The Basic Service Requirement for a Federal Pension

You need 5 years of creditable service to receive a federal pension under the Civil Service Retirement System (CSRS) or the Federal Employees Retirement System (FERS). This is the minimum threshold — you cannot receive a pension with less time in federal service, with very few exceptions.

The 5-year requirement applies to most civilian federal employees. Military service can count toward this total if you deposit the required contributions, but the rules for military credit are separate and more complex. Your agency's human resources office can tell you whether your military time counts and what deposit you owe.

Once you reach 5 years, you become vested, meaning you have a legal right to a pension when you reach retirement age — even if you leave federal service before then. You do not have to stay until retirement to own that benefit.

Key Takeaways

  • You must complete 5 years of creditable federal service to earn any pension at all under CSRS or FERS.
  • After 5 years, you are vested and own a pension benefit even if you leave federal employment before retirement age.
  • The age at which you can collect that pension depends on your system (CSRS or FERS) and your age when you started.
  • Years of service also determine the size of your monthly payment — more years means a larger pension.
  • Part-time work counts toward the 5-year threshold, but the calculation depends on your hours and how your agency reports them.

How Service Years Affect Your Monthly Pension Amount

The number of years you work does two things: it gets you to the 5-year vesting point, and it determines how much money you receive each month. The formula is different under CSRS and FERS, but both systems reward longer service with higher payments.

Under CSRS, your monthly pension is roughly 1.5% of your average salary multiplied by your years of service. So 20 years of service at an average salary of $60,000 would yield approximately $18,000 per year (20 × 1.5% × $60,000). Under FERS, the calculation is lower — roughly 1% per year — but FERS includes Social Security, which CSRS does not.

This means the difference between 5 years and 20 years is substantial. At 5 years under CSRS, you would receive about 7.5% of your average salary. At 20 years, you receive 30%. The longer you stay, the larger your monthly check becomes.

Retirement Age Rules for CSRS and FERS

Reaching 5 years of service does not mean you can collect your pension immediately. You also have to reach a minimum age. The age depends on which retirement system you are in and when you were hired.

CSRS employees can retire at age 55 with 30 years of service, or at age 60 with 20 years, or at age 62 with 5 years. If you have fewer than 5 years, you receive no pension — the 5-year threshold is absolute. If you have exactly 5 years but are younger than 62, you must wait until 62 to collect.

FERS employees face different rules based on when they were hired. Employees hired before 2013 can retire at their "minimum retirement age" (MRA) with 30 years of service, or at age 60 with 20 years, or at age 62 with 5 years. Employees hired in 2013 or later have an MRA of 57 and must have 30 years to retire at that age. The 5-year, age 62 option remains available to all FERS employees.

Part-Time and Intermittent Work Counting Toward 5 Years

Part-time federal employment counts toward your 5-year vesting requirement, but the calculation is based on hours worked, not calendar years. Your agency must report your service in a way that tracks actual hours or full-time equivalency.

If you work half-time (20 hours per week), it takes roughly 10 calendar years to accumulate 5 years of creditable service. If you work full-time (40 hours per week), it takes 5 calendar years. Intermittent work — where you are called in as needed — also counts, but only the hours you actually work are credited.

Your agency's payroll or human resources office maintains your service record. You can request a Statement of Service to see exactly how much time has been credited to you. This statement is important to verify before you leave federal service or approach retirement age.

What Happens If You Leave Before 5 Years

If you separate from federal service before completing 5 years, you do not receive a pension. Instead, you can withdraw your own contributions to the retirement fund (the money deducted from your paychecks). Your agency's contributions stay in the federal retirement system and are not returned to you.

If you return to federal service later, your previous time may count again if you are rehired within a certain window and meet other conditions. The rules for this are complex and depend on your specific situation. Contact your agency's retirement counselor or the Office of Personnel Management (OPM) to learn whether your prior service can be restored.

Some employees who leave before 5 years are later rehired and eventually reach the 5-year threshold. In those cases, the earlier service usually counts, but you may owe a deposit to cover the time you were away. Your agency can calculate this for you.

Deposits and Refunds: Money You May Owe or Receive

If you have a break in federal service — for example, you worked for the government, left, and came back — you may owe a deposit to restore your earlier service credit. This deposit covers the employer's contribution for the years you were away. If you do not pay the deposit, those earlier years do not count toward your 5-year threshold or your pension amount.

If you leave federal service after 5 years but before retirement age, you keep your vested pension right. You do not have to do anything to preserve it — the government holds it for you until you reach the age when you can collect. You can also request a refund of your contributions if you prefer, though this forfeits your pension.

The deposit amount varies based on your salary and the length of the break. Your agency's retirement office can provide a specific quote before you decide whether to restore the earlier service.

Frequently Asked Questions

Can military service count toward the 5-year requirement?

Yes, but you must deposit money to buy back the military time. The deposit amount depends on your military rank and length of service. Not all military service is creditable — only active duty generally counts. Contact OPM or your agency's retirement counselor to learn the deposit amount and whether your specific military service qualifies.

If I have 5 years but I'm only 45, when can I collect my pension?

Under FERS, you can collect at age 62 with 5 years of service. Under CSRS, the same rule applies. If you have more service (20 or 30 years), your minimum age may be lower. Check your retirement system and hire date to find your exact minimum retirement age.

Does my pension grow if I keep working after 5 years?

Yes. Each additional year of service increases your monthly pension. The increase is roughly 1.5% per year under CSRS and 1% per year under FERS. Working 10 years instead of 5 nearly doubles your monthly payment.

What if I worked part-time for 10 years — do I have 5 years of service?

It depends on your hours. If you worked 20 hours per week for 10 years, you have roughly 5 years of full-time equivalent service. If you worked fewer hours or intermittently, you may have less. Request a Statement of Service from your agency to see the exact amount credited.

Can I lose my pension if I'm fired or resign?

After 5 years, your pension is vested and cannot be taken away by your agency, even if you are terminated. You own the benefit. If you resign, you keep your pension right and can collect it at retirement age. The only way to lose a vested pension is to withdraw your contributions or commit certain crimes.