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How to Update Your Citizen ID to Tax Identification Number on eTax Mobile

Date: 2025.07.01

Starting from July 1, 2025, the personal identification number (12-digit Citizen ID or National ID code) will officially replace tax codes for individuals, households, and household businesses nationwide.

This aims to synchronize tax system data with the National Population Database, increase transparency, and reduce administrative procedures.

🛠 Step-by-Step Guide on eTax Mobile

Step 1: Log in to the eTax Mobile app → Select: Tax Registration → Update Information

Step 2: The interface will display your information:

– Name and Date of Birth are editable

– Old document numbers cannot be edited

– New document number: You are allowed to input your Citizen ID (CCCD)

– Enter the CCCD or National ID code and click Fetch Citizen Information to cross-check with the National Database

Step 3: The screen displays:

– If information is not found: The system will instruct you to contact the police to update your population records

– If the citizen information is found: It will display both the old and new tax registration info → Choose the tax authority based on your residence (permanent/temporary) and mark any changes if needed

Step 4: Select the fields you want to update such as ID card, phone number, email… and fill in the details (issue date, place of issue, phone number, email), then click Continue

Step 5: After clicking Complete Declaration, you will see Form 08‑MST

Step 6: You may share the PDF and attach related documents (photos, files) through the app.

Then click Complete, receive an OTP, and send the application.

Step 7: You can choose: Skip (not send) or Agree (send). After agreeing, the system will notify: “Your application has been successfully submitted” and you will need to wait for processing.

📌 Source: Thu vien phap luat (Legal Document Library)

✅ Important Notes

– Review all old and new information carefully before submitting.

– Once your information matches and is confirmed by the tax authority, your Citizen ID will officially replace your tax code and be used for all tax-related transactions.

– The transition does not affect previously issued tax documents – they will remain legally valid.

– If the information does not match, your tax code will be marked as “pending update” and you must complete the process to continue using it normally.