# NBR Audit Checker

> Free, privacy-first tool to check whether a 12-digit Bangladesh TIN appears in NBR's officially published Risk-Based Audit Selection list for Assessment Year 2023–24. The lookup runs entirely in the user's browser — TINs are never transmitted.

The site loads a single JSON dataset (92,699 records combining the 49-zone master list, the 8-zone supplementary list, and NBR's Audit Selection V3 2023-24 list) and performs an O(1) hash lookup client-side.

## Pages

- [TIN Checker](/): Enter a 12-digit TIN to check audit selection status.
- [How it works](/how-it-works): Technical explanation of the client-side lookup, privacy model, and analytics.
- [FAQ](/faq): Common questions, limitations, data sources, and privacy details.

## Optional

- [Source code on GitHub](https://github.com/Asif2BD/tin-findr)
- [Author](https://masifrahman.com/)