How military retired pay is calculated

Military retired pay is one of the few remaining defined-benefit pensions in the American economy, and it is computed by a formula short enough to write on a napkin. Almost everything that goes wrong in estimating it goes wrong not in the arithmetic but in the inputs — in what counts as service, in what counts as pay, and in which of several systems a particular person actually falls under.

This article works through the whole computation. It assumes nothing beyond arithmetic, and it states at each step which figure you must look up rather than assume.

First, establish which system applies

There is no single military retirement system. There are four, three of which are closed to new entrants but all of which still govern people serving or retired today. The one available to you starts with your Date of Initial Entry to Military Service — your DIEMS date — but an authorized REDUX or BRS election is also part of the answer. DIEMS alone cannot prove which multiplier an election-eligible member actually chose.

Members whose DIEMS fell between 2006 and 2017 had a one-time opportunity to opt into the Blended Retirement System during a defined election window. Whether a particular person did is a fact about their record, not something that can be inferred from their DIEMS date alone.

REDUX is not a flat two-percent multiplier. For a regular non-disability retirement below thirty years, start with 2.5% for each completed year and month of creditable service, then subtract one percentage point for every year and 1/12 point for every month short of thirty. That produces 40% at twenty years, 41.75% at twenty years six months, 54% at twenty-four years, and 75% at thirty years. The pre-age-62 reduction does not apply the same way to non-regular Reserve/Guard REDUX, so a regular REDUX calculator must not be reused for that case.

The formula

The exclusion list is not a footnote. For a typical mid-career member, allowances are somewhere between a quarter and a third of what lands in the bank account each month, and none of it enters the pension. This single fact accounts for most of the gap between what people expect their retirement to pay and what it pays.

What “highest 36 months” actually means

It does not mean your last three years, though for most careers those are the same thing. It means the highest thirty-six months of basic pay in your entire service, and the months need not be consecutive.

They usually are consecutive, because basic pay rises monotonically with grade and longevity. The cases where they are not are worth knowing: a reduction in grade, a period of non-pay status, or a member who retires in the same grade they held for years while a January pay raise falls inside the window.

Run the same career under the Blended Retirement System and the multiplier is 40% rather than 50%, giving about $3,660 a month. That is a 20% smaller pension — the trade for the thrift savings match and continuation pay received during the career, which for a member who contributed enough to earn the full match across twenty years can more than close the gap, and for a member who did not, does not.

Creditable service is computed, not counted

The formula’s third input is where careful people still go wrong. Creditable service is a figure held in the personnel system, derived from the pay entry base date and adjusted for anything that does not count. It is not the number of years between two dates you remember.

Things that commonly move it: time in the Delayed Entry Program, which generally does not count; lost time from unauthorized absence or confinement; a break in service; and prior reserve or Guard service, which may count in your favour and may be recorded incorrectly or not at all.

Partial years count, and they count in months. Under current computation, service beyond whole years adds to the multiplier proportionally — twenty years and six months yields 51.25% under the legacy rate rather than 50%. This is the reason a member weighing a separation date should compute the difference rather than assume a few months are immaterial.

For a non-disability retirement after December 31, 2006, the longevity multiplier is not capped at 100%. A legacy member with forty-one creditable years has a 102.5% multiplier. Earlier retirement dates and disability computations have separate limits, so an already-retired or Chapter 61 member should use the rule tied to the actual retirement authority and date rather than this modern longevity illustration.

DFAS rounds the initially computed gross monthly retired pay down to the next whole dollar before later reductions, deductions, withholding and allotments. Calculator cents are useful for showing the formula but are not a prediction of the gross amount on the retiree account statement.

What comes off the top

The formula produces a gross figure. Several things reduce it, and they apply in a particular order that matters for tax.

The Survivor Benefit Plan premium is deducted from retired pay before tax, which makes its effective cost lower than the headline percentage suggests. Election happens before the first payment and doing nothing does not decline it.

A VA waiver. A retiree awarded Department of Veterans Affairs disability compensation must waive an equal amount of retired pay to receive it. This is usually advantageous, because VA compensation is not taxable and retired pay is — but it means gross retired pay and the actual retired-pay deposit are different numbers. Concurrent Retirement and Disability Pay, and Combat-Related Special Compensation, restore some or all of the waived amount for those who qualify.

A former spouse award under a court order, paid directly by the finance service where the marriage overlapped service for at least ten years.

Federal income tax, and state income tax in states that tax military retired pay — a materially different list from the states that tax ordinary income, and one worth checking before choosing where to retire.

The estimate people should distrust

Every retired pay estimate you will encounter, including the one above, shares a set of omissions. Stating them is what separates an estimate from a forecast.

It assumes you serve to the date you planned, in the grade you planned, with no reduction and no early separation. It applies today’s pay tables, so it is expressed in today’s dollars and says nothing about future pay raises. It ignores the interaction between retired pay, VA compensation and taxes, which for a disabled retiree can change the after-tax result substantially in either direction. And it assumes the creditable service figure is correct, which is the assumption most likely to be wrong and the only one you can check for free this week.