Rule of 55 calculator.

The rule of 55 is not a rule about being 55 when you leave. It lets you skip the 10% early-withdrawal tax on money in the plan of the employer you separate from, if you separate from service during or after the calendar year you turn 55 (the year you turn 50 for qualified public safety employees). Leave at 54 in the right calendar year and it works. Roll the same money into an IRA and it stops working.

How the test works

Section 72(t) adds a 10% tax to taxable distributions from a qualified plan before age 59½. One exception covers distributions made after you separate from service after reaching age 55. The IRS describes the timing as separating from service during or after the year you reach age 55, with age 50 for public safety employees of a state or local government in a governmental plan. The calculator takes the year you turn 55 (or 50) and compares it with the year you leave. If you leave in that year or later, the exception can apply to that employer's plan.

It also checks where the money is. The exceptions the IRS lists for this rule are exceptions for a qualified plan other than an IRA, and the separation has to be from the employer that maintains the plan. So money already moved to an IRA, or sitting with an older employer, is not covered. If you leave before the qualifying year, the tool shows the 10% tax and the first date from which a separation would qualify.

The exception removes only the 10% additional tax. Every pre-tax dollar you take is still income and is taxed at your rate. The tool also finds your 59½ date, after which the 10% tax no longer applies to anyone, and counts the months of bridge between your exit and that date.

Worked examples (hypothetical figures, real rules)

Leaving in the year you turn 55. Born August 20, 1971, you turn 55 in 2026. You leave on March 15, 2026, at age 54, and take $50,000 from that employer's 401(k). The separation year equals the qualifying year, so the 10% tax of $5,000 is avoided. Income tax at 22% is $11,000. You turn 59½ on 2031-02-20, about 59 months after you leave.

Leaving one year too early. The same person leaves on December 31, 2025. The separation year, 2025, is before the qualifying year, 2026, so the same $50,000 draws the $5,000 tax. The earliest qualifying separation date is 2026-01-01.

Rolling over first. Move the 401(k) into an IRA and then withdraw at 54, and the age-55 exception no longer applies to that money. Pick the account before you decide the exit date.

Mistakes people make

• Rolling the money to an IRA first. The exception is for qualified plans other than IRAs.
• Counting an older employer's plan. The exception ties to separation from the employer whose plan pays you.
• Thinking the plan must allow it. The tax law excuses the penalty, but your plan still decides whether it permits partial withdrawals after separation.
• Missing the tax return. A 1099-R with code 1 may need Form 5329 to claim the exception.

Who this is for, and what it does not cover

It suits someone leaving a job in their early to mid fifties who needs to draw on a 401(k) or 403(b) before 59½. It does not model the 20% mandatory withholding, state tax, government 457(b) plans (which the IRS says are generally not subject to the 10% tax unless they hold rolled-over money), the 25-years-of-service branch for public safety workers, or firefighters in certain plans. Confirm which category applies with the plan administrator.

Sources

Retrieved 2026-10-26. Each link was opened and checked against the claim next to it.

• IRS: Retirement topics, exceptions to tax on early distributions: the "during or after the year the employee reaches age 55 (age 50 for public safety employees)" wording.
• IRS Topic no. 558: Additional tax on early distributions from retirement plans other than IRAs: the exceptions that apply to plans other than IRAs, the separation requirement and the public safety and firefighter branches.
• 26 U.S.C. 72(t): the 10% additional tax and its exceptions: section 72(t)(2)(A)(v), the statutory exception.