Methodology
How the calculators work
Every calculator on AyTool is a pure function over a versioned rule file. The rules — rates, salary brackets, floors, ceilings, multipliers, holiday lists — live in structured data files transcribed manually from the official issuance (a circular, advisory, revenue regulation or proclamation), never from other calculator websites. The calculation code contains no numbers of its own; when a rate changes, we update the data file, its verification date, and nothing else.
Where every number comes from
Verification practice
- Before publication, each engine's output is checked line-by-line against the official schedule for every member type, including floor and ceiling edge cases.
- Rules are re-verified on the official update cycle: SSS/PhilHealth/Pag-IBIG each December–January, holiday proclamations each Q3–Q4, the 13th month rules each October, PRC's calendar each November, and the BIR table whenever revenue regulations change.
- Every result card and page shows the schedule used, its effective date, the verification date and a link to the official source — so you can always check our work.
What the results are (and aren't)
Results are estimates of the statutory minimums and standard schedules. Your payslip can legitimately differ — company policies more generous than the law, retroactive adjustments, loans, or special arrangements. For anything binding, rely on your employer's payroll and the government agency's own records. See the Disclaimer.
Corrections
If any figure here disagrees with an official source, email contact@aytool.com with a link to the issuance. Verified corrections are published as fast as we can build the page.