Guide on transitioning VAT declaration periods from monthly to quarterly and vice versa using HTKK

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Ngày cập nhật gần nhất: 15/4/2026

The shift in declaration periods from monthly to quarterly and vice versa on HTKK has been in practice since the Q4/2014 declaration period. In this Mytour article, we provide a comprehensive guide on executing this transition. Explore the details with us.

* Access tax declaration support software: Download HTKK
* Get iTax Viewer software: Download iTax Viewer

1) Re-register the declaration period on the iHTKK system:

2) Data Migration from Monthly to Quarterly Declaration on HTKK Software:

Step 1: Open the monthly declaration, choose to export to an Excel file, and save it on your computer.

Step 2: After saving the monthly declaration, proceed to delete the declaration and its appendices for that month. Failure to delete them will result in the system error message, 'Monthly declaration already exists in this quarter; you must choose the monthly declaration type.'

Step 3: Once deleted, copy the data from the Excel file (exported in Step 1) to the corresponding appendix table, then upload the table to the HTKK software.

With this article, we have guided you on how to switch VAT declaration periods from monthly to quarterly and vice versa on HTKK. Additionally, you can explore solutions for fixing the issue of being unable to print XML-format tax declaration on iTax Viewer

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