Estate, donor's and capital gains tax computation for one-time transactions. Everything you encode stays on your own computer.
BIR officers invited by the administrator, on a BIR-issued computer, and on real taxpayer data only once the BIR has approved the app through its Information Systems Group and Data Protection Officer (BIR Data Privacy Manual, RMO 1-2020; NPC Circular 2023-06).
What this site records about you: your name and email (to send the invitation), when your code was used, a random install number, a scrambled fingerprint of the computer and its name - to know which invitation activated which copy. Nothing about any taxpayer or docket ever reaches it. Questions or a request to delete your record: write to the administrator who invited you.
C:\, then press Extract. The app lands in C:\EstateTaxPH.
Not in Documents or on the Desktop: on Windows 11 those are usually OneDrive, which would upload your dockets to the internet. The app refuses to start from a synced folder.C:\EstateTaxPH and double-click Start Estate Tax.bat. If Windows warns that it protected your PC, click More info then Run anyway; if it says the publisher could not be verified, click Run.Updating: close the app, then extract the new zip to C:\ the same way and choose Replace the files in the destination. Your dockets, in C:\EstateTaxPH\data, are not in the zip and are not touched.