VAT Tax Invoice Completeness Checker (UAE)

Your input VAT claim depends on holding a proper tax invoice, and customers and auditors can refuse an invoice with something missing. A missing or malformed TRN, a total that does not add up, an invoice issued weeks after the supply, a number used twice: today these are found by eye, after the fact.

This is a working offline app, one HTML file you open by double-clicking. Type or paste the fields of one invoice, or import a CSV of many from your accounting system. It checks each against a list of required elements, gives a score and lists what is missing or inconsistent.

What is inside

• A single-invoice form with a live score and a pass or fail line for every element.
• A batch mode: import a CSV (template and a 12-invoice sample with deliberate defects included), see score, status and the problems for each invoice, export the results as CSV, print them.
• A configurable list of required elements with a switch per profile (Standard tax invoice, and a Simplified or other profile you set up). Rename items, add your own on extra fields, remove what you do not need.
• Built-in checks: the words tax invoice, supplier name, address, TRN of exactly 15 digits, a sequential or unique number, issue within the allowed number of days of the supply (14 by default, a setting), VAT equals taxable amount times rate, total equals taxable plus VAT, and no repeated invoice number in a batch.
• Every rule is shown, and the README works through an example with the real numbers.

What is fact and what is a setting The core particulars and the 14-day rule follow the FTA tax invoice page as recorded in the Zeyto Academy fact check, and the README says to verify them with the FTA. Other commonly expected elements are labelled as common elements to confirm with the FTA. Simplified invoice rules changed under Cabinet Decision 100 of 2025, so the Simplified profile is a list you configure, not a rule the app states.

How it was checked Scores and failure lists were compared with an independent Python calculation over 25 random cases of 8 invoices each for every rule, with no differences. Tested in Chromium through scripted screens. It was not tested in Safari, Firefox or Edge.

What it is NOT It reads the text you give it. It does not read PDFs or images, does not look a TRN up, does not validate the TRN check digit, and does not decide whether a supply is taxable. It is not an FTA-approved system, files nothing with the FTA, and does not cover e-invoicing. It is not tax or legal advice.

How it differs from neighbours The UAE Tax Invoice Pack gives you invoice templates to issue. The VAT 201 Workings Workbook sorts your invoices into return boxes. This app does a different job: it checks whether an invoice is complete, one at a time or in bulk.

Requirements: a current browser on a computer or phone. No internet and no installation needed.