where this came from

In 2014 I built a spreadsheet to find out how long my own savings would last.

It became a desktop app, then a web app. The 2014 code is still in the repository, and it is what tests the version running today.

You asked for the link. The planner every chart came from is one tap away; the slides are below if you want them again.

Open the planner Type in one paycheck. About three minutes, in the browser.

Slide 1 of 7: In 2014 I built a spreadsheet to find out how long my own savings would last.

Slide 2 of 7: The whole thing was one window.

Slide 3 of 7: I built it for myself, and then I kept using it.

Slide 4 of 7: Tax was one number you typed in yourself.

Slide 5 of 7: The 2014 app is what tests the one you can open today.

Slide 6 of 7: Same question, more of the answer.

Slide 7 of 7: Save this if you have ever built your own spreadsheet for this.

Where to go next

Retire Plan

Type in one paycheck and it runs your plan through every year of market history since 1871, with the taxes worked out. About three minutes, in the browser.

Open it

Sources: The MATLAB version, 2014. Its backtest panel reads 81 Scenarios Tested.; The Income panel of the 2014 app. The web version reads federal brackets, FICA and state rates from the published tables instead.; The legacy test in the repository, run on every change to the engine. The MATLAB app is kept in references/.; 81 is on the old app's own backtest panel. The web dataset runs 1871 to 2025: Shiller's monthly series, Damodaran for cash..

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