifies, although still 54 on the last day of work. Qualified public safety employees of a state or local government, federal law enforcement officers, firefighters and air traffic controllers use age 50, or 25 years of service under the plan if that comes first (Publication 575). Only the plan of the employer you leave is covered: older 401(k)s and every IRA stay locked until 59½. Income tax is still due, and the plan withholds 20 % of a cash payment. The checker above takes your birth year and exit year and shows what the rule saves on your withdrawal.
The year test, in the words of the IRS
The IRS table of exceptions puts it in one line: no additional tax when "the employee separates from service during or after the year the employee reaches age 55". Read it on irs.gov. Publication 575 adds the warning that trips people up: you cannot separate before that year and then wait. Its own example is a man who left at 49 and took money in the year he turned 55; the 10 % applied, because the separation came first.
Three consequences follow from the wording. The reason you leave does not matter: a layoff, a resignation and a retirement all count. You do not need to stay retired: a new job elsewhere leaves the old plan open under the rule. And the date of the payment does not matter either: once you have separated in the right year, a withdrawal at 56 or at 58 is covered as well.
Born in December: does a January exit count?
Rule of 55 applies: no 10 %
$4,000 saved
| Federal income tax on it | $2,620 |
| 10 % additional tax | $0 |
| 20 % withheld by the plan | $8,000 |
| You keep (federal only) | $37,380 |
Which money the rule reaches
| Account | Rule of 55? | Before 59½ otherwise |
|---|---|---|
| 401(k) or 403(b) of the employer you leave | yes | locked |
| 401(k) of an earlier employer | no, unless rolled into the current plan before you leave | locked, or 72(t) |
| Traditional IRA, rollover IRA, SEP | never | locked, or 72(t) |
| Governmental 457(b) | not needed | no 10 % at any age |
| Roth IRA contributions | not needed | free at any age |
The second line is where planning pays. An old 401(k) sitting with a former employer does not qualify, but many plans accept a rollover in while you still work there. Moved into the current plan before your exit, that money leaves under the rule of 55 together with the rest. The opposite move destroys the exception: roll the plan into an IRA after you leave and the money falls under IRA rules, where separation from service is not an exception at all. The checker treats an IRA withdrawal at 55 as penalized for that reason: on $40,000 it costs $4,000 that the plan payout does not.
What it saves, and what it does not
Take a single person born in 1971 who leaves in 2026 and takes $40,000 from that employer's 401(k), with no other income in the year. The 10 % would have been $4,000; under the rule it is zero. Federal income tax stays: with the 2026 standard deduction of $16,100 and the 10 % and 12 % brackets, the bill is about $2,620. The plan will still withhold $8,000 at payout, because 20 % withholding applies to any eligible rollover distribution paid to you; the difference comes back as a refund when you file.
That gap between withholding and real tax is a cash-flow issue in the first year of early retirement. Asking the plan for two smaller payments in different tax years, or for the amount you need grossed up for the withholding, avoids running short. The withdrawal and withholding calculator shows both numbers.
Plan rules can be stricter than the law
The tax code allows the exception; it does not force the plan to pay on demand. Some 401(k) plans let a former employee take any amount at any time, others only a lump sum, others a fixed installment schedule. A plan that pays only a lump sum turns the rule of 55 into one large taxable year: the whole balance lands on one return and can climb to the 24 % or 32 % bracket. Read the summary plan description before you give notice, and ask the administrator in writing whether partial withdrawals are allowed after separation.
Using it in a FIRE plan
For someone who stops at 55, the rule turns the largest account into the bridge. Spending comes from the employer plan from 55 to 59½, filling the 0 % and low brackets each year, while the IRA and the Roth keep growing untouched. Retiring at 52 instead, the same 401(k) stays locked for three and a half more years, and the gap must come from taxable savings, Roth contributions, a conversion ladder or a 72(t) series. The early retirement calculator applies the rule automatically when the retirement age you test is 55 or more.
The same money from an IRA at 55
You keep
$21,610
| 10 % additional tax | $2,500 |
| Federal income tax | $890 |
| State income tax | $0 |
| Withheld at payout | $0 |
Public safety: age 50, or 25 years of service
For qualified public safety employees the age drops to 50, and Publication 575 adds a second door: 25 years of service under the plan, whichever comes first. The details, and who counts, are on the public safety page.