Top 10 FBR E-Invoicing Errors and How to Fix Them

Common FBR E-Invoicing Errors

When integrating with the FBR e-invoicing system, businesses often encounter validation errors. Here's how to resolve the most common ones:

1. Invalid NTN/CNIC Format

Error: "Buyer NTN/CNIC is invalid"

Solution: Ensure NTN is 7 digits and CNIC is 13 digits without dashes. Remove any special characters.

2. HS Code Not Found

Error: "HS Code does not exist in FBR database"

Solution: Verify the HS code using FBR's official lookup. Format should be XXXX.XXXX

3. Tax Calculation Mismatch

Error: "Calculated tax does not match provided value"

Solution: Ensure sales tax is exactly 18% of value (or applicable rate). Round to 2 decimal places.

4. Duplicate Invoice Reference

Error: "Invoice reference already exists"

Solution: Each invoice must have a unique reference number. Check your numbering sequence.

5. Invalid Date Format

Error: "Invoice date format is invalid"

Solution: Use YYYY-MM-DD format (e.g., 2026-03-12)

6. Missing Required Fields

Error: "Required field X is missing"

Solution: Ensure all mandatory fields are filled: buyer info, item details, tax amounts.

7. API Token Expired

Error: "Authentication failed"

Solution: Generate a new API token from FBR IRIS portal and update in your system.

8. Province Mismatch

Error: "Invalid province code"

Solution: Use exact province names: Punjab, Sindh, KPK, Balochistan, Islamabad

9. UOM Not Recognized

Error: "Unit of Measure not valid"

Solution: Use FBR-approved UOM codes: PCS, KG, MTR, LTR, etc.

10. Server Timeout

Error: "Request timeout"

Solution: Retry after a few minutes. FBR servers may be under heavy load during peak hours.

Need Help?

Contact FBR helpline at 051-111-772-772 or email helpdesk@fbr.gov.pk for technical support.