https://bir-online-tools.com/blog/tags/dat-files/Recent content in DAT Files on BIR Online ToolsHugoenBIR Online ToolsTue, 17 Jun 2025 00:00:00 +0000https://bir-online-tools.com/blog/posts/welcome/Tue, 17 Jun 2025 00:00:00 +0000https://bir-online-tools.com/blog/posts/welcome/Introducing the BIR Online Tools blog for DAT files, tax forms, and BIR compliance guides.https://bir-online-tools.com/blog/posts/first-excel-conversion/Mon, 15 Jan 2024 00:00:00 +0000https://bir-online-tools.com/blog/posts/first-excel-conversion/How to prepare an Excel file, upload it to the BIR Online Tools converter, map columns, fix validation errors, and download a BIR-compliant DAT file.