# VAT, reverse charge, and tax category problems

Each taxable amount needs the correct VAT category, and reverse charge invoices need extra VAT ID and exemption details.

## What you may see

- VAT category is required
- Tax category ID is missing
- Seller VAT ID is required
- Buyer VAT ID is required for reverse charge
- Reverse charge exemption reason is required
- Reverse charge tax rate must be zero
- Tax exemption reason is recommended
- VAT rate looks unusual

## What this means

E-invoices need every taxable amount to be assigned to a VAT category. Reverse charge invoices need extra care because the VAT responsibility moves to the buyer.

## What to check

- VAT rate on every line
- VAT category or exemption reason
- Seller VAT ID
- Buyer VAT ID, especially for reverse charge
- Whether the invoice says reverse charge, tax exempt, intra-community supply, or similar