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”).
This site uses Cloudflare Web Analytics, a privacy-first, cookieless measurement tool, to count visits and see which pages and referring sites are popular. It sets no cookies, does not track you across other websites, and does not fingerprint your device or collect any personal data — it records only aggregate, anonymous page-view counts. There are no advertising scripts and no other third-party trackers.
Your financial inputs are never measured or transmitted. The analytics beacon only knows that a page was viewed — never anything you type. Everything you enter stays in your browser, as described above.
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 for the calculations themselves — the math even works offline (only the privacy-first analytics beacon, if you’re online, loads from Cloudflare).
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.