IBS and CBS on the Service Invoice: How to Calculate Step by Step
Learn how to calculate IBS and CBS on service invoices with a complete numeric example on R$ 10,000 in services. A step-by-step guide for accountants.
Executive Summary
From 2026 onward, every service provided in Brazil will be subject to CBS and IBS, replacing ISS, ICMS-ST, PIS and COFINS. For the accountant, the challenge is twofold: understanding the calculation mechanics and knowing where each tax sits on the electronic service invoice (NFS-e). In this guide, Vivian Sampaio walks you through it step by step with a real example of R$ 10,000 in services.
What Are CBS and IBS in Service Operations?
Before calculating, it is worth recalling:
- CBS (Contribution on Goods and Services): A non-cumulative federal tax that replaces PIS and COFINS. It applies to the service value plus the goods consumed in providing it.
- IBS (Tax on Goods and Services): A non-cumulative federal and state tax that replaces ICMS and ISS. It applies to the total service value.
Both are non-cumulative: at each operation, the provider can credit the CBS/IBS paid on inputs (supplies, goods, outsourced services) and debit the CBS/IBS charged on outputs. The result is the net amount payable or receivable.
Step 1: Identify the Effective Rate
The nominal CBS and IBS rates are, respectively, 0.1% in 2026, rising progressively up to the estimated equilibrium rates of:
But take note: The effective rate varies by sector and may be higher or lower depending on the credits available. Services with a high labor component tend to have fewer credits.
For our example, we will use the transition rates (0.1% each) to demonstrate the mechanism, and then show the calculation with full rates.
Step 2: Structure of the Service Invoice
A typical NFS-e will contain new fields to accommodate CBS and IBS:
Step 3: How to Calculate CBS and IBS — R$ 10,000 Example
Scenario: A consulting service provided for R$ 10,000.00.
Calculation with transition rates (2026):
Calculation with full rates (2027+):
Note: The total NFS-e amount increases because CBS + IBS replace not only ISS but also PIS and COFINS (previously paid by the provider) — in other words, the total cost of the service goes up.
Step 4: How Credits Work
The major advantage of CBS/IBS over the old taxes is broad crediting.
Complete example with credits:
Company XPTO, a consultancy, incurred the following expenses while providing the service (which already include CBS/IBS):
- Office rent: R$ 3,000
- Software hosting: R$ 500
- Accounting services: R$ 800
How the credits work:
The CBS/IBS paid on expenses (inputs) can be credited against the CBS/IBS charged on revenue (outputs).
Result: Instead of paying R$ 20 in CBS+IBS, the company pays only R$ 14 — the remaining R$ 6 are credits to be used in future operations.
Step 5: Where to Place CBS and IBS on the NFS-e
The NFS-e will be redesigned to accommodate the new taxes. Structurally, each tax will have its own field:
Important: The “ISS” field disappears. If there is tax substitution (ST), the disclosure mechanism will be different — still under regulation.
Step 6: Split Payment Regime — When the Buyer Collects the Tax
In certain B2B operation patterns, the service buyer is responsible for collecting the tax — the so-called Split Payment.
Example: Company ABC (buyer) hires consulting from XPTO.
- XPTO issues an NFS-e for R$ 10,000 + CBS + IBS
- Upon receiving the NFS-e, ABC withholds the CBS and IBS and remits them directly to the tax authority
- XPTO receives only the service value (R$ 10,000) — without CBS/IBS
Why does this exist? To prevent evasion — the buyer, usually a larger company, has greater financial capacity and compliance than the provider.
How it plays out in practice:
Practical Checklist for the Accountant
- Identify the effective CBS/IBS rates applicable to the sector
- Map the credits available on inputs (goods, services, operating costs)
- Configure the ERP/NFe system to issue NFS-e with the new CBS and IBS fields
- Review contracts with clients and suppliers for a Split Payment clause
- Train the team to segregate amounts and not mix CBS/IBS with other taxes
Want to understand how the tax reform affects your sector? On /napratica, VMAHUB publishes practical guides for businesses. For a personalized analysis of your case, talk to our team: [email protected]
Read also:
- The Invoice Under the Tax Reform
- The NBS Table: How to Find the Right Code
- Split Payment: What It Is and How It Works
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