Who inherits your income is decided once, and rarely changes
If you have a pension — federal or state — you choose at retirement whether your spouse keeps receiving income after your death, and at what level. It lowers your own monthly payment, which is why people decline it. Outside a narrow window, that choice can't be reversed.
For federal retirees there's a second consequence that catches families off guard: without a survivor annuity, the surviving spouse generally loses the ability to keep FEHB health coverage too. And if your savings are in a 401(k) or TSP, the beneficiary form on file governs — it overrides your will, and naming someone other than your spouse usually requires their written consent.
Decided once, at retirement