Updated August 2, 2026. Quick answer: the Blended Retirement System lets you take 25% or 50% of your retired pay as a lump sum at retirement, with your monthly pay reduced until full Social Security retirement age. The reason it is usually a bad trade is not opinion — it is written into the discount formula, which takes a market rate and then adds 4.28 percentage points on top before discounting your money back to today.
How the discount rate is actually set
The regulation lays out the method, and the last step is the one that matters:
“The 7-year average of the 23-year maturity monthly average spot rate taken from the … HQM Corporate Bond Yield Curve … adjusted for inflation … The resulting inflation-adjusted rate is increased by an additional 4.28 percentage points”
DoD 7000.14-R Vol 7B, Ch 3, paras 6.4.1.1-6.4.1.4
Read that as a consumer rather than an actuary. A discount rate is the return the money is assumed to earn if you take it now. Every point added to it shrinks the lump sum you are offered for the same stream of future payments. The add-on is more than four points above an already inflation-adjusted corporate bond rate — so to come out ahead you would have to invest the proceeds and beat that hurdle, after tax, reliably, for decades.
Most people will not. That is not a criticism of anyone’s investing; it is what the formula is designed to ensure.
What you are actually giving up
Three things, and only the first is obvious.
The monthly reduction runs until full Social Security retirement age — for someone retiring at 42, that is a quarter-century of reduced pay, not a few years.
You give up COLA on the portion you cashed out. Military retired pay is inflation-adjusted; a lump sum is not. Over twenty-five years that is the larger loss, and it is invisible at the moment of the decision.
The lump sum is taxable income in the way retired pay would have been, and taking a large sum in a single year can push it through brackets that monthly payments never would have touched.
We are not publishing this year’s rate, deliberately
The actual discount rate is recalculated annually by the DoD Office of the Actuary and published by 1 June for the following January. We verified the method against the regulation. We could not verify the current year’s figure against the official memo that sets it — only against secondary summaries, which is not good enough for a number this consequential.
So there is no lump-sum calculator on this page. If you are being offered this election, the rate that applies to you comes from the current-year memo, and it is worth insisting on seeing it rather than accepting a figure from any website, this one included.
When it might still make sense
Rarely, but not never. High-interest debt that is compounding faster than the discount rate is a genuine case. So is a specific, near-term, non-negotiable need — a house deposit in a market where waiting costs more. What is not a case is the general feeling that a large sum now is worth more than a small sum forever, which is precisely the intuition the formula is built to exploit.
Before deciding: what the full monthly pension actually comes to, and if a survivor election is also in front of you, what that costs and buys — the two decisions interact, because the SBP base amount is measured against retired pay.
Lump-sum election and the discount-rate method from DoD 7000.14-R (Financial Management Regulation) Volume 7B, Chapter 3, paragraphs 6.3 and 6.4. The current-year discount rate is set annually by the DoD Office of the Actuary and is deliberately not quoted here. Read August 2026. General information, not advice.