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In short: IRS is Portugal’s progressive personal income tax. In 2026 it applies nine brackets, from about 12.5% up to 48%, but only the slice of income within each bracket is taxed at that rate — not your whole salary. Tax is collected through the year via withholding at source and reconciled in the annual return (filed between 1 April and 30 June, for the prior year’s income). Deductions reduce the tax due. The figures shown are 2026 reference values; confirm them with official sources. This is educational information, not tax advice.

Income Tax Basics (IRS) in Portugal

Kontoo editorial team · Updated 06/24/2026

In Portugal, personal income tax is called IRS. It is progressive: higher earners pay a larger percentage only on the part of their income that falls into the upper brackets. The fiscal year matches the calendar year (1 January to 31 December) and the return is filed the following year. This chapter explains the essentials — brackets, withholding at source, deductions and VAT — with reference figures for 2026. It is educational material: for your specific situation, always confirm with official sources or a certified accountant.

Know what counts as income: salaries (category A), self-employment / green receipts (category B), rents, capital and capital gains each have their own rules.
Understand progressivity: 2026 IRS has nine brackets, with rates from about 12.5% on the first euros up to 48% on the part of income above roughly €86,600 per year.
Learn about withholding at source: during the year your employer withholds part of your salary on account of tax; the annual return then refunds or charges the difference.
Use deductions: there is an automatic specific deduction (about €4,587 for employees in 2026) plus expense-based deductions (health, education, housing, invoice VAT) validated in the e-Fatura system.

What matters

IRS (Imposto sobre o Rendimento das Pessoas Singulares) is the backbone of income taxation in Portugal. It works by category: category A covers employees, category B covers the self-employed, and there are also property, capital and capital-gains income with specific rules. Tax falls on taxable income — income after the specific deduction and other rules — not on the gross salary. The structure is progressive. In 2026 the nine brackets remain, with limits raised by about 3.5% so that pay rises do not push taxpayers into higher brackets purely through inflation. Marginal rates run from about 12.5% in the first bracket (up to roughly €8,342) to 48% on the part of income above about €86,634. The key point is that each bracket only taxes its own slice of income. During the year, tax is collected through withholding at source: the employer deducts a monthly estimate and pays it to the State. Low salaries around the national minimum wage can be exempt from withholding. The following year, the annual return reconciles everything: if too much was withheld there is a refund; if too little, you pay the difference. Deductions ease the burden. There is an automatic specific deduction (about €4,587 for employees in 2026) and tax-credit deductions for health, education and housing expenses, plus VAT on certain invoices, validated in e-Fatura. Separately, consumption is taxed via VAT, with a standard rate of 23% on the mainland, an intermediate rate of 13% and a reduced rate of 6% (the Autonomous Regions of the Azores and Madeira have lower rates). All figures are 2026 reference values — for your specific case, always consult the Tax Authority. This text is educational and is not tax advice.

ExampleSimplified example (as of 2026, rounded figures). Suppose taxable income of €20,000. Tax is charged in slices: the first ~€8,342 at 12.5% (~€1,043), the slice from ~€8,342 to ~€12,587 at 15.7% (~€666), from ~€12,587 to ~€17,838 at 21.2% (~€1,113), and the remaining ~€2,162 up to €20,000 at 24.1% (~€521). Approximate total IRS: about €3,340 — an average rate of roughly 17%, well below the bracket’s 24.1% marginal rate. This is illustrative and ignores tax-credit deductions; your real figure depends on your case.

To project how tax savings grow over time, try Kontoo’s compound interest calculator. For official figures and deadlines, always check the Tax Authority’s Portal das Finanças.

In depth

Taxable income vs. gross income

IRS does not fall on gross salary but on taxable income — what remains after the specific deduction and other rules. As a result, the effective rate you actually pay is generally well below your bracket’s marginal rate.

Pooling vs. flat (liberatória) rates

Some income (interest, dividends) is taxed at a separate flat rate (taxa liberatória, generally 28%) outside the brackets, but you can opt to pool it (englobamento) if that is more favourable. This is a case-by-case decision; when in doubt, consult a certified accountant. Note: this chapter is educational and does not replace professional tax advice.

Where to confirm official figures

Brackets, withholding tables and deadlines are set each year by ministerial order and published by the Tax Authority on the Portal das Finanças and in the Diário da República. Because these numbers are volatile, always confirm the rate in force before making decisions.

Checklist

IRS is progressive: only the slice of income within each bracket is taxed at that bracket’s marginal rate.
The fiscal year is the calendar year; the 2026 return (2025 income) is filed between 1 April and 30 June.
Withholding at source is a monthly advance; the final reconciliation happens in the annual return.
Mainland standard VAT is 23%, with intermediate (13%) and reduced (6%) rates; the Azores and Madeira are lower.

Common myths

Myth: Moving into a higher bracket leaves me with less take-home pay.

Reality: False. Because rates are marginal, only the part of income above the limit is taxed at the higher rate. A gross pay rise almost always means more net income.

Myth: Withholding at source is the final tax.

Reality: No. Withholding is only an on-account payment during the year. The final tax is settled in the annual return, which can lead to a refund or an extra payment.

Frequently asked questions

When is the IRS return filed in 2026?

The return for 2025 income is filed between 1 April and 30 June 2026, a single deadline for all taxpayers, through the Portal das Finanças (automatic IRS or the Modelo 3 form). Before that, there are March dates to validate invoices in e-Fatura and update your household. As of 2026, confirm the exact dates with official sources.

If I move into a higher bracket, is my whole salary taxed at that rate?

No. Rates are marginal: each slice of taxable income is taxed at its own bracket’s rate. Moving up a bracket only raises the rate on the part above the previous limit, never on your entire income.

Do self-employed (category B) workers have different withholding?

Yes. The self-employed have their own rules: in 2026, those whose income did not exceed €15,000 in the prior year may be exempt from withholding, and the most common withholding rate on services is 23%. As of 2026, check your specific situation.

All lessons · Glossary · Editorial · Kontoo does the math and explains – this is general education, not tax, legal or financial advice.

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