Your stop date
When can we stop working?
A year, not a range. Taxes in your state, Social Security, the mortgage and what each of you earns go into one answer, and every line behind it is there to check.
A retirement planner that shows its work
See the year you can stop working and whether the money lasts. Every number comes from what you type, and every assumption shows its source. For one of you or both.
Your stop date
A year, not a range. Taxes in your state, Social Security, the mortgage and what each of you earns go into one answer, and every line behind it is there to check.
Market risk
Your plan is replayed from every start in the market record since 1871, the Depression included, then through ten thousand simulated futures. You see the share that held, and the worst year.
Your choices
Stop two years earlier. Buy the house. Claim Social Security at 67 instead of 70. The answer moves the moment you change it, and you can keep two versions side by side.
The example plan
This is Maya and Theo's plan, the example household, exactly as the app shows it: the age each of them plans to stop, whether the money lasts, and the earliest they could afford to.

Market history
Then ten thousand simulated futures. The number is the share of them where the money lasts. Beside it: the worst year, and how often spending would have had to drop.

Both of you
Two incomes, two stop dates, one plan. When each of you claims Social Security is worked out as a household: the lifetime difference in dollars, and what the survivor keeps if one of you dies first.

Sources
Inflation from the BLS, medical costs from the BLS and CMS, home values from the FHFA and Case-Shiller, Social Security raises from the SSA's own history, market returns from Shiller: cited under the rate they set, and yours to change. When we simplify, we say so.

Before you start
Four things worth knowing before you make an account.
A plan you keep, not a calculator you run once.