TF Fiscal API
Knowledge base
Business and tax knowledge for Brazilian e-invoicing: which code fits which scenario, where parameters come from, how to troubleshoot
The API reference describes how each field is sent; the knowledge base describes what to send. Every topic is organised by business scenario and states how the platform actually behaves.
Taxes in depth
Which taxes appear on electronic invoices, who levies and who pays, which document carries them, which platform field maps to each — and how the reform starting in 2026 changes them
ICMS in DepthThe state tax on circulation: how it is computed, the rate system, tax substitution and the interstate differential, plus the CSOSN / CST tables split by regime
IPI in DepthThe federal tax on industrialised products: who the taxpayers are, where the rates come from, how the tax-exclusive computation affects the invoice total, plus CST and legal framing codes
PIS / COFINS in DepthTwo federal social contributions: cumulative vs. non-cumulative regimes, single-phase taxation, zero rate and export non-incidence, plus the CST table and the platform's computation rules
ISS in DepthThe municipal service tax: the service list, rate band, place of taxation and withholding, plus the company and invoice fields for service invoices (NFS-e) on the platform
IBS / CBS in DepthThe reform's dual VAT: what it replaces, how it is computed, the transition rates, and the ibs_cbs configuration and supported CSTs in the platform's tax categories
IS (Selective Tax) in DepthThe reform’s new selective excise on goods harmful to health or the environment: what it targets, when it starts, how it is computed, and the is configuration in the platform’s tax categories