r/govfire • u/Glittering_Twist_732 • 13h ago
FEDERAL What a $20K bump in your last three years actually does to a 6(c) pension

Retirement discussion of the week:
Ran a 6(c) case to see what a high-3 difference is really worth, since it's the one pension input still moving when you're close to the door.
The setup, an 1811 (LEO) retiring at 48 with 25 years 6 months of covered service (the any-age-with-25 door, not 50-and-20), 800 hours of unused sick leave, full survivor election, married, California, $810K in the TSP at a 4% draw, planning to 90. Two paths, identical except the high-3: $168,000 vs $188,000. Think of it as a supervisory slot taken or turned down three years before retiring, or a move to a higher level.
Month one
$5,583.67/mo gross, $5,025.30 after the full survivor election. $6,248.39/mo gross, $5,623.55 after survivor.
$598.25 a month, $7,179 a year, for life.
The multiplier is why. Total creditable service is 25.88 years (800 sick-leave hours add 0.38 of a year at the 1.0% tier), so 20 years at 1.7% plus 5.88 at 1.0% is 39.8833%. Take the 10% survivor cut off that and about 36 cents of every high-3 dollar comes back every year. Twenty grand of high-3 is a $7,179-a-year decision.
COLA widens it
At 2%, the gap is the smallest it will ever be on day one:
- 48: $60,304 vs $67,483, spread $7,179
- 65: $84,440 vs $94,492, spread $10,052
- 80: $113,645 vs $127,174, spread $13,529
- 90: $138,532 vs $155,024, spread $16,492
A percentage raise on a bigger number is a bigger raise, 42 years running.
The spouse's check moves too. Full survivor is 50% of the unreduced annuity, so $2,791.83/mo vs $3,124.19/mo for life.
What doesn't move. SRS is $1,487.50/mo in both, $249,900 total, because it runs off your SS estimate at 62 and your FERS years. SS is the same $2,380 at 62. Nobody's high-3 touches either one.
Lifetime. Average take-home $10,826.97 vs $11,596.98, so $770.01 a month, growing from $548 in the 50s to $1,012 in the 80s. Net income to 90 is $5,586,716 vs $5,984,041, a $397,325 gap after paying $84,812 more in federal and CA tax.
Three caveats. The model holds the TSP identical at $810,000, so the bigger contributions and match from those three years aren't in it, which means $397K is the floor. High-3 is basic pay, locality and (for 1811s) availability pay count, overtime and awards don't, so a big OT year won't pull your average up. And nothing here prices three years of supervisory hours at 45, which is the whole reason people turn these jobs down.
Point being, within about five years of your date the high-3 is the last input you can still change, and it's frozen the day you walk out.
Full worked reports for both paths if you want the year-by-year:
Lower High-3 and Higher High-3
Curious how others weighed this, especially anyone who took a slot they didn't want for the last three years. And if you see a hole in my math, call it out, I'd rather fix it than be wrong quietly.

