Categoria A vs. Categoria B: Employee vs. Self-Employed Tax in Portugal

• Categoria A (employee income) is taxed via automatic monthly withholding run by your employer, who also pays a Social Security employer share on top of your salary.
• Categoria B has different withholding rules, and the worker is responsible for the applicable tax and quarterly Social Security obligations.
• Both categories are added together (englobamento) under the same progressive IRS brackets, but each has its own deduction rules and reporting form.
• Plenty of people have both in the same tax year — a part-time job plus freelance work — and must declare both on the same Modelo 3 return.

Categoria A and Categoria B are the two IRS income categories most working residents deal with. Categoria A covers income from dependent work — a job with an employer, a public-sector role, or a directorship under someone else's authority (art. 2.º CIRS). Categoria B covers business and professional income — freelancing, sole-trader activity, recibos verdes, anything where you're working for yourself (art. 3.º CIRS). The label determines who does the paperwork and who fronts the money to the state before you ever see your IRS bill.

How Categoria A is taxed and reported

Employee income is combined into total taxable income (art. 22.º CIRS) and taxed under the 2026 progressive brackets in article 68.º, from 12.5% to 48%, with a solidarity surcharge above €80,000. Your employer withholds IRS from each payment and reports it to the Autoridade Tributária, so the annual return reconciles the final liability against the amount already withheld.

A specific deduction applies automatically: the higher of €4,587.09 in 2026 (8.54× IAS) or your obligatory Social Security contributions for the year (art. 25.º CIRS). Your employer reports through the monthly Declaração Mensal de Remunerações, which pre-fills Anexo A of your Modelo 3.

How Categoria B is taxed and reported

Self-employed and business income normally starts under Regime Simplificado when annual Category B income is no more than €200,000: a statutory coefficient applies instead of taxing documented profit. Contabilidade Organizada becomes mandatory in the following year after income exceeds €200,000 in two consecutive years or exceeds €250,000 once (art. 28.º CIRS). How the regime works, including the 15% expense test, is in thesimplified regime guide.

There's no equivalent to Categoria A's clean employer-run withholding. Clients only withhold IRS on your invoices when the law requires it (23% for the professions listed in the art. 151.º table, 11.5% for other services, 16.5% for IP — art. 101.º n.º 1 CIRS). Under art. 101.º-B n.º 1 a) you can opt out of withholding when you expect less than €15,000 of Categoria B income in the year: the option is not available if last year's income reached that limit, you must write «Sem retenção, nos termos do n.º 1 do artigo 101.º-B do Código do IRS» on each receipt, and it stops the month after you reach the limit (n.os 2 and 3). In practice, a large share of freelance income arrives gross. To compensate, you're on the hook for pagamentos por conta — three advance instalments due in July, September, and December (art. 102.º CIRS) — and the reporting itself splits across Anexo B (Regime Simplificado) or Anexo C (Contabilidade Organizada) rather than the pre-filled Anexo A employees get.

Social Security: two separate systems, two separate calendars

Social Security treatment is where the two categories diverge most in practice, because IRS and Segurança Social are entirely separate systems running on entirely separate schedules.

Concretely: as an employee, Social Security is already handled through payroll. As a self-employed worker, declaring and paying lands on you. When there is no relevant income, or the calculated monthly amount is lower, the minimum contribution is €20; the monthly base ceiling is 12× IAS (€6,445.56 in 2026).

When you have both in the same tax year

It's common to have a job (Categoria A) and freelance work (Categoria B). Both go on the same Modelo 3: Categoria A on Anexo A and Categoria B on Anexo B or C. They are combined for the progressive brackets, but the €4,587.09-or-higher-compulsory-contributions specific deduction under article 25.º only reduces Categoria A income. Categoria B has its own coefficient and expense rules.

The practical paperwork burden roughly doubles rather than averaging out: you still get the automatic monthly withholding and DMR reporting on the employee side, but you also take on the freelancer side's obligations in full — opening atividade, tracking invoices, filing Anexo B or C, making your own pagamentos por conta if they apply, and dealing with Social Security for the Categoria B income specifically. The job does not exempt the freelance income automatically: under art. 157.º n.º 1 a) of the Código dos Regimes Contributivos, you are exempt only on average monthly relevant income below 4× IAS (€2,148.52 in 2026), and only if the job is with a separate, unrelated entity, gives full social-protection coverage and pays at least 1× IAS (€537.13 in 2026) on average.