Standard Form 3108 at a glance
What it is: Standard Form 3108, Application to Make Service Credit Payment, is a Federal Employees Retirement System form of the U.S. Office of Personnel Management.
Who signs: Sign at 13. Signature of applicant.
You should use this application if you are covered by the Federal Employees Retirement System (FERS) and you want to pay for civilian service so that you can receive retirement credit for the service.
Use this application even if you transferred to FERS and want to pay for service which will be credited under Civil Service Retirement System (CSRS) rules.
If you are not currently working as a Federal employee under FERS, but you had been covered under FERS and had at least 5 years of paid creditable civilian service at the time you left FERS covered employment, you may also use this application to pay for additional unpaid civilian service that you performed.
You should also use this application to pay a deposit for your military service performed after December 31, 1956, if you are currently in a position covered by FERS.
If you are under the Civil Service Retirement System, use Standard Form 2803, Application to Make Deposit or Redeposit, to apply to pay for service.
A filled-in Standard Form 3108 example: a federal employee pays for a 1986 period of service
How to fill out Standard Form 3108, box by box
Name and List other names
Enter your Name (Last, first, middle). If you have used other names, List other names you have used.
Birthdate and Social Security Number
Enter your Birthdate (mm/dd/yyyy) and your Social Security Number.
Address (Number and street)
Enter your Address (Number and street) and (City, state and ZIP Code).
Department or agency, Location of employment and Title of position
Enter the Department or agency in which presently or last employed, including bureau, branch, or division, the Location of employment (city and state) and the Title of position.
Have you previously filed any application
Mark Yes, complete items 9a and 9b, or No, for any application previously filed under the Federal Employees Retirement System (FERS) or the Civil Service Retirement System (CSRS).
For 9b, enter the Claim number(s) [if available].
I am applying to make a service credit payment for
Mark Civilian Service (Complete item 10) or Military Service (Go to item 11) when you are applying to make a service credit payment.
Periods of Service
List in chronological order all periods of Federal civilian service. Be sure all your service is listed so that the Office of Personnel Management (OPM) can bill you for the correct amount.
Put a check mark in the boxes next to the periods of service you want to pay for. (If you do not want to pay for a specific period of service, leave the box blank.)
Check whether deductions were not withheld, withheld and refunded, or withheld and remain to your credit.
Are deductions now being withheld and the date of separation
Mark Yes (Go to item 13) or No (Go to item 12) for Federal Employees Retirement System deductions now being withheld from your salary. For No, Give the date of separation from your last position under the Federal Employees Retirement System.
Signature of applicant, Telephone number, E-mail address and Date
Enter the Telephone number (including area code) where you can be reached during the day and the Date (mm/dd/yyyy).
Enter your E-mail address.
Part B, to be completed by the employing agency
Complete Part A in full. If you are currently a Federal employee, have your employing agency complete Part B.
Part B Certification - The information entered is based on official records of this agency and is correct. There is no official personnel or fiscal record in this agency of the additional service (if any) alleged by the employee and marked unverified in item 3.
More rules for Standard Form 3108
Payment is optional. You do not have to pay if you do not want to do so.
You must pay the total amount due for each separate period of service before you can receive credit for it in your annuity.
Instructions for making payment, together with a bill for the amount due, will be sent to you as soon as OPM processes your application.
Failure to furnish the requested data will delay or prevent action on this application.
Send, attach and pay in installments
You are a Federal employee
If you are a Federal employee, send your completed application to your department or agency because they must certify it.
Please do not file an application if you plan to retire within six months. OPM will give you an opportunity to make payment when it computes your annuity.
You are not currently a Federal employee
If you are not currently a Federal employee, send your completed application directly to: Office of Personnel Management Retirement Operations Center P.O. Box 45 Boyers, PA 16017-0045.
You worked more than your official tour of duty
If you worked more than your official tour of duty, attach a statement with the name of the agency where you worked, the beginning and ending dates of each period of service, your grade and job title, and the number of hours worked per week.
You make installment payments
Installment payments of at least $50.00 are acceptable (checked November 8, 2026).
However, since interest is charged on the unpaid balance, you have to pay additional interest if you make installment payments.
Common questions about Standard Form 3108
Is there a deadline?
Payment by you or your spouse must be completed before final processing of retirement or survivor benefits.
Are there fees?
The amount of the deposit payment for most civilian service is 1.3 percent of your basic pay for the service, plus interest. The 1.3 percent rate applies regardless of whether deductions would have been taken at that rate, if they had been taken at the time the service was performed.
When is this form not the right one?
You cannot pay a civilian deposit/redeposit for: Any period of service under FERS for which you received a refund of your retirement deductions based on an application you filed after you had been covered by FERS, if you were not employed under FERS on or after October 28, 2009. Temporary or intermittent service which you performed after 1988, unless a deposit is allowed by a special provision of law. Temporary service means an appointment which is limited to one year or less. Intermittent service means an appointment with no scheduled tour of duty. Any other service which is not creditable under FERS.
Sources
[1] Standard Form 3108 (Revised June 2013), Application to Make Service Credit Payment, U.S. Office of Personnel Management (the Official source link on this page).