How to File Taxes in Portugal as a Freelancer

Three separate obligations. Two separate authorities. Three separate deadline calendars.

That's the part most guides about "paying taxes in Portugal" either skip or bury. When you register as a freelancer in Portugal, you don't file one return. You get three obligations that run in parallel, each with its own rhythm, two of them run by the tax authority and one by Social Security.

If you're arriving from a country where there's one tax authority and one annual return, this structure is genuinely confusing at first. This post is the map before you need it.

The three tax obligations

IRS (Imposto sobre o Rendimento das Pessoas Singulares) is income tax. It's the closest equivalent to personal income tax in the UK, US, Germany, or Sweden. Filed once a year, April 1 to June 30, for the prior year's income.

IVA (Imposto sobre o Valor Acrescentado) is VAT. Usually filed quarterly once you're in the normal VAT regime. Freelancers under the Art. 53 exemption don't charge it and file no VAT return for their own sales.

Segurança Social (Social Security) contributions are declared quarterly and paid monthly, to a different authority with its own portal.

AT (the tax authority) handles IRS and IVA. The Instituto da Segurança Social handles Social Security contributions. They are separate obligations, but not sealed off from each other: Social Security enrols you automatically when you open your activity with AT, and your IRS return includes a Social Security annex (Anexo SS).

IRS: income tax

IRS is what most people mean when they say "file taxes." For freelancers, it works like this:

Portugal uses what it calls the regime simplificado (simplified regime) for sole proprietors whose gross income in the previous year stayed under €200,000. Going over once doesn't end it: that takes two years in a row over the limit, or one year more than 25% over. Under this regime, AT applies a coefficient to your gross revenue to determine how much of it is taxable. The most common coefficients:

• 0.75 for professional services listed in the Art. 151 CIRS table (consultants, developers, lawyers, architects, accountants, and similar)
• 0.35 for other services not on that list
• 0.15 for goods sales and hospitality (hotels, restaurants and bars)

If you invoice €48,000 in consulting fees, AT treats €36,000 (75% of €48,000) as taxable income. The other €12,000 is assumed to be business costs, but not entirely without proof. For services, your documented expenses have to reach 15% of gross income, or the shortfall is added back to your taxable income. Your Social Security contributions (up to 10% of gross) or the specific deduction, whichever is larger, count toward that. Social Security above 10% of gross isn't lost: for services, that part is deducted from your taxable income after the coefficient. You can't swap the coefficient for your real expenses unless you move to organised accounting. The 15% expense rule page has the full mechanics.

That taxable amount then gets progressive IRS rates applied to it, just like an employee's salary does. Take off any deductions you're entitled to, and you arrive at the tax you owe.

When to file: The filing window opens April 1 and closes June 30. You file for the prior year's income: the 2027 window covers 2026 earnings. You use Modelo 3 with Anexo B (the category B income annex for freelancers on the simplified regime) and Anexo SS (Social Security, required from every self-employed filer). If you had foreign income, you also need Anexo J.

The withheld amount: A Portuguese client that has, or must have, organised accounting (every Portuguese company does) withholds IRS from what it pays you and sends it to AT. The rate is 23% for activities in the Art. 151 table and 11.5% for other services. That's not a final tax; it's a prepayment against your IRS liability, reconciled in the annual return. If you expect your income this year to stay under the Art. 53 threshold of €15,000, and you did not reach it last year, you can claim a dispensation on the receipt instead (it stops from the month after you reach the limit), and a withholding under €25 is not made at all. Foreign clients normally have no Portuguese organised-accounting obligation, so they don't withhold, and you budget for that tax yourself.

First-year reduction: For services, the coefficient is cut by 50% in the calendar year you start and by 25% in the next one. For a listed service that means 37.5% taxable in year one and 56.25% in year two. Goods sales get no reduction. It runs by calendar year, not 12 months from your start date, so starting in March gives you ten months at the year-one rate. You lose a year's reduction if you also have employment or pension income that year, and you get none if you closed an activity in the previous five years.

The full step-by-step for IRS filing is in How to file your IRS in Portugal.

IVA: VAT

IVA is VAT. The standard rate on the mainland is 23% (Madeira and the Azores have their own rates, and reduced and intermediate rates apply to some goods and services). Freelancers under the Art. 53 CIVA exemption don't charge it.

The Art. 53 exemption: You're exempt if your turnover in Portugal in the previous calendar year did not exceed €15,000. Income from services to foreign business clients doesn't count toward that figure. Exporting goods outside the EU rules the exemption out at any turnover. If you go over €15,000 in a year, the exemption ends on 1 January of the next year. If you go over €18,750, it ends immediately, and the invoice that crosses the line must already carry VAT.

When you're exempt, your invoices carry the mention "IVA - regime de isenção" and no VAT on top. You don't file periodic VAT returns for your own sales. The most common exception is buying services from a foreign supplier (a US software subscription, for example): you self-assess VAT on those, on a Declaração Periódica, from the first such invoice.

When you're in the normal regime, you charge VAT on your domestic invoices (on the mainland, 23% at the standard rate), file VAT returns (Declaração Periódica), usually quarterly (monthly from €650,000 of turnover or by choice), and pay the difference between the VAT you charged and the VAT you can deduct on your own purchases.

Quarterly deadlines: VAT returns are filed by the 20th of the second month after each quarter ends, and the VAT is paid by the 25th. Q1 (January through March) is filed by May 20. Q2 (April through June) moves to September: filing by September 20 and payment by September 25, under a permanent rule in the VAT code (Art. 41.º n.º 10 and Art. 27.º n.º 10 CIVA). Q3 is filed by November 20, Q4 by February 20. When a deadline falls on a weekend or holiday, it moves to the next working day.

EU clients are different. If you invoice a business in another EU country for a service, the service is outside Portuguese VAT and the client accounts for the VAT (reverse charge). The invoice carries exemption code 115 and the mention "IVA - autoliquidação". Before your first such supply you file a declaração de alterações with AT ticking intra-EU services, and Art. 53 status doesn't waive that. In the normal VAT regime the value also goes on your Declaração Periódica, and you file the Declaração Recapitulativa, a summary of your EU business clients, on the same cadence as your VAT returns. On the Art. 53 exemption you no longer file the recapitulativa: DL 35/2025 removed that obligation for exempt taxpayers, for operations carried out from 1 July 2025 onward.

For the full breakdown of the Art. 53 exemption and what happens when you cross it, see VAT in Portugal as a solo entrepreneur.

Social Security contributions

Segurança Social contributions are separate from IRS, paid to a different authority (Instituto da Segurança Social), and have their own rhythm: declared quarterly, paid monthly between the 10th and the 20th.

How the calculation works: The general SS rate is 21.4% of your contribution base (an ENI with an exclusively commercial or industrial activity pays more). For service providers, relevant income is 70% of the income from the quarter before the declaration, and the monthly base is one third of that. So if you invoiced €12,000 in the preceding quarter, your relevant income is €8,400, the monthly base is €2,800, and you pay about €599 a month for the next three months.

In practical terms, SS costs service providers about three euros of every twenty they bill, with two limits: while you are contributing, the contribution never falls below €20.00 a month, and the monthly base is capped at 12 times the IAS. Some people are exempt from contributing altogether, among them pensioners and employees whose freelance income stays under a set multiple of the IAS, subject to conditions.

The first year: a first-time freelancer does not contribute to Social Security until the first day of the 12th month after starting activity, so nothing is owed before then. From that date until your first quarterly declaration, you pay a fixed €20.00 a month. That's a meaningful cash-flow advantage at the start, but plan for the full contributions once your first declaration sets them. If you have been self-employed before, the obligation usually starts in the month you restart.

Quarterly declarations: SS declarations are filed in January, April, July, and October, by the last day of the month. Each declaration covers the income from the three preceding months. You file them on Segurança Social Direta, the Social Security portal.

The full guide to quarterly SS declarations is in How to file your quarterly Social Security declaration in Portugal.

The portals you need

Each authority has its own system:

Portal das Finanças: where you file IRS (Modelo 3), manage VAT declarations, and access most AT services.

e-Fatura, inside the Portal das Finanças: where you see the invoices issued to your NIF. If you work in your own name, you classify the business ones as activity expenses by the end of February of the following year so they count toward the 15% documented-expenses requirement. Invoices from foreign suppliers never reach e-Fatura. Purchases from suppliers in other EU countries are declared on the IRS return itself instead (Anexo B, Quadro 17A).

Segurança Social Direta: where you manage SS contributions, declarations, and payment references.

What "no accountant" actually means

You can file all three obligations yourself. A sole trader on the simplified regime does not need a certified accountant: AT computes the IRS from what you declare. VAT is formulaic if you're exempt. SS declarations are manual but follow a consistent calculation.

Where it gets genuinely complicated: if you had foreign income from multiple countries, if you're assessing NHR or IFICI eligibility, or if you're dealing with a back-year correction. Those situations benefit from a contabilista certificado (certified accountant). If you move to organised accounting, a certified accountant is required by law, because only they can sign the declarations built on it.

For the common expat freelancer situation (one business, one country of residence, services to a mix of Portuguese and foreign clients), the mechanics are learnable and manageable without ongoing professional help.