Trust center
Calculation Methodology
The interface, calculation formula and changing rate data are kept separate so that rules can be updated without rewriting the whole tool.
Source order
Official legislation and gazettes come first, followed by FBR, SBP, NEPRA and relevant public authorities. Reputable secondary sources are used only for context or when primary material is unavailable.
Verification
Changing calculators show an applicable period and verification date. Boundary values are tested, including the exact threshold and values immediately above and below it.
Estimates
A calculator result may differ from an official assessment because personal facts, adjustments, exemptions or later legal changes can matter.