The moment I realized most federal agents don't actually understand their own retirement was about sixteen years ago. I was a new 1811 going through the Criminal Investigator Training Program at FLETC in Glynco. One of our instructors was visibly stressed. Short-tempered, bad mood most days. After an exam one afternoon, a few of us stood around talking to him, and he opened up about what was eating at him.

He was 56 years old, fast approaching 57. That's the mandatory retirement age for every criminal investigator in the federal government. Absent a waiver, every 1811 gets forced out at 57, whether the math works for them or not.

That conversation stuck with me. It made me realize I had to understand my own numbers, and that the window to fix a misunderstanding about your retirement is before you're inside the five-year runway to it. Not after.

Most agents never open that window. They run their first serious calculation with two or three years to go, discover something they've been assuming for a decade is wrong, and then make the biggest financial decisions of their life under pressure.

This post is the math nobody sits you down and explains.

6(c) refers to the enhanced retirement provisions for federal law enforcement officers, firefighters, and air traffic controllers under FERS. But not every federal LEO gets it. Job series 1811 (criminal investigators) are covered. So are Federal Air Marshals, and certain components inside ICE, including 1801-series ERO officers. Positions that look like law enforcement aren't automatically covered. Secondary coverage rules and small administrative details in the position description are where people get caught.

Two things make 6(c) "enhanced": earlier eligibility and a richer multiplier. Everything else in this post is downstream of those two facts.

The age and service combinations are simple:

Come in at 30, you're eligible at 50. Come in at 25, you need to go 25 years to retire at 50. Come in at 22, you could retire at 47 under the 25-and-any-age rule.

Mandatory retirement is 57, with waivers available for certain veteran preferences and agency needs. They're not guaranteed.

MRA +10 is a general FERS provision that lets you retire with an immediate annuity if you've hit your Minimum Retirement Age (56 or 57 depending on birth year) and have 10 years of service. It sounds generous. For a 6(c)-covered LEO, it's almost always a mistake.

Here's why. Under MRA +10, you take a 5% permanent annuity cut for every year you're under 62. That's a 25% cut if you go at 57. Forever. You also lose the enhanced 1.7% multiplier and get computed under standard FERS at 1.0% per year. And you lose the FERS Annuity Supplement entirely. Agents get burned out, Google "earliest I can retire," see MRA +10, and pull the trigger. They walk out with an annuity 30-40% smaller than it needed to be. If you're 6(c)-covered and don't have 20 years yet, hold. The math isn't close.

This is where the math nobody explains really starts.

Your High-3 is the average of your three consecutive highest-paid years. Any 36 consecutive months in your federal career. Not calendar years. Not necessarily your last three.

Here's the mistake I see constantly: someone estimates their High-3 off the gross pay on their W-2 and comes in thousands high. Their W-2 includes premium pay that doesn't count. The number their whole retirement plan rides on is wrong.

One more detail buried in this calculation: it runs on months, not years. Say you're a GS-13 Step 9, you get promoted to Step 10, and you retire less than a year later. Only the actual months you spent at Step 10 blend into your High-3. Not a rounded-up year. If you want that promotion to count fully, you need those 36 months.

The strategic implication: your last three years matter enormously. Promotion timing, step increases, and locality moves all compound. I've watched agents take a final three-year posting in a high-locality area like DC, San Francisco, or New York, specifically to max out their High-3. It's not something I'd do personally. Moving a family across the country for the last stretch of a career is a lot. But for agents whose kids are grown and whose circumstances allow it, the strategy works.

Under 6(c), your first 20 years of covered service accrue at 1.7% per year. Every year after that accrues at 1.0%.

At 20 years, you've already earned 34% of your High-3. Every additional year past that only adds 1%. So the classic "one more year" question has a very different answer at year 20 versus year 25.

And don't burn your sick leave on the way out. Unused sick leave converts to extra service credit at 2,087 hours per year and tacks onto the back end of your retirement. Burn 1,200 hours in your final months and you're leaving months of annuity behind for no reason.

Let's make this concrete. Assume a GS-13 Step 8, 1811, in the DC locality, retiring in 2026 with 22 years of covered service.

Multiplier: 20 years × 1.7% = 34%, plus 2 years × 1.0% = 2%. Total: 36%.

Annuity calculation: $187,754 × 36% = $67,591 per year, or about $5,633 per month, before any survivor benefit election or tax withholding.

And that's just the annuity. There's another piece most people don't understand.

The FERS Annuity Supplement is a bridge payment that approximates the Social Security you've earned through your federal service. It's paid from retirement until age 62, when Social Security itself becomes available.

The key: under 6(c), you receive the supplement immediately at retirement. Regular FERS retirees don't get it until their MRA. Retire at 50 and you collect the annuity and the supplement starting on day one.

There's a catch most people don't hear about until it's too late. An earnings test kicks in at MRA. If you're earning W-2 income above the Social Security annual limit after MRA, roughly 50 cents of every dollar over the limit is clawed back out of your supplement. Sign a contractor offer without planning around this and you can give most of it back. The full mechanics are a future post.

Here's the part that's pure gold and almost nobody talks about it: between age 50 and your MRA, roughly six to seven years for most 6(c) retirees, there is no earnings test. You can make as much money as you want, doing anything you want, and still collect the full annuity and full supplement. That window is the single biggest structural advantage of enhanced retirement, and most people don't know it's there.

Retirement income isn't one number. It's a stepped curve, and every step has a decision attached to it.

Each of those transitions is a decision point. When to file for Social Security. Whether to draw from TSP. How to structure contractor income around the earnings test. The agents who retire well are the ones who see the whole curve before they leave.

1. Estimating High-3 off gross pay. Your High-3 is base + locality + LEAP, computed over 36 consecutive months. Pull the right numbers from the right pay stubs, not the bottom line of your W-2.

2. Trusting the OPM retirement estimate. OPM's estimates are often months out of date and use stale pay data. Don't treat any estimate as truth, whether it comes from OPM, your agency HR, or a calculator. Do your own math. Verify everything.

3. Leaving before you have to. MRA +10 with fewer than 20 years of covered service is almost always the wrong move. And even if you're fully eligible, remember the age-50-to-MRA window: you can earn unlimited income and still collect your full annuity and supplement during that stretch. That changes the "one more year" conversation entirely.

We all make our own calls about when, where, and how to retire. Max the TSP or not. Buy back military time or not. Retire the day you hit 20 and spend the next six years earning unlimited contractor income on top of the pension. Those are personal decisions, and they depend on your numbers, your family, and your circumstances.

But this is the rest of your life. Take the time. Plan it out. Verify every assumption. Don't drift into retirement based on a hallway conversation or an OPM estimate you didn't check.

We have something most working Americans don't. A three-tier retirement system of an annuity, a TSP, and Social Security. Used well, it's a generational opportunity. Used badly, it's a lot of money left on the table.

Future posts in this series go deeper on each piece: the military buyback math, the supplement earnings test, the TSP reallocation question approaching 50, and the full contractor pipeline. Subscribe and you won't miss any of it.

LR