I Why this is the most leveraged number you control
The FERS annuity formula has three inputs: High-3 average salary, years of creditable service, and a multiplier of either 1.0 or 1.1 percent. The full mechanics are covered in Benefits Topic 11 on FERS accrual. What matters here is how differently the three behave.
Years of service accumulate at exactly one per year and there is no way to accelerate that beyond buying back prior service. The multiplier is a switch that flips if you separate at 62 or later with 20 years — you either clear the threshold or you do not. High-3 is the only input that responds continuously to career decisions, and because it multiplies the other two, a percentage change in High-3 produces the same percentage change in your entire annuity.
The other reason it deserves attention is that it compounds into places people forget. A higher High-3 raises your basic annuity, which raises the base your COLA is applied to each year, which raises the survivor annuity your spouse receives for life, which raises the amount a full survivor election is worth relative to its 10 percent cost. One number, four downstream effects.
Everything that raises your basic pay in the final 36 months is worth many times the same money paid as a bonus — and everything that lowers basic pay in that window is a permanent annuity cut, not a temporary salary dip.
II What counts as basic pay — and what does not
This is where most of the wasted effort happens. Federal employees chase compensation that feels like a raise and does nothing for retirement.
| Counts toward High-3 | Does not count |
|---|---|
| Base salary from the GS table | Overtime and compensatory time |
| Locality pay | Performance awards and cash bonuses |
| Special rate supplements | Recruitment, relocation, and retention incentives |
| Law enforcement availability pay (LEAP) | Night differential (most GS positions) |
| Certain statutory premium pay for covered positions | Sunday premium, hazard pay, danger pay |
| Retained pay under 5 CFR 536, generally | Travel and per-diem reimbursement |
The most consequential entries on the right side are the incentives. A retention incentive can pay up to 25 percent of basic pay and does not touch your High-3 by a dollar. An employee who accepts a retention incentive instead of competing for a promotion has traded permanent retirement income for temporary cash. That is sometimes the right call — cash now has real value — but it should be a decision, not an accident. The incentive mechanics are covered in Topic 15 and award treatment in Topic 16.
III The 36-month window and how OPM finds it
Your High-3 is the average of your highest 36 consecutive months of basic pay. Two details carry all the weight.
Consecutive, not calendar. The window runs continuously and does not align to fiscal or calendar years. It can start in the middle of a month. OPM computes it by weighting each rate of basic pay by the exact number of days it was in effect.
Highest, not last. The window can come from anywhere in your career. OPM finds the 36 consecutive months that produce the highest average and uses those. You do not have to identify the period yourself, and you cannot choose a different one.
That second point is a genuine protection for employees whose pay fell late in a career — a downgrade, a move to a lower-locality duty station, a term appointment at reduced pay. An earlier high-water period still governs. But it is a weak protection, because pay generally rises over a career: for the large majority of employees the highest 36 months are simply the last 36, and an earlier window only wins if the late-career drop was steep.
Separate on a date that completes a full month of service. OPM drops odd days beyond a full month from the service computation entirely — they do not round up. On a $120,000 High-3 with the 1.1 percent multiplier, a discarded 20 days is worth about $220 a year, for life, given away for nothing.
IV Lever one — locality pay
Locality is the largest single lever available to most federal employees, and it is the one people are least likely to think of as a retirement decision.
In 2026 there are 58 locality pay areas — 57 named areas plus the catch-all Rest of U.S. The differentials run from 17.06 percent in Rest of U.S. to 46.34 percent in San Jose-San Francisco-Oakland, a spread of more than 29 percentage points. Because locality is applied to base pay and the result is basic pay, that entire spread flows into the High-3.
A note specific to this year: the 2026 pay adjustment was a 1.0 percent across-the-board increase to base rates only, with every locality percentage held at its 2025 level. Employees who normally see a locality bump on top of the base raise did not get one in 2026, which makes the differential between areas a static rather than widening gap for the moment.
What a late-career locality move is actually worth
A GS-13 Step 7 with a base rate near $110,600 earns roughly $129,500 in the Rest of U.S. area at 17.06 percent. The same grade and step in the Washington-Baltimore area at 33.94 percent earns roughly $148,100.
Sustained across all 36 months, that raises the High-3 by about $18,600. At 30 years of service and the 1.1 percent multiplier, the annuity rises by $18,600 × 30 × 1.1%.
The reverse is equally true and considerably more common. Employees who relocate to a lower-cost area in their final years — often for family reasons, often thinking of it as a lifestyle choice rather than a financial one — permanently reduce their annuity. If the move is going to happen anyway, the cheapest time for it is after you separate, not before. The duty-station mechanics are covered in Topic 22, and the telework and remote-work rules that determine which locality rate you are actually paid are in Topic 21.
One ceiling to be aware of: GS locality-adjusted pay is capped at Executive Schedule Level IV, $197,200 in 2026. Senior GS-15s in high-locality areas hit that cap, which means additional locality does not raise their basic pay and therefore does not raise their High-3.
V Lever two — promotion timing
A grade promotion is usually the largest discrete jump available, and its retirement value depends almost entirely on when it lands relative to your 36-month window.
A promotion that takes effect at the start of the window is reflected in all 36 months. The same promotion landing 18 months in is reflected in half of them, and contributes roughly half as much to the High-3. A promotion in your final month contributes about one thirty-sixth of its value.
This is why the planning horizon is five years rather than three. Competing for and landing a promotion takes time — announcements, referral, interviews, security processing, effective date. Starting that process two years before your window opens means the promotion is fully baked in. Starting it two years before you retire means capturing perhaps a third of its value.
Promotion pay is set by the two-step rule under 5 CFR 531.214, which is the mechanic that determines your new rate and is worth understanding before you accept an offer. That is covered in Topic 39, and the competitive-versus-noncompetitive distinction in Topic 07.
VI Lever three — within-grade increases and the QSI
Step increases are smaller than promotions but they are close to automatic, which makes their timing predictable and therefore plannable.
| Advancing to step | Waiting period |
|---|---|
| 2, 3, 4 | 52 weeks |
| 5, 6, 7 | 104 weeks |
| 8, 9, 10 | 156 weeks |
Each step is roughly 3 percent of base pay within a grade, and it requires only an acceptable level of competence rather than a competition. Because the waiting periods are known, you can map exactly which increases will land inside your High-3 window and which will fall just outside it — and that occasionally argues for shifting a retirement date by a month or two.
A Quality Step Increase is the accelerator. A QSI advances you one additional step for high performance and does not restart the full waiting period, so it effectively pulls your entire remaining step schedule forward. Granted three years before retirement, a QSI is worth its salary value for those three years plus a permanently higher High-3 plus the annuity that flows from it for life. Employees routinely undervalue this when their supervisor is deciding between a cash award and a QSI — the QSI is worth far more to anyone within striking distance of retirement, and it costs the agency less. The step and QSI mechanics are in Topic 03.
VII Lever four — special rates and pay retention
Two narrower mechanisms round out the picture, and both count as basic pay.
Special rate schedules raise pay for occupations where the government has recruitment or retention difficulties — many IT, medical, engineering, and acquisition series carry them. A special rate supplement counts toward High-3. Employees sometimes do not realize their series is eligible, or that a series change into a special-rate occupation carries a permanent retirement benefit beyond the salary bump. See Topic 05.
Pay retention under 5 CFR 536 protects your rate when you are involuntarily moved to a lower-graded position through a RIF, reorganization, or classification action. Grade retention preserves your grade for up to two years; pay retention preserves the rate afterward. Retained pay generally counts as basic pay for High-3 purposes, which means an employee downgraded involuntarily may keep their annuity base largely intact. An employee who accepts a lower-graded position voluntarily gets none of this protection. That distinction is worth understanding before you agree to anything during a reorganization — see Topic 36.
VIII High-3 Optimizer
Model your final 36 months. The tool projects your High-3 under your current trajectory, applies whatever changes you plan inside the window, and converts the difference into annual annuity dollars.
What is your High-3 actually going to be?
Enter your current basic pay and what you expect to change during the 36 months before you separate. The tool weights each change by how much of the window it covers.
Same Promotion, Three Different Timings
Resulting High-3 for an employee at $129,500 receiving an identical 10 percent promotion, depending on whether it takes effect before the 36-month window opens, halfway through it, or in the final months. The promotion is the same; only the timing differs.
IX Why a raise beats an award, quantified
This is the comparison worth internalizing, because supervisors present these as equivalent recognition and they are not remotely equivalent.
$6,000 two ways, for an employee three years from retiring
As a performance award: $6,000 paid once, taxed as supplemental wages. Nothing flows to the High-3. Retirement value: zero.
As a $6,000 raise to basic pay: $18,000 in additional salary across the three years, plus a High-3 roughly $6,000 higher. At 30 years of service and the 1.1 percent multiplier, the annuity rises by $6,000 × 30 × 1.1% = $1,980 per year.
None of which means awards are worthless. Cash now has genuine value, particularly earlier in a career when the High-3 window is decades away and the money can be invested. The point is narrower: for an employee inside or approaching their final 36 months, the two are not close, and the conversation with your supervisor should reflect that. A QSI in place of a cash award is frequently available, costs the agency less, and is worth multiples more to you.
X The late-career mistakes that cost the most
| Mistake | What it costs |
|---|---|
| Relocating to a lower-locality duty station in the final three years | The full locality differential, permanently, in every annuity payment |
| Accepting a voluntary downgrade near retirement | No pay retention protection applies — basic pay simply drops |
| Taking a retention incentive instead of competing for a promotion | Temporary cash in place of permanent annuity base |
| Moving to a part-time schedule late in a career | Proration applies to the whole career, not just the part-time years |
| Separating mid-month | Odd days are dropped entirely from the service computation |
| Extended LWOP inside the window | More than six months in a calendar year is not creditable service |
| Chasing overtime instead of base pay | Overtime never touches the High-3 |
| Starting the promotion process two years out | Captures a fraction of the promotion's High-3 value |
XI Part-time, LWOP, and other complications
Part-time service. OPM computes your High-3 as though you had worked full time during part-time periods, then applies a proration factor to the annuity based on the ratio of hours actually worked to full-time hours across your career. So part-time work does not depress the High-3 average — it reduces the annuity proportionally. The trap is that the proration is career-wide, so a few late years of part-time work dilute a full career of full-time service more than people expect.
Leave without pay. Generally creditable for up to six months per calendar year without any payment. Beyond that it is not creditable service, and extended LWOP inside your High-3 window complicates the computation. Military LWOP is treated as military service rather than civilian and follows the buyback rules instead.
Details and temporary promotions. A temporary promotion raises basic pay while it is in effect and that higher rate counts toward High-3 for those months. A detail at the same grade does not change your pay and therefore does not affect it. A long temporary promotion overlapping your window is genuinely valuable — see Topic 38.
The pay cap. Employees at Executive Schedule Level IV, $197,200 in 2026, have already hit the ceiling. Additional locality does not raise their basic pay, so locality-based strategies do not apply to them.
XII The five-year playbook
| Time before separation | What to do |
|---|---|
| 5 years out | Start competing for promotion. Request a desk audit if your duties exceed your grade. Explore a higher-locality duty station. This is when the big levers are still available. |
| 4 years out | Position for a QSI. Map which within-grade increases will land inside the window. Confirm whether your series carries a special rate. |
| 3 years out | The window opens. Everything in place now counts for all 36 months. Lock in any duty station change before this point. |
| 2 years out | Protect. Decline voluntary downgrades and lower-locality moves. Push for base pay over cash awards. |
| 1 year out | Verify your Service Computation Date for retirement — not the SCD for leave. Model retirement dates against step-increase eligibility. |
| Final months | Choose a separation date that completes a full month. Confirm your High-3 estimate against your own LES history. |
What to verify this quarter
- Pull three years of LES records and compute your own High-3. Do not wait for an agency estimate to discover a surprise.
- Confirm your Service Computation Date for retirement on your SF-50 — it differs from the SCD for leave and people quote the wrong one constantly.
- Identify which within-grade increases fall inside your projected 36-month window and which land just outside it.
- If your duties have grown beyond your position description, request a desk audit — reclassification raises basic pay permanently.
- Check whether your occupational series carries a special rate schedule you are not being paid under.
- If a duty station change is coming, move before the window opens if it raises locality, and after you separate if it lowers it.
- When a supervisor offers a cash award, ask whether a QSI is available instead. It costs the agency less and is worth multiples more to you.
- Never accept a voluntary downgrade inside the window — voluntary moves get no pay retention protection.
- Model your separation date to complete a full month of service. Odd days are discarded.
- Run the result through the High-3 Estimator and the 2026 GS Pay Calculator to confirm the figures against the current tables.
Frequently asked questions
Basic pay only, which means base salary plus locality pay. It also includes special rate supplements, law enforcement availability pay, and certain statutory premium pay for covered positions. It excludes overtime, bonuses, performance awards, recruitment and relocation and retention incentives, night differential for most General Schedule employees, Sunday premium, hazard pay, danger pay, and any travel reimbursement. The practical consequence is that a $10,000 annual performance award adds nothing to your retirement, while a $6,000 raise sustained through your High-3 window adds to every annuity payment for the rest of your life.
No. It is your highest 36 consecutive months of basic pay, which is usually but not always the final three years. The months must be consecutive and they do not have to align to calendar years, but they can come from any point in your career. If you took a downgrade, moved from a high-locality area to a lower one, or accepted a term or part-time position late in your career, an earlier 36-month window may produce a higher average. OPM computes the window that yields the highest figure, so you do not have to identify it yourself.
Enormously more, if it lands inside your High-3 window. A $6,000 raise sustained through all 36 months raises your High-3 by roughly $6,000. At 30 years of service and the 1.1 percent multiplier, that adds about $1,980 per year to your annuity, permanently, with cost-of-living adjustments on top, and it also raises the base your survivor annuity is computed on. A $6,000 award is $6,000 once, taxed as supplemental wages, and contributes nothing to retirement. For anyone within three years of retiring, negotiating base pay over a one-time payment is not close.
Yes, and it is the single largest lever available to most employees, because locality differentials span from 17.06 percent in the Rest of U.S. area to 46.34 percent in the San Jose-San Francisco-Oakland area in 2026. Moving from Rest of U.S. to a high-locality area for the final 36 months can raise basic pay by roughly a quarter, and that increase flows directly into the High-3. The move must be genuine and sustained for the full window to capture the whole benefit, and the arithmetic runs just as hard in reverse: relocating to a lower-locality area within three years of retiring permanently reduces your annuity.
Yes. Within-grade increases raise basic pay and therefore feed directly into the High-3. The waiting periods are 52 weeks for steps 2 through 4, 104 weeks for steps 5 through 7, and 156 weeks for steps 8 through 10, assuming an acceptable level of competence. A Quality Step Increase advances you an extra step without resetting the full waiting period, effectively accelerating your timeline. Because the value of a step compounds through the High-3 window and then through every year of retirement, a QSI granted three years before retirement is worth far more than its face value in salary.
It depends on whether pay retention applies. If you are involuntarily reduced in grade through a reduction in force, reorganization, or classification action, grade retention may preserve your grade for up to two years and pay retention may preserve your rate afterward, and retained pay generally counts as basic pay for High-3 purposes. If you voluntarily accept a lower-graded position, no such protection applies and your basic pay simply drops. Because OPM uses your highest 36 consecutive months, an earlier higher-paid window may still govern your annuity — but only if the earlier period was genuinely higher.
OPM computes the High-3 as though you had worked full time during part-time periods, then applies a proration factor to the resulting annuity based on the ratio of hours you actually worked to full-time hours across your career. The effect is that part-time work reduces the annuity proportionally without depressing the High-3 average itself. Employees who move to a part-time schedule late in a career should model this carefully, because the proration is applied to the whole career rather than only to the part-time years.
Five years before your target retirement date, which gives you roughly two years of runway before the 36-month window opens. That is enough time to compete for a promotion, request a desk audit or reclassification, position for a Quality Step Increase, or arrange a duty station change and have it be fully reflected across the entire window. Once you are inside the final 36 months, most of the large levers are gone and you are limited to protecting what you have — chiefly by not accepting a downgrade, a lower-locality duty station, or a part-time schedule.