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Guide · updated 1 Nov 2026

BIR files, made easy.

Guides, a free checker, and the tool behind them.

Short answers to the BIR file problems that waste an afternoon, and a free checker that finds the line that is wrong.

Excel to BIR DAT File: Convert Your List for RELIEFAlready have your sales and purchases in Excel? Save it as CSV, check every line, and get the BIR DAT files for RELIEF, plus the Excel behind them.RELIEF Invalid Characters in a DAT File: How to Fix ItNames and addresses in a BIR RELIEF DAT file must be letters, numbers and spaces. The exact rules, before-and-after examples, and a free checker.RELIEF “Invalid Length in TIN of Owner”: Causes and FixWhat the TIN of owner error means in a BIR RELIEF file, the five usual causes, and how to find the exact line in seconds.BIR 2307 Template, ATC Rates and a Free CheckerKeep your BIR 2307 certificates in one clean list, check every TIN, ATC and amount, and know which quarter each belongs to. Free template included.How to Prepare Your SAWT from 2307 CertificatesTurn a pile of 2307 certificates into a checked SAWT list for your quarterly income tax return, with free AI doing the reading.1604-C and Alphalist from Payroll, Without RetypingGet the 1604-C alphalist numbers straight from your pay runs: what feeds each column, what to fix first, and a ready Excel.SLSP from Receipt Photos with Free AI: Gemini, Grok, ChatGPTMake your Summary List of Sales and Purchases from receipt photos using a free AI and a ready prompt, then check every line before RELIEF.Free BIR DAT File Checker: RELIEF Purchases and SalesDrop in a RELIEF purchases or sales DAT file and get plain answers: bad characters, wrong totals, short TINs. Runs in your browser, nothing uploaded.

The idea

Photograph the papers. A free AI (Gemini, Grok, ChatGPT) reads them with a prompt we give you. ClockIN checks every line, says what is wrong in plain words, and makes the Excel and the files. Payroll forms come straight from your pay runs, with no typing at all.

Questions

Is ClockIN BIR-accredited?

No. Test every file in the BIR’s own validation module before submitting. The filing stays with you and your accountant.

Do I need ClockIN to use the checker?

No. The checker is free, needs no sign-in, and runs in your browser.

Skip the hard part

Photograph the papers. ClockIN checks every line and makes the files.

Try the free checkerOpen File BIR in ClockIN
SLSP from Receipt Photos with Free AI: Gemini, Grok, ChatGPTMake your Summary List of Sales and Purchases from receipt photos using a free AI and a re…How to Prepare Your SAWT from 2307 CertificatesTurn a pile of 2307 certificates into a checked SAWT list for your quarterly income tax re…1604-C and Alphalist from Payroll, Without RetypingGet the 1604-C alphalist numbers straight from your pay runs: what feeds each column, what…

Made by ClockIN, by Strong Media Corp, Metro Manila. ClockIN is not BIR-accredited. Test every file in the BIR’s own validation module before you submit it; the filing stays with you and your accountant. Rules and rates change, so confirm against the BIR’s current issuances.