Free Tax Tools
Free online tools for Mexican fiscal compliance — no account required.
SAT Code Lookup
Search 52,000+ SAT product and service codes
Tax Calculator
Calculate IVA, ISR withholding, and invoice totals
CFDI Validator
Verify CFDI authenticity against SAT records
Postal Code Lookup
Validate postal codes for CFDI and check border zone rates
Mexican Fiscal Compliance Tools
Greenstamp provides free online tools for Mexican tax compliance and CFDI invoicing. Search SAT product codes, calculate IVA and ISR, verify CFDI invoices against SAT records, and validate postal codes for border zone detection. All tools are free to use and require no account.
Need full invoicing capabilities?
Create, file, and manage CFDI invoices with Greenstamp — built for accounting firms.