When you look at a General Schedule (GS) pay table, you are looking at gross basic pay. However, before you even see a dime of that money, the federal government takes a mandatory cut to fund your future defined-benefit pension (the FERS annuity).
Depending on the exact date you were hired into the federal service, your mandatory contribution rate is either a minor inconvenience or a massive chunk of your paycheck. Understanding which tier you fall into is absolutely crucial for accurate retirement planning and cash-flow management.
1. The Three Tiers of FERS
There is no opting out of the FERS basic benefit plan. If you are a covered federal employee, you are paying into the system. However, the amount you pay depends entirely on your "Service Computation Date" for retirement purposes.
Step-by-Step Execution
To figure out exactly how much of your paycheck is being siphoned off for the pension, check your Leave and Earnings Statement (LES) and match your hire date to these three distinct tiers:
Step 1: Original FERS (Hired before January 1, 2013). If you are a veteran of the federal service who entered the system before 2013, you struck gold. Your mandatory contribution rate is just 0.8% of your basic pay.
Step 2: FERS-RAE (Hired between Jan 1, 2013, and Dec 31, 2013). RAE stands for "Revised Annuity Employees." If you were hired during this specific one-year window, your mandatory contribution rate jumped significantly to 3.1% of your basic pay.
Step 3: FERS-FRAE (Hired on or after January 1, 2014). FRAE stands for "Further Revised Annuity Employees." If you joined the federal government from 2014 onward, you bear the heaviest burden. Your mandatory contribution is 4.4% of your basic pay.
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Why the massive discrepancy? The pension payouts at retirement are exactly the same for all three tiers; a FRAE employee does not get a larger pension than an original FERS employee.
The changes were purely political budget mechanisms. The Middle Class Tax Relief and Job Creation Act of 2012 created the RAE tier, and the Bipartisan Budget Act of 2013 created the FRAE tier. Congress required newer federal employees to fund a significantly larger portion of their own retirement annuities to offset government spending deficits.
2. The Cash Flow Impact (The Math)
A jump from 0.8% to 4.4% might not sound massive on paper, but when applied to a six-figure federal salary over a 20- or 30-year career, it represents hundreds of thousands of dollars in lost investable cash flow.
Step-by-Step Execution
When calculating your true take-home pay, you must run the math on your Basic Pay, which includes your locality adjustment but excludes overtime, bonuses, or allowances.
Step 1: The Original FERS Calculation. Imagine a GS-13 making $100,000. An original FERS employee pays 0.8%, meaning exactly $800 is deducted annually (about $30.76 per pay period).
Step 2: The FERS-FRAE Calculation. That exact same GS-13 making $100,000 who was hired in 2015 pays 4.4%. This equals $4,400 deducted annually (about $169.23 per pay period).
Step 3: The Opportunity Cost Analysis. The FERS-FRAE employee takes home $3,600 less per year than their older coworker for the exact same job and the exact same future pension. When mapping out a retirement portfolio, that $3,600 is money that cannot be funneled into a TSP, an ETF, or a real estate venture.
FERS Contribution Calculator
See exactly how much each tier deducts from your specific 2026 GS salary.
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This mandatory deduction is governed by 5 U.S.C. Chapter 84. The funds are deposited into the Civil Service Retirement and Disability Fund (CSRDF). If you separate from federal service before reaching retirement eligibility, you can technically request a refund of these mandatory contributions, but doing so forfeits your right to the future annuity entirely.
Key Takeaways
- 01Hire Date is Everything: Your mandatory pension deduction is locked in based on when you first entered federal service (Pre-2013 = 0.8%, 2013 = 3.1%, 2014+ = 4.4%).
- 02Equal Payout, Unequal Buy-In: FERS-FRAE employees pay 5.5 times more into the system than original FERS employees, but both receive the exact same pension formula calculation at retirement.
- 03Basic Pay Basis: The percentage is deducted from your regular basic pay, including your locality rate.
- 04Investable Cash Flow: When planning aggressive retirement strategies, you must calculate your savings rate based on your net pay after the FERS deduction, as this money is completely locked up in the pension fund.
Official Sources & Further Reading
- OPM FERS Information
The official Office of Personnel Management portal detailing the FERS basic benefit plan.
- OPM Benefits Administration Letter 12-104 (FERS-RAE)
The official guidance implementing the 2012 jump to 3.1%.
- OPM Benefits Administration Letter 14-102 (FERS-FRAE)
The official guidance implementing the 2014 jump to 4.4%.
- 5 U.S.C. Chapter 84
The statutory bedrock establishing the Federal Employees Retirement System.