Bonuses, commissions and stock options in Portugal: how much tax you actually pay (2026)

The company paid you a 3,000 euro bonus and the payslip shows 1,380 euros withheld. Looks like robbery. It is not. Monthly withholding applies the bracket rate of someone who earns that amount every month, and you do not. At year end, you get the difference back.

This guide walks through the three most common cases for someone working in Portugal: performance bonus, sales commissions, and stock options or RSUs. What tax applies, when, what you recover at year-end, and the mistakes that cost real money.

Performance bonus, the typical case

The base rule is simple. A cash bonus is treated like salary in the month it is paid. It adds to that month's pay, pushes you up a bracket, and the withholding for that month is bigger. Social Security 11% also applies on the bonus.

In legal terms:

• Art. 2 n.º 1 a) CIRS: Category A income includes salary, commissions, premiums, gratuities, and any other compensation derived from the employment relationship.
• Art. 99 CIRS: withholding is applied to the total monthly pay.
• Contributions Code Art. 46: Social Security 11% on all Category A income.

How your payslip should show the bonus

Three lines a correct payslip must have, under Decree-Law 187/83:

1. Bonus / Premium with gross amount on a separate line.
2. SS deduction (11%) on the total Category A for the month.
3. IRS withheld on the total Category A for the month.

If the payslip "hides" the bonus inside base salary, that is a problem, and may also hide under-reporting to Social Security. Ask HR for written clarification.

Commissions, treated like salary with nuances

Commissions are Category A income — there is no special tax treatment. Every euro of commission pays 11% SS and IRS withholding.

But there are practical nuances that change your net:

Regular monthly commissions. Add to base salary in each month. They can push you to a higher bracket if they vary a lot. Example: 1,800 euros in January and 3,500 in June after a strong campaign means proportionally bigger withholding in June.

Annual or seasonal commissions. Behave like a bonus, with a withholding spike in the month of payment.

Commission advances. The company advances and adjusts later. If the adjustment is negative, the company can deduct from salary, but only with your written authorisation or a specific contract clause (Art. 279 CT).

Key point on commissions, the acquired right

Commissions earned by meeting objectives defined in the contract or regulation are wages. If the company fails to pay, this is a wage default, with legal consequences:

• After 30 days late, you can issue a formal demand (Art. 323 CT).
• After 60 days, the door opens to resign for just cause (Art. 394 CT n.º 5).
• Late payment accrues 4%/year statutory interest.

Stock options and RSUs, the most technical part

There is more regime here. Let me go through the main pieces.

What each thing is

• Stock option — the right to buy company shares at a defined price (strike price) within a defined period. You are not an owner until you exercise.
• RSU (Restricted Stock Unit) — company promise to give you shares in the future, in defined dates (vesting). On vesting, you become the owner.
• Free shares — you receive shares without paying. Less common in Portugal.

When IRS is triggered

The base rule of CIRS:

Worked example. You receive 100 RSUs valued at 50 euros each at vesting. You have 5,000 euros of Category A that month, adding to salary and paying marginal IRS plus 11% SS. If the share later climbs to 70 and you sell, the additional 2,000 euros are Category G capital gain (28% flat = 560 euros tax).

The startup regime under Lei 21/2023

This is the part that can change your tax bill substantially. Lei 21/2023 amended Art. 43-C of the EBF (Tax Benefits Statute) to create a special regime for employees of startups and scaleups.

Who qualifies:

• The company must be certified as a startup or scaleup under Lei 21/2023.
• The stock option or RSU plan must be part of a formal plan approved by the company.
• Applicable to employees and directors.
• General rule: you must hold the options or shares for at least 1 year before exercising or selling.

Tax advantages when qualifying:

1. Deferred taxation. No tax at vesting or exercise. Tax only on share sale.
2. 50% exclusion. Only half of the gain enters the taxable base.
3. 28% flat rate. No marginal rate stacking.

Caveat: the regime has technical detail (startup certification, plan requirements, holding rules). [Common interpretation:] internationally growing tech firms adopt it often; traditional Portuguese SMEs rarely. Always confirm with HR or a tax advisor before assuming the regime applies.

Bonuses in kind, vouchers, trips, gifts

They do not escape IRS. Art. 2 n.º 3 b) of CIRS is clear: anything you receive because of your job is Category A income, in cash or in kind.

Typical cases:

• Gift cards / vouchers — market value is income.
• Incentive trips — cost value is income.
• Company car for personal use — taxed by the specific table in Art. 2 n.º 3 b) point 9.
• Equipment (phone, laptop) for personal use — only counts if granted as a personal benefit, not as a working tool.

Exceptions (no tax):

• Symbolic occasional gifts of small value (Christmas, wedding, birth). Tax Authority interpretation.
• Meals during business travel.
• Meal allowance up to the daily limits (6.15 euros in cash, 10.46 euros on a card; see the dedicated guide).

[Common interpretation:] If the company pays a Dubai trip as a "yearly sales prize" and does not tax it, the Tax Authority can deem it abuse and demand payment with interest. If the company also fails to pay SS, it pays with surcharge.

Reading your Modelo 3 and seeing if you recover

At year end (May the following year), you file IRS Modelo 3. The Tax Authority compares two numbers:

1. IRS withheld during the year (sum of monthly withholdings).
2. IRS actually due (calculated on total annual income).

If 1 > 2 you get a refund. If 1 < 2 you owe additional tax.

For people who got a sizable bonus, the chance of a refund is high, because monthly withholding used a higher rate than the annual average.

Where you check: Annex A (Category A income) of Modelo 3. Cross-check with payslips. If the company under-reported, raise the discrepancy via Portal das Finanças.

5 common mistakes that cost money

1. "Withholding was huge, I was robbed." As above. In most cases, you recover at Modelo 3.

2. Not declaring share-sale capital gains. If you exercised stock options and sold, the gain is Category G — goes in Annex G of Modelo 3. Forgetting triggers a fine.

3. Accepting a bonus "off the books". If the company offers a direct transfer without payslip, that is tax evasion. Do not accept. If the company is audited, you are partially liable.

4. Treating trips and vouchers as tax-free extras. They are not. They are Category A. If the company did not tax, the company is jointly liable, and you must still declare even if the company does not.

5. Not checking SS on the bonus. In some schemes, the company pays IRS but "forgets" SS. Check Segurança Social Directa within 30 days after the bonus and confirm the amount appears in your statement.

How to bring it together

Practical path:

Step 1: before receiving. Ask HR how it is calculated, in which month it is paid, and how it appears on the payslip.

Step 2: when you receive it. Check the payslip (separate line for bonus), confirm SS in the statement, keep the email or regulation that defines the criteria.

Step 3: at Modelo 3 (next May). Cross-check Annex A, declare share-sale gains in Annex G if applicable, calculate refund or additional tax owed.

You do not have to do everything at once. Pick the piece that helps now:

• If you want to see net impact: gross-to-net salary calculator.
• If the company has not paid commissions: late wage interest calculator and unpaid wages guide.
• If you want to compare contract vs. self-employment: employee vs. self-employed calculator.
• If the company abused you and you want to leave: resignation for just cause template.