FERS and TSP Retirement Planning: How Your Pension and Withdrawals Work Together

Under FERS, federal employees can retire with immediate benefits at their Minimum Retirement Age (MRA) with at least 30 years of service, at age 60 with 20 or more years of service, or at age 62 with at least 5 years of service. The MRA ranges from 55 to 57 depending on birth year. Retirement timing affects pension calculations, FEHB continuation, and long term income flexibility, so the right date is rarely just about eligibility.

MRA+10 refers to retiring at your Minimum Retirement Age with at least 10 years of service but fewer than 30. Under this option, you become eligible to retire and access your FERS pension, but with two differences from a full immediate retirement: your pension is reduced by 5% for every year you are under age 62, unless you postpone the start of your annuity to a later age, and you are not eligible for the FERS Supplement. The MRA+10 path can also affect FEHB continuation. It is one of the more consequential federal retirement choices because the long term cost of the reduction often exceeds what it appears to be in any single year.

To continue Federal Employees Health Benefits coverage into retirement, you generally must have been continuously enrolled in FEHB for the five years immediately before your retirement date, or for the full period of your federal service if less than five years. This is one of the most consequential rules to verify before setting a retirement date, because failing to meet it means losing FEHB coverage in retirement entirely.

Not always. FEHB continues into retirement and provides comprehensive coverage on its own. Medicare Part B, which carries a monthly premium, may reduce out-of-pocket costs depending on which FEHB plan you carry and how the two coordinate. For many federal retirees, the decision comes down to comparing the Part B premium against the potential reduction in cost-sharing under your specific FEHB plan. The right answer depends on your health situation, the plan you hold, and how this fits into your broader retirement income picture.

The FERS Supplement, also called the Special Retirement Supplement, is an additional payment available to FERS employees who retire before age 62 with immediate retirement eligibility. It is designed to approximate the Social Security benefit you would have earned from your federal service, and it continues until age 62 when Social Security eligibility begins. The supplement is subject to an annual earnings test similar to Social Security's. If post-retirement earned income exceeds the threshold set each year, the supplement is reduced by $1 for every $2 earned above the limit. The reduction applies only to earned income — pension, TSP withdrawals, and investment income do not count. The supplement is not available to those who retire under MRA+10 provisions, and it ends at age 62 regardless of when Social Security is actually claimed.

Your Thrift Savings Plan account remains accessible after retirement. You can leave funds in the TSP, take partial or full withdrawals, set up installment payments, purchase a TSP annuity, or roll assets into an IRA or other eligible plan. What matters most is not just access but how and when you draw from the TSP relative to your pension income, FERS Supplement, Social Security timing, and tax situation. Traditional TSP withdrawals are taxable as ordinary income. Roth TSP withdrawals may be tax-free if qualifying conditions are met. The sequence in which you draw from different income sources can affect your tax bracket each year, the taxation of Social Security, and Medicare-related costs years later through IRMAA. Withdrawal timing is rarely a one-year decision.

The FERS basic annuity is calculated using a formula based on your length of service and your high-3 average salary — the average of your three consecutive highest-earning years. For most employees, the multiplier is 1% per year of service. Employees who retire at age 62 or older with at least 20 years of service receive a higher multiplier of 1.1% per year. For example, an employee with 30 years of service and a high-3 average of $120,000 retiring before age 62 would receive approximately $36,000 annually before any survivor benefit elections or deductions.

The FERS pension typically provides a stable base of income beginning at retirement. The broader federal retirement decision landscape shows how each income source begins to interact across time. The FERS Supplement, available to those who retire before age 62, bridges the gap until Social Security eligibility. Social Security then adds another income layer, and TSP withdrawals fill remaining gaps or support larger expenses. The challenge is not understanding each piece individually — it is coordinating when each source activates, how they interact with taxes, and how TSP withdrawals are sequenced so the system can support spending across multiple decades.

The FERS survivor benefit is elected at retirement and the decision is generally irrevocable. Federal retirees can elect a full survivor benefit (50% of the unreduced pension to the surviving spouse, with a 10% reduction to the retiree's pension during their lifetime), a partial survivor benefit (25% to the surviving spouse, with a 5% reduction), or no survivor benefit. The election interacts with FEHB continuation for the surviving spouse — generally, only a surviving spouse who receives some level of survivor annuity is eligible to continue FEHB. Factors that typically matter in evaluating the decision include the age difference between spouses, other income sources available to the survivor, life insurance coverage, the surviving spouse's own retirement assets, and long term healthcare considerations. Because the choice is permanent, it is one of the few federal retirement decisions with no reset option.

IRMAA — the Income-Related Monthly Adjustment Amount — is a Medicare premium surcharge applied to higher-income Medicare beneficiaries. It affects both Medicare Part B and Part D premiums, with the surcharge amount varying by income bracket. The surcharge is based on Modified Adjusted Gross Income (MAGI) from two years prior. This two-year lookback means income decisions made starting around age 63 can affect Medicare costs at 65. For federal retirees, common IRMAA triggers include large TSP withdrawals, Roth conversions, the sale of appreciated assets, and certain pension or Social Security timing choices. IRMAA brackets are recalculated each year by Medicare, and the surcharges are cliff-based rather than gradual — crossing a threshold by even a small amount can move you into a higher premium tier for that year.