The Coretax System, Indonesia’s new digital tax administration platform, has been facing several technical issues since its launch. Many taxpayers and businesses have reported login failures, authorization errors, and problems with tax invoice submissions. If you are experiencing difficulties, this guide provides practical Coretax system errors troubleshooting steps to resolve common Coretax errors efficiently.

1. Login Failures
Issue:
- Unable to log in to the Coretax system.
- Login page not loading or showing errors.
Solutions:
- Check Network Stability: Ensure you have a stable internet connection. If needed, switch to a different network or mobile data.
- Clear Browser Cache & Cookies:
- In Chrome: Press
Ctrl + Shift + Delete
→ Select “Cookies and Cached Images” → Click “Clear Data.”
- In Chrome: Press
- Use Incognito Mode: Open Coretax in an incognito/private window (
Ctrl + Shift + N
in Chrome). - Try a Different Browser: Preferably Google Chrome or Mozilla Firefox.
- Check Server Status: Visit the DJP’s official website or social media for system maintenance updates.
2. Authorization & Electronic Certificate Errors
Issue:
- Unable to access Coretax due to authorization failure.
- Electronic certificate not recognized.
Solutions:
- Verify Certificate Validity: Ensure your e-Certificate is valid and has not expired.
- Reinstall the Certificate: Download the latest e-Certificate from DJP Online and reinstall it.
- Use the Correct File Format: Ensure your certificate file is in
.p12
format and correctly imported into your browser. - Disable Browser Extensions: Some security extensions may block the certificate from loading. Disable them temporarily and try again.
3. OTP Not Received
Issue:
- OTP (One-Time Password) for login or transactions is not received.
Solutions:
- Check Spam/Junk Folder: Sometimes OTP emails may be filtered into spam.
- Try Resending OTP: Wait 5 minutes and request another OTP.
- Use an Alternative Contact Method: If using email, try switching to an SMS OTP (if available).
- Verify Phone Number & Email: Ensure your registered email/phone is correct in the Coretax system.
4. Issues with Taxpayer Profile Updates
Issue:
- Cannot update taxpayer details.
- Errors when editing address, contact details, or business status.
Solutions:
- Log Out & Log In Again: Profile data may need a session refresh.
- Try Updating Outside Peak Hours: Avoid system congestion by accessing Coretax early in the morning or late at night.
- Check Your Taxpayer Status: If your NPWP (Taxpayer Identification Number) has issues, contact DJP support.
5. Billing Code Errors
Issue:
- Cannot generate billing codes.
- Payment reference number is incorrect or rejected.
Solutions:
- Re-check Tax Code & Year: Ensure you have selected the correct tax type and year when generating the code.
- Wait for System Refresh: Sometimes, billing codes take time to sync. Wait 15-30 minutes and try again.
- Contact the Bank: If a payment error occurs, check with your bank to ensure there are no transaction issues.
6. Errors Uploading Tax Invoices (Faktur Pajak)
Issue:
- System does not accept uploaded invoices.
- Errors while submitting invoices.
Solutions:
- Use the Correct File Format: Ensure the invoice is in CSV, XML, or PDF as required.
- Reduce File Size: Large files may cause failures. Try compressing the file before uploading.
- Try a Different Browser: Switch to Google Chrome or Firefox for better compatibility.
7. NPWP (Tax ID) Registration Issues
Issue:
- Cannot register a new NPWP for foreign nationals.
- Errors when updating NPWP status.
Solutions:
- Check Required Documents: Ensure you have uploaded necessary identity documents (e.g., passport for foreign nationals).
- Try Again Outside Peak Hours: System congestion may cause failures during busy hours.
- Verify with Tax Office: If issues persist, contact the nearest tax office (KPP).
8. Coretax Website Downtime (404 Error)
Issue:
- Coretax website (
coretaxdjp.pajak.go.id
) shows a “404 Page Not Found” error. - Website is inaccessible due to downtime or incorrect URL.
Solutions:
- Check If the Website is Down: Visit the official DJP social media or website to check for downtime announcements.
- Verify the URL: Ensure you are using the correct link. Sometimes, official links may change.
- Try a Different Device or Network: Some connectivity issues may be specific to your ISP or device.
- Retry After Some Time: The site may be temporarily down due to maintenance.
9. General Troubleshooting Steps
- Try Accessing the System at Off-Peak Hours (e.g., early morning or late at night).
- Disable VPN or Proxy as it may cause login/authentication failures.
- Restart Your Browser or Device before trying again.
- Contact Coretax Customer Support via DJP Kring Pajak at
1500200
or their official social media.
Final Thoughts
If none of the above solutions resolve your issue, check DJP’s official announcements (DJP Twitter) or contact their support team. Coretax is a new system undergoing improvements, and the Directorate General of Taxes (DJP) is actively working on fixes to ensure smoother operations for taxpayers.
This Coretax system errors troubleshooting guide aims to help users efficiently resolve common issues and ensure seamless tax compliance.