IT Strategy

Brazil's tax reform invoice changes: what small businesses must do now

Since August 3, Brazilian electronic invoices missing the new IBS and CBS fields can be automatically rejected. Simplified-regime businesses are exempt until 2027 — everyone else needs to act.

August 14, 2026|5 min read

What changed earlier this month

Since August 3, 2026, Brazilian electronic invoices (NF-e and NFC-e) issued by companies under the standard tax regime (actual or presumed profit) must correctly fill in the IBS and CBS fields — the two new consumption taxes created by Brazil's tax reform. The Federal Revenue and state tax authorities' systems now automatically reject any document that doesn't meet this requirement.

Actual collection of these taxes hasn't started yet — 2026 is a test year, with informative reporting and no charge as long as the accessory obligation is met. But invoice rejection is already happening.

Why this can stop operations, not just annoy finance

For a small business selling into or operating in Brazil, a rejected invoice isn't just a system error to fix later. In practice, it can simultaneously block invoicing, shipment, payment collection, and accounting close-out — because the invoice is the document that authorizes the whole chain to move forward. A business that hasn't updated its ERP or invoicing system for these rules risks losing the ability to sell overnight, with no warning beyond the rejection error itself.

Who needs to act now, and who has more time

Businesses under Brazil's simplified tax regime (Simples Nacional) are exempt from these requirements until January 1, 2027 — no urgent action needed yet, but the deadline is worth tracking. Businesses under the standard regime need to confirm, this week, whether their invoicing system is already updated for the new fields. The right question for your accountant or ERP provider is direct: "are our invoices going through without rejection since the 3rd?" — not "are we aware of the reform."

What to check with whoever manages your tax system

Three checks cover most of the risk: confirm the ERP or invoicing system is on the updated version supporting the IBS/CBS fields, issue a test invoice and check it clears without error, and ask your accountant whether any invoice issued in early August, before the update, needs correcting.

Where Diglion comes in

Diglion helps small and mid-sized businesses confirm their billing systems and ERPs are ready for Brazil's new tax requirements, so a rejected invoice doesn't stop operations.