Nothing. The estimator is a single web page that runs entirely on your device. It has no login, no database, and no back-end that receives your financial information.
Any figures you enter are processed in your browser to compute the estimates. If you click “Save to browser,” they are stored in your browser’s localStorage on that one device so the page remembers them next time. If you click “Download data file,” a file is saved to your own computer. In both cases the data never leaves your machine — we cannot see it, and there is no way for us to.
To erase locally saved data, clear this site’s storage in your browser settings (or use your browser’s “clear site data”).
There are no cookies set by this app, no advertising or analytics scripts, and no third-party fonts or resources loaded. The page is fully self-contained.
The page is served as a static file by Cloudflare Workers. As with any website, Cloudflare may log standard, server-side request metadata (such as IP address and timestamp) for security and reliability, governed by Cloudflare’s own privacy policy. This application stores no user data server-side.
The tool’s calculations use published figures (Social Security wage indexes and bend points, IRS contribution and tax tables, FERS and Medicare rules) that are built into the page itself. No external data is fetched while you use it — it even works offline.
This is a planning estimate for educational purposes, not financial, tax, or retirement advice. Projections rely on assumptions you choose and on rules that can change. For decisions, confirm figures with the authoritative sources — ssa.gov, OPM, tsp.gov — and consider a qualified professional.
If this policy changes, the “Last updated” date above will reflect it. Since no personal data is collected, changes are unlikely to affect you.