Brazil's Simples Nacional and tax reform: what to decide by December 20 on IBS and CBS
A company that opted for the regular IBS and CBS regime in the window ending in October 2026 can still cancel, irrevocably, until December 20. The decision turns on the credit its B2B clients can use and the credit the company itself gives up on its purchases.
For a Latin American company with a subsidiary or clients in Brazil, the tax reform left a practical decision on a short clock: keep IBS and CBS inside the Simples Nacional DAS, or settle them under the regular regime from 2027. The option window closed on October 30, 2026, but cancellation, which is irrevocable, remains possible until December 20.
At Soulbit Academy we cover only that decision here, not the general framework. For what IBS and CBS are and the calendar through 2033, see IBS and CBS: what changes for companies. For the cash effect of collection at settlement, see the article on split payment. Data are current as of November 2026.
The Simples dilemma: credit for the client or a lighter burden
A Simples Nacional company chooses between two paths: stay with IBS and CBS collected inside the DAS, or settle them under the regular regime, with debits and credits like other companies, and pass full credit to its clients.
The first path is simple. The single Simples rate includes an IBS and CBS portion, the calculation follows revenue and the company manages no credits. The cost shows up at the client: a regular-regime buyer only uses credit limited to what the Simples supplier owes within the regime, not the full tax of an ordinary transaction.
The second path trades simplicity for credit. By settling IBS and CBS under the regular regime, the company shows the taxes on the invoice at the full rate and the B2B client credits that amount. In return, the company can deduct tax paid on its own purchases. The provision sits in article 41 of Complementary Law 214/2025, which lets a Simples taxpayer pay IBS and CBS outside the unified regime.
Why does this matter to a company that sells to other businesses?
Because a supplier that generates full credit costs less to a client that is also in the regular regime. If two suppliers charge the same price, the client prefers the one that returns more credit. A company that sells to final consumers gains nothing from client credit, because consumers cannot credit tax.
What the Receita Federal set: deadlines and effects
CGSN Resolution 194, published on September 28, 2026, amended Resolution 186. The regular IBS and CBS regime option ran from September 1 to October 30, 2026, for January to June 2027. Cancellation can be requested from November 3 to December 20, 2026.
The current deadlines appear in the official Brazilian Ministry of Finance notice, which summarizes CGSN Resolution 194:
- These are different procedures: opting into Simples Nacional for 2027 ran from September 1 to October 15, 2026, while the regular IBS and CBS regime option ran from September 1 to October 30.
- Effects start on January 1, 2027, and the regular-regime option applies exclusively from January to June 2027.
- The IBS and CBS portions stop being collected through the Simples Nacional, without the company being excluded from the regime.
- Either option can be cancelled from November 3 to December 20, 2026; once made, the cancellation cannot be reversed.
The 2026 choice applies only to the first half of 2027. Buyer credits and the option to settle IBS and CBS outside the DAS are governed by articles 47(9) and 41(3) of Complementary Law 214/2025.
What happens if I do not cancel by December 20?
A company that opted by October 30 and does not cancel keeps the regular regime for the first half of 2027. A company that did not opt stays with IBS and CBS inside the DAS.
Staying in the Simples: how IBS and CBS sit inside the DAS
A company that stays in the Simples pays IBS and CBS inside the DAS, settles no credits, and its regular-regime client can use credit limited to the amount the supplier owes in the Simples.
The mechanics are continuous: the DAS is still calculated on gross revenue and the company records no purchase credit.
Article 47(9) of LC 214/2025 bars the Simples supplier from crediting its own purchases and limits the regular-regime buyer’s credit to the tax due by that supplier under the Simples.
| Aspect | Stay in the Simples (IBS and CBS in the DAS) | Regular IBS and CBS regime |
|---|---|---|
| How IBS and CBS are paid | Inside the DAS, on gross revenue | Outside the DAS, with own debits and credits |
| Credit for the B2B client | Limited to the amount owed in the Simples | Follows the tax shown on the invoice |
| Credit on the company's purchases | Not available | Available on purchases carrying IBS and CBS |
| Operational complexity | Low, no credit bookkeeping | Higher: settlement, reconciliation and credit management |
| Profile that tends to gain | Sells to final consumers or buys little with credit | Sells to regular-regime B2B clients and buys heavily with credit |
| Effect on the Simples | None | Stays in the Simples, without paying IBS and CBS through the DAS |
Opting for the regular regime: full credit and more administration
A company that opts for the regular regime stays in the Simples but starts showing IBS and CBS on the invoice, crediting its purchases and handing its B2B client the credit for the tax shown.
There are three concrete effects. First, the DAS shrinks, because the IBS and CBS portions leave it, according to the Receita Federal. Second, the company must settle both taxes itself, which requires invoicing and accounting systems ready for the IBS and CBS fields. Third, cash risk: tax on sales may fall due before the credit on purchases, and the balance can turn negative in a month of heavy inventory buying.
Is the regular regime more expensive for a company that sells to final consumers?
Generally yes, or at least it brings no benefit. The final consumer cannot credit tax, so the supplier absorbs the full burden with no commercial offset. A company that sells mostly to individuals should compare its current DAS burden with the full IBS and CBS burden, and cancel by December 20 if the cost rises.
Who gains from each option and how to calculate it
The regular regime favors a company whose regular-regime B2B client base offsets the loss of the DAS, and the Simples favors one that sells to final consumers or has few purchases carrying credit.
To decide, the calculation has four steps. First, split revenue between regular-regime B2B clients, Simples clients and final consumers. Second, estimate the IBS and CBS currently inside the DAS. Third, estimate the creditable tax on your purchases. Fourth, estimate how much price you could win or lose through the client's credit.
The example below uses unsourced assumptions, which are not official rates or any Soulbit price. Suppose a company sells R$ 100,000 to regular-regime B2B clients, with purchases of R$ 40,000. Suppose the IBS and CBS portion inside the DAS is 4% of revenue and the full rate in the regular regime is 20%, on both sales and purchases.
| Item (hypothetical values) | Stay in the Simples | Regular regime |
|---|---|---|
| IBS and CBS paid by the company | R$ 4,000 (4% of R$ 100,000, inside the DAS) | R$ 20,000 debit minus R$ 8,000 purchase credit = R$ 12,000 |
| Credit used by the B2B client | R$ 4,000 | R$ 20,000 |
| Credit difference for the client | Baseline | R$ 16,000 more |
| Burden difference for the company | Baseline | R$ 8,000 more |
In the example, the regular regime costs the company R$ 8,000 more but gives the client R$ 16,000 more credit. The company gains if it can turn that advantage into price or volume worth more than R$ 8,000. If the client is not in the regular regime, the math reverses. The break-even therefore depends on the client mix, which is what the accountant should calculate with the company's real data.
What to do before December 20, 2026
By December 20, the company should check whether its option was accepted, model the effect by client mix and decide whether to keep or cancel, remembering that cancellation is irrevocable.
The recommended sequence has four tasks:
- Check the option status in the Simples Nacional portal and keep proof of any cancellation.
- List the ten largest clients and classify each as regular regime, Simples or final consumer.
- Estimate creditable tax on purchases using real 2026 data, not the hypothetical rate in this article.
- Confirm with the accountant that the ERP and invoicing tool are ready for the IBS and CBS fields, because the regular regime requires its own settlement.
Is it prudent to cancel the option?
Cancelling the regular-regime option may suit a company that sells mainly to consumers or other Simples businesses, depending on its purchase and customer mix. Cancellation reduces debit and credit management but can weaken its position with clients who value tax credits. Before making an irrevocable cancellation, review the figures with the Brazilian accountant.
The foreign exchange tax is separate and is covered in IOF on foreign exchange for companies in Brazil. The summary of last-quarter exchange changes is in changes to Brazil's international payments in October 2026. For the Brazil to United States route, see the Brazil-United States corridor.
What Soulbit's V1 does and does not do on this topic
Soulbit's V1 does not calculate, withhold or remit IBS or CBS, does not integrate Brazilian split payment and does not help choose between the Simples and the regular regime: Soulbit is not a bank or a tax advisory.
What the V1 offers is balances in stablecoins, USDC and USDT, and in fiat, dollar, euro and pound, after KYB verification. Custody is institutional. There are payment links, collection QR codes, recurring and batch payroll, and OTC conversion by quote on request. The local bank rail exists only in Colombia.
The V1's local disbursement is limited to Colombian pesos and dollars, and there is no disbursement in reais. Payments in reais inside Brazil keep running through the Brazilian financial system. For a company that collects from clients abroad or has a Brazilian subsidiary, the platform can be a treasury route, but it does not change the IBS and CBS burden.
The platform does not promise yield. The decision is an accounting matter and should be taken with the Brazilian accountant.
Frequently asked questions
What is the deadline to cancel the regular IBS and CBS regime option?
According to the Receita Federal, the option for the regular IBS and CBS regime ran from September 1 to October 30, 2026, and can be cancelled irrevocably until December 20, 2026. Effects cover January to June 2027. Check the status of your request in the Simples Nacional portal before that date.
Does opting for the regular regime take a company out of the Simples Nacional?
No. According to the Receita Federal, the IBS and CBS portions stop being collected through the Simples Nacional, but the company is not excluded from that regime. The other taxes in the DAS keep being paid as today. What changes is that IBS and CBS are settled outside the DAS, with their own debits and credits.
Does my B2B client get IBS and CBS credit if I buy from a Simples supplier?
Yes, but in a limited way. Article 47(9) of Complementary Law 214/2025 limits that credit to the IBS and CBS the supplier owes under the Simples. If the supplier opts for the regular regime, the credit follows the tax shown on the invoice. Validate this reading with your accountant.
Who tends to gain from the regular regime?
The company that sells mostly to regular-regime B2B clients and has many purchases carrying credit tends to gain, because the client takes full credit and the company recovers tax on its inputs. A company that sells to final consumers or buys little tends to lose, since the IBS and CBS burden rises with no credit in return.
Does Soulbit help decide or pay IBS and CBS?
No. Soulbit is not a bank or a tax advisory, and its V1 does not calculate, withhold or remit IBS or CBS. The platform offers USDC and USDT balances with institutional custody and local disbursement only in Colombian pesos and dollars, with no disbursement in reais. The tax decision belongs to the company and its accountant.
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