What changes on August 3, 2026?
From August 3, 2026, companies under Brazil's regular tax regime can no longer issue an electronic invoice without filling in the new IBS and CBS fields — an incomplete document is automatically rejected. The warning comes from the IBS Steering Committee (CGIBS), in a notice published on June 15, 2026: from that date, "the issuance of electronic tax documents without the fields relating to IBS and CBS will not be permitted for companies under the regular regime", because "the system will automatically reject incomplete documents".
Until August 2, the leeway granted by Joint Act RFB/CGIBS No. 1/2025 still applies — it allowed those fields to be left blank with no fine and no rejection. After that, the problem is operational before it is fiscal: with no authorized invoice, there is no revenue. According to the specialized outlet Contábeis (July 8, 2026), state tax authorities will start rejecting NF-e and NFC-e invoices missing those fields, and the requirement reaches companies under the regular regime — that is, actual-profit and presumed-profit taxpayers.
Will your company pay more tax in 2026?
No. 2026 is the tax reform's test year. The rates are symbolic — 1% in total, being 0.1% of IBS and 0.9% of CBS, according to CGIBS — and Receita Federal, Brazil's federal tax authority, states in its 2026 guidance that "taxpayers who issue tax documents [...] are exempt from paying IBS and CBS". What is at stake in August is not cash: it is systems, master data and documentation. Whoever reaches 2027 with a tidy ERP gets through; whoever improvises finds out when an invoice gets blocked.
The same guidance records that, since January 1, 2026, electronic tax documents must show "CBS and IBS highlighted individually per transaction" — covering NF-e, NFC-e, NFS-e, CT-e, NF3e, BP-e and NFCom.
Why has a system field become a boardroom matter?
Because the invoice is no longer a secondary obligation — it is now the key to the payment itself. Article 31 of Complementary Law 214/2025 creates split payment: electronic payment service providers "shall segregate and remit to the IBS Steering Committee and to Receita Federal, at the moment of financial settlement of the transaction", the IBS and CBS amounts — and the mechanism works through the "linkage between the electronic tax documents [...] and the payment transaction of the respective operations".
In practice: tax assessment moves out of next month's accounting close and into the cash flow itself. A wrong tax document stops being a month-end problem and becomes a cash-in problem.
What must a developer have on file by December 31, 2026?
The acquisition value of every property in inventory, the paid ITBI (property transfer tax) and leasehold fee receipts, construction costs backed by valid invoices, and the urban planning contributions registered with the land registry. The reason: December 31, 2026 is the date on which the law takes a snapshot of your assets.
Article 257 of LC 214/2025 provides that, from January 1, 2027, "an amount corresponding to the respective adjustment reducer shall be linked to each property owned by a taxpayer under the regular IBS and CBS regime" — an amount that follows the property, is adjusted by inflation (IPCA) and exists exclusively to reduce the IBS and CBS calculation base when that property is sold. The larger the reducer, the smaller the tax on the sale.
Article 258 then defines how that amount is formed. For properties already owned on December 31, 2026, the initial value is the inflation-adjusted acquisition value — or, at the taxpayer's option, the reference value assessed by the tax authorities. For properties under construction on that date, it is the sum of the land value plus the goods and services booked as cost, acquired before January 1, 2027 and — the wording is the law's own — "evidenced on the basis of valid tax documents". Added to that, on the date of actual payment, are "the amount of the Property Transfer Tax (ITBI) and of the leasehold fee levied on the acquisition" and the urban planning and environmental contributions, including those "registered with the real estate registry office".
In other words: the ITBI receipt, the property record and the cost invoice have become tax documents. Whatever is not evidenced does not enter the reducer — and whatever stays out of the reducer becomes taxable base.
The calendar that matters
| Date | What happens | Source |
|---|---|---|
| August 2, 2026 | Last day of the grace period for leaving IBS/CBS fields blank | Joint Act RFB/CGIBS No. 1/2025 |
| August 3, 2026 | NF-e and NFC-e without IBS and CBS fields start being rejected (regular regime) | CGIBS, 06/15/2026 |
| December 31, 2026 | Constitution date of the adjustment reducer — the inventory "snapshot" | LC 214/2025, art. 258, § 1, I |
| January 1, 2027 | Each property starts carrying its own adjustment reducer | LC 214/2025, art. 257 |
What happens if the paperwork does not add up?
The law anticipated three uncomfortable scenarios, and all of them cost money. First: if the acquisition value is based on "statements or documents that are inconsistent with market value or that are not trustworthy", the tax authority may open an administrative proceeding to determine the actual value (art. 258, § 3). Second: in a resale within three years, of a property acquired from a taxpayer under the regular regime, the reducer is capped at the acquisition value if the seller cannot evidence payment of the ITBI and of the capital gains income tax (art. 258, § 5). Third: when the property is sold to someone outside the regular regime, the reducer is simply extinguished (art. 257, § 4, II).
It is worth noting where the tax authority gets its yardstick: under article 256, the reference value of a property is assessed considering, among other elements, "information provided by registry and notary services". The property record is a source of evidence for both sides.
How much does the rate drop for real estate?
By half. Article 261 of LC 214/2025 reduces IBS and CBS rates by 50% on transactions involving real estate, and by 70% on leases, onerous assignments and rentals. There is also a social reducer: BRL 100,000 per new residential property and BRL 30,000 per residential lot, deducted from the calculation base once per property (art. 259), plus BRL 600 per month, per property, on residential leases (art. 260, as amended by LC 227/2026 — the same complementary law that reshaped Brazil's inheritance and gift tax and triggered this year's rush of donations).
These reducers are generous. They just happen to apply to a calculation base you can only shrink with paperwork you kept.
Frequently asked questions
What changes for invoices on August 3, 2026?
Companies under the regular regime start having NF-e and NFC-e invoices rejected if they do not fill in the IBS and CBS fields. Until August 2, missing fields were tolerated under Joint Act RFB/CGIBS No. 1/2025.
Will I pay IBS and CBS in 2026?
No. 2026 is a test year, with a symbolic rate of 1% (0.1% IBS and 0.9% CBS), and Receita Federal exempts from payment those who comply with the period's obligations.
What is the adjustment reducer?
It is an amount linked to each property, adjusted by the IPCA inflation index, that lowers the IBS and CBS calculation base when that property is sold (art. 257 of LC 214/2025). It takes effect on January 1, 2027 and is formed, among other items, by the acquisition value, the ITBI, the leasehold fee and urban planning contributions.
Why is December 31, 2026 an important date for developers?
Because it is the constitution date of the adjustment reducer for properties already owned or under construction (art. 258, § 1, I). Whatever is not evidenced with a valid document by then does not compose the reducer — and without the reducer, the tax on the sale is higher.
Does the ITBI I pay today count for anything in 2027?
Yes. Article 258, § 6, I of LC 214/2025 provides that the ITBI and the leasehold fee paid on acquisition are part of the property's adjustment reducer. In practice, the filed ITBI receipt becomes a tax discount on the future sale.