Service invoices at an HOF clinic: what to issue

Almost every orofacial harmonization (HOF) professional learns to see patients, to inject and to talk with the patient, and almost none learns to issue an invoice. Still, the service invoice is the bridge between the appointment and the tax, and a badly issued one leads to fines, rework and, sometimes, unnecessary exposure of patient data.

This guide explains the basics in Brazil: who issues, when, what goes in the description and in the service code, how the national standard and the tax reform (IBS and CBS) fit in and what to watch for under the LGPD (Brazil's data protection law). It is not tax advice. Invoice rules vary by municipality and by regime, and they change. Your accountant is the one who defines the setup for your company.

Who issues an invoice and who issues a receipt?

To understand the difference between working as an individual or with a CNPJ (Brazil's company registry number) and what it changes in taxation, see the Simples Nacional vs. individual simulator. If the clinic is being opened now, the guide on CNAE and the one on opening the clinic show how the tax classification relates to the invoice.

What is the national NFS-e?

The national NFS-e is a single standard for electronic service invoices, with a federal public issuer and the option of integration through software. The idea is that the invoice carries the same information across the country, instead of each municipality having its own model.

Two cautions about dates and scope:

• Municipal adoption and the mandatory requirement for each group of taxpayers have been rolled out in stages. For Simples Nacional companies, resolutions of the Simples Nacional Steering Committee set deadlines that were changed throughout 2026, and the most recent date announced points to November 1, 2026. Because those dates have changed, confirm with your accountant and on the official NFS-e portal (gov.br/nfse) what applies to you.
• Each municipality's own rule still exists. Some city halls already require the national standard, others still use their own system.

In practice, ask your accountant three things: which system should I issue in, from when, and what do I need to register (digital certificate, municipal registration, service codes, tax rate).

Which service code should I use?

The service invoice uses a code from the service list in Complementary Law 116/2003, which also defines which item the activity falls under for ISS purposes. Health services fall under item 4 of the list, with different sub-items depending on the nature of the service. As an example of how it is organized, there are sub-items such as medicine and biomedicine, and dentistry. Nonclinical aesthetic care procedures may fall under another item.

The key point: the code is not a marketing choice. It must match the activity actually performed, the profession of whoever performs it and what appears in the company's registration. The wrong choice can lead to an inadequate tax rate, a disallowance during an audit and classification problems. Ask your accountant for the code and the standard description, and check the current list in an official source, because the law has been amended over the years. The text is available at Planalto.

What should the service description say?

The invoice must describe the service, but that does not authorize exposing the patient's health data. The data sent to the city hall's system and to the customer is tax data, and the description must respect the minimum necessary principle of the LGPD.

Hypothetical example of a standardized description (to be validated with your accountant and the municipality's requirements): "Health care services provided at the office, per appointment no. ____." The text does not reveal the procedure, product or diagnosis, but it identifies the appointment for internal control.

When should the invoice be issued?

The right moment varies, and it is the kind of question your accountant answers. Some common scenarios, with no single rule:

Define the rule, write it down as a procedure and apply the same one to every patient. The installment and fee calculator helps you see how much is left after the card terminal fee, but the timing of the invoice is a tax decision, not a financial one.

And the patient? What must the invoice include?

In general, the invoice identifies the provider (legal name, CNPJ, municipal registration), the customer (name and CPF, Brazil's individual taxpayer ID, when requested or required), the date, the amount, the service code and the description. About the customer:

• Ask only for the data you need. Full name and CPF are usually enough. Avoid asking for more information than the invoice requires.
• Confirm with the patient how the name should appear, to avoid cancelling and reissuing.
• Store invoices securely, together with the clinic's financial records and separate from the clinical record.
• Do not send the invoice through an insecure channel with extra treatment information.

The clinic must also keep the clinical documentation in line with the professional council's rules, which is a record separate from the invoice.

How do IBS and CBS fit into the invoice in 2026?

The consumption tax reform created the IBS and the CBS, which will gradually replace the ISS, the ICMS, the PIS and the Cofins. In 2026 there is an adaptation phase in which the display of these taxes on tax documents is informational and how you fill them in follows transition rules. The page on IBS and CBS at an HOF clinic summarizes the calendar and the questions for your accountant.

What this changes in the clinic's routine today:

1. Updated issuing system. Ask whether your issuer already has the new fields and when they must be filled in.
2. Correct service registration. How the service is classified on the invoice influences how the new taxes are read. Do not improvise.
3. Revenue organized by type of service, which helps the accountant simulate the tax burden and pricing.
4. Keeping up with the rules. They are still being regulated and may change. Confirm with your accountant before acting.

Common invoice mistakes at the clinic

• Issuing the invoice with a service code that does not match the activity.
• Putting the procedure, product or diagnosis in the description.
• Not issuing for payments made "in cash" or "by Pix".
• Issuing an invoice in the name of someone other than the real customer, without guidance.
• Forgetting to cancel or replace the invoice after a refund or an error.
• Not keeping invoices and receipts for the required period.
• Relying on a single person to issue, with no written procedure.

Invoice checklist

• Did my accountant tell me which system, from when and with which code to issue?
• Do I have a standardized description text, with no health data?
• Is the rule for when to issue (deposit, package, installment) written down?
• Do we ask only for the patient data we need?
• Is the issuer ready for the IBS and CBS fields by the deadline my accountant gave?
• Is there a procedure to cancel and replace an invoice?
• Are invoices and receipts stored securely?
• Do we never issue an invoice for a service different from the one provided?

A well-organized invoice process is part of the clinic's safety. It protects the company in an audit, protects the patient from unnecessary exposure and gives the accountant the data needed to calculate tax, pricing and margin with peace of mind.