Accountant for service companies: what changed in 2026

Service companies have accounting particularities that many accountants don’t master — and 2026 marks the start of significant changes to Brazil’s tax framework. If your company provides services, the right accountant needs to understand ISS, NFS-e, withholdings, accrual accounting, and the initial impact of the Tax Reform.

Vivian Sampaio, founding partner of VMAHUB and a reference in tax consulting for service providers, explains what is changing and what that demands from your accountant.

Why service companies require special attention from the accountant

In accounting terms, a service company differs from retail and industry for one central reason: the main tax on revenue is municipal (ISS), with rules that vary from city hall to city hall. Add to that source withholdings by corporate (PJ) clients, NFS-e rules specific to each municipality, and the coexistence of ISS with PIS/COFINS/IRPJ/CSLL, and the tax picture becomes complex.

An accountant who mainly serves retail is rarely sharp on this menu. For service companies, specialized expertise becomes the decisive factor.

Regulatory changes affecting service providers in 2026

Updates to Simples Nacional (simplified tax regime) for services

The gross-revenue brackets and the rates of Annexes III, IV, and V of Simples remain in force, but the tax authority updated its interpretation of the “fator R” (the ratio between payroll and revenue) — service companies that move between annexes due to payroll variations need to recalculate quarter by quarter. Those who leave this review until year-end pay more tax.

New NFS-e rules by municipality

The move toward unifying the national NFS-e advanced in 2025 and 2026 — several municipalities have already adopted the national standard, with XML format and API-based generation. An accountant who still issues NFS-e manually on the municipal portal, without integration, is behind. Ask your accountant whether the integration with the municipal API is already running.

How ISS withholding affects your company

When one legal entity hires services from another PJ, the client is often required to withhold ISS at source and remit it directly to the municipality. For the provider, this means an invoice issued for the gross amount, net receipt, and a credit for the withheld ISS to offset in the monthly assessment.

The problem arises when the accountant doesn’t track this credit: the company pays ISS twice (once on withholding, once on the monthly slip). The accountant needs to map all withholdings month by month, check the clients’ payment slips, and offset them against the municipal debit account.

Challenges of ISS calculated at source

Some specific activities (engineering, civil construction, intermediation) have more complex source-ISS rules, with their own rates per municipality and rules for excluding items from the calculation base (materials, subcontracting). An accountant who doesn’t know these particularities ends up paying ISS on an inflated base — a direct loss to the company’s cash.

The accountant’s role in managing outsourced providers

Service companies frequently subcontract part of the scope. The relationship with the subcontractor has tax implications that many forget:

• INSS withholding on the supply of labor (11% via the GPS slip)
• IR (income tax) withholding at source on PJ payments
• Risk of an employment bond if the outsourcing is poorly structured “pejotização” (disguised employment via a company)

An aligned accountant reviews subcontracting agreements, validates the subcontractors’ tax regime, and advises on labor compliance — before it becomes a liability.

Tax planning for service companies

The difference in tax burden between Simples (Annex III or V), Lucro Presumido (presumed-profit regime), and Lucro Real (actual-profit regime) can reach 10 percentage points of revenue for the same company. For services with high payroll, Lucro Presumido is often more advantageous than Simples Annex V; for services with low payroll and high margin, Simples Annex III may be better.

The regime review must happen annually, based on projected revenue and payroll for the following year. An accountant who doesn’t run this review proactively is delivering service below the minimum acceptable for a service company.

What the Tax Reform changes for services from 2026 onward

Brazil’s Tax Reform (LC 214/2025) starts taking effect in 2026 with pilot CBS and IBS rates. For services, the initial impact includes:

• The start of split payment testing (automated withholding at source)
• Generation of IBS/CBS credit on inputs
• Progressive changes to ancillary obligations through 2033

An up-to-date accountant is already advising clients on how to capture IBS/CBS credit from 2026 — without it, your company pays tax it could have offset. Ask your accountant how they are preparing for this.

How to know whether your accountant is right for services

Ask three test questions:

1. “How did you assess ISS last month? Can you walk me through it?” — if the answer is vague, it signals a manual or poorly outsourced process.
2. “What was the last tax-regime review you suggested for my company?” — if there has never been one, it signals reactive management.
3. “What changes for my company under the Tax Reform from 2026?” — if the answer is “let’s see next year,” the accountant is behind.

If the answers don’t satisfy you, it’s worth considering a switch. VMAHUB serves service providers across many verticals — IT, consulting, healthcare, engineering, marketing — and runs proactive tax review by contract. Learn more at /trocar-contador or talk to us on WhatsApp at +55 11 91568-5570.

What to watch for in the first meeting with a service accountant

Whether in person or online, the first conversation with a potential accountant for a service company should reveal whether they master the segment’s particularities. Watch for:

• Did they ask about your service clients? Source-withheld ISS varies by client and municipality — an accountant who doesn’t ask about this is probably assessing ISS without considering the credit.
• Did they mention the Simples “fator R”? For services under Simples Nacional, the fator R defines which annex (III or V) applies. If they didn’t mention it, they aren’t actively reviewing.
• Do they know your municipality’s NFS-e? Each city has its own system. An accountant who issues NFS-e manually on an outdated portal will probably generate inconsistencies.

If the first conversation is about red tape and deadlines, without mentioning planning or regime, you have an executor accountant — not an advisor.

Going deeper

Explore the content hub on accounting and management at /naprática.

Also read: What to ask before hiring a new accountant, Mistakes when choosing a new accountant for your company, and Signs that you need to switch accountants.

Vivian Sampaio is an Accountant, Lawyer, and founder of VMAHUB, with more than 26 years of experience in accounting and tax law.