CoreTax Guide

How to automatically batch-download CoreTax documents (save 2–3 hours)

December 27, 2025 · Updated 2026 · 6 Min Read

⏸️ Extension Currently Being Rebuilt

ZHX Coretax Downloader is not accepting new purchases while it's being rebuilt. This tutorial remains relevant for existing license holders.

The manual download problem on the CoreTax portal

On Indonesia's CoreTax system, downloading withholding slips or invoice documents in bulk means clicking through page after page and downloading one at a time. For a tax consulting firm with hundreds of clients, this eats up 2 to 3 hours every tax period.

Manual, one click at a time2–3 hours · high error risk
ZHX Coretax Downloader5–10 minutes · clean auto-rename

How to use the extension

  1. Open Google Chrome and make sure the ZHX Coretax Downloader extension is active.
  2. Log in to the official CoreTax portal as usual.
  3. Open the list of documents you want to download.
  4. Click the ZHX Labs icon in the top-right browser toolbar.
  5. Optionally select a tax-period filter, then click the Start Download button.
  6. The extension automatically runs through every page and saves the PDFs with clean filenames in your Downloads folder.

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