How does the Rule of 55 work?
It's the calendar year that counts, not your birthday. If you turn 55 at any point in the year you leave your job — even in December, and you left in January — withdrawals from that employer's plan are free of the 10% penalty from then on. (IRS: exceptions to tax on early distributions)
| Born | Leave in | Turn 55 that year? | Penalty-free? |
|---|---|---|---|
| 1971 | 2025 | No (54) | No |
| 1971 | 2026 | Yes | Yes |
| 1971, firefighter | 2021 | Turns 50 | Yes (age-50 rule) |

Rule of 55 401(k): What Counts and What Does Not (IRAs Don't)
The exception covers only the plan of the employer you just left. It doesn't follow your money anywhere else, and it never applies to IRAs. Income tax is still due on every dollar (IRS Topic 413).
| Account | Penalty-free under the Rule of 55? |
|---|---|
| 401(k) or 403(b) of the employer you left | Yes |
| Plans from earlier jobs | No — unless rolled into this plan before you left |
| IRA, including a rollover IRA | No |
| Governmental 457(b) | No penalty at any age after you leave |

Our take: don't roll it over at 55
Many people roll their 401(k) into an IRA the week they retire. If you might need the money before 59½, that move turns penalty-free money into penalized money. Leave it in the plan, take what you need, and see what you keep on the 401(k) withdrawal tax calculator. Not 55 yet? The early withdrawal penalty calculator lists the other exceptions, and the how long will my money last calculator tests an early retirement.