Night Work in Portugal12 minutos de leitura

Night work in Portugal is one of the most regulated areas of the Labour Code. It carries a mandatory 25% premium, a strict legal definition of what counts as “night” hours, mandatory medical surveillance, enhanced protections for vulnerable workers, and specific registration obligations for employers. Mistakes in classifying workers, calculating the premium, or scheduling pregnant or minor workers at night produce heavy fines from ACT and valid individual claims.

This guide systematises the regime of Article 266 of the Portuguese Labour Code (Lei 7/2009, updated by Lei 13/2023), combined with Articles 223-224 (definitions), Article 155 (medical exams) and Articles 87-90 (vulnerable worker protections). It is written for international business owners, HR managers, and operations leads running teams in Portugal who need to understand when the night premium applies, who qualifies as a “night worker,” and what the attendance system must capture.

What counts as night work under the Labour Code

Article 223 of the Labour Code defines night work as work performed in a period that includes at least seven hours between 22h00 and 07h00. The default statutory night window runs from 22h to 07h — but an IRCT (sectoral collective agreement) can shift this window, provided it includes the mandatory period between 00h and 05h and totals at least seven hours.

Three practical consequences flow from this definition:

1. Any hour worked inside the night window counts as a night hour and triggers the premium — not only full night shifts.
2. A worker finishing at 23h30 or starting at 05h30 has night hours even if the rest of the shift is daytime.
3. IRCT variations of the night window are common in healthcare, security, and transport — always check the applicable collective agreement.

The night window: 22h to 07h

Unless an IRCT provides otherwise, the statutory night window is 22h-07h. This matters for two separate calculations: (a) which hours are paid with the 25% premium, and (b) whether a worker meets the legal threshold to be classified as a “night worker” with the additional protections of Article 224.

Common IRCT variations found in Portuguese sectors:

The 25% premium: Article 266

Article 266 of the Labour Code sets the mandatory night premium at 25% of hourly base pay, applied over each hour worked in the night window. The premium is cumulative with any other premium legally due (shift, risk, availability), unless the IRCT explicitly consolidates them.

Three important exceptions and nuances:

• IRCT incorporation: an IRCT may incorporate the 25% premium into a higher base pay specific to night workers, eliminating the separate premium line. Common in healthcare and security CCTs — but it must be explicit in the agreement.
• Workers exclusively hired for night work: when a contract is signed specifically for night work, the IRCT may provide a flat higher base pay instead of the 25% add-on.
• Shift premium: for workers in rotating 3×8 shifts, the shift premium (paid under IRCT) and the night premium accumulate — one does not replace the other.

Base of calculation is the hourly base pay. In Portugal, hourly rate = (monthly base pay x 12) / (52 x weekly hours). The 25% is applied over that hourly rate, per night hour.

How to calculate the night premium: practical example

Night premium formula (Article 266 Portuguese Labour Code):

• Hourly rate = Monthly base pay ÷ (52 × weekly hours ÷ 12) ≈ Monthly ÷ 173.33 (40h week)
• Premium per night hour = Hourly rate × 25%
• Monthly premium = Premium per hour × number of actual night hours in the month

Practical example (security guard earning Portuguese National Minimum Wage approximate for 2026):

• Base pay: ≈ €870-920/month (check the current value published in the Lei do Orçamento do Estado in force)
• Hourly rate: 870 ÷ 173.33 ≈ €5.02 (or 920 ÷ 173.33 ≈ €5.31)
• Premium per night hour: €5.02 × 25% ≈ €1.26
• For 16 night hours in the month: 16 × €1.26 ≈ €20 monthly premium
• For months with more hours (e.g. 60 night hours): 60 × €1.26 ≈ €75 monthly premium

Note: the Portuguese National Minimum Wage is updated annually by the State Budget Law. Check the current value in DRE. If an applicable sectoral IRCT exists, the premium may be higher than 25% or incorporated into higher base pay (e.g. security, private healthcare CCTs) — see your activity’s CCT at BTE.

Manual calculation of this premium every month is error-prone (typically 5-15%). Time clocking software with sectoral IRCT preset calculates automatically, identifying hours falling in the 22h-07h window (or window defined by CCT) and applying the correct percentage.

Who is a “night worker”: Article 224

Not everyone who occasionally works at night is a “night worker” for legal purposes. Article 224 defines the night worker as someone who:

1. Performs at least three hours of daily work in the night period on a normal basis, OR
2. Is likely to perform at least a certain portion of annual working time at night as determined by IRCT (typically one third of annual hours, or more than 20 night hours per week).

This classification matters because night workers trigger additional obligations: mandatory medical surveillance (Article 155), limits on daily working time (8h average, 10h absolute), right to transfer to day work on medical grounds, and employer registration obligations with ACT.

Mandatory medical exams: Article 155

Under Article 155 of the Labour Code and the health and safety regime (Lei 102/2009), employers must organise medical surveillance for night workers:

• Before assignment to night work: pre-assignment medical exam to verify fitness.
• Annually thereafter: periodic exam while the worker remains on night duty.
• On request: whenever the worker reports health symptoms linked to night work.
• Transition right: if the medical doctor certifies that night work is damaging health, the worker has the right to transfer to an equivalent day position where available.

Exam results are confidential — only fitness/unfitness is communicated to the employer. Records must be kept for at least five years and are a common ACT inspection target in sectors with regular night work.

Protection of vulnerable workers

Articles 87-90 and 60-62 of the Labour Code prohibit or restrict night work for specific categories:

1. Pregnant workers: right to be dispensed from night work with medical certificate, with alternative daytime schedule or paid leave if alternative is not possible.
2. Postpartum workers (up to 112 days after birth): same protection as pregnancy.
3. Breastfeeding workers: dispensation from night work for the duration of breastfeeding on medical certificate.
4. Minor workers (under 18): generally prohibited from night work between 22h and 07h, with narrow exceptions for specific sectors and age brackets.
5. Workers with chronic illness or disability: right to be exempted from night work on medical justification.

In each case, the dispensation must be documented in writing with supporting medical certificate, and the employer must provide a compatible day schedule or, if genuinely impossible, pay subsidy / parental leave as applicable. Scheduling a protected worker at night without this documentation is one of the highest-risk compliance failures.

Interaction with shift work (Articles 220-224)

Night work frequently appears inside shift rotations — classic 3×8 or 12×12 patterns. The two regimes stack:

• Shift workers rotating through a night shift are entitled to both the applicable shift premium (per IRCT) and the Article 266 25% night premium for hours inside the night window.
• Shift workers who meet Article 224 criteria (3h+ daily night work or threshold annual night hours) are classified as night workers and acquire medical surveillance rights.
• Daily rest (11h), weekly rest (35h), and complementary rest (Article 224) all apply unchanged in night-shift rotations.

IRCTs in healthcare, security and continuous industry often incorporate the night premium into the shift pay scale — read the agreement carefully before assuming the 25% must be paid as a separate line.

Daily working time and rest periods

Night workers have reinforced limits on working time:

1. 8-hour average daily limit calculated over the reference period defined by IRCT (typically 7 days or one month).
2. 10-hour absolute daily limit on any individual day of night work, unless IRCT allows exceptions for specific sectors.
3. 11h daily rest between the end of a night shift and the start of the next shift.
4. 35h weekly rest (24h continuous rest day + 11h daily rest) — in continuous shift operations this day rotates and is not necessarily Sunday.

Workers whose job involves specific risks or significant physical/mental strain cannot exceed 8 hours per 24 hours when working at night (no averaging allowed).

Attendance recording and premium calculation

The attendance system must capture night work with precision because the 25% premium is calculated per night hour, not per night shift. Required features:

• Precise timestamps for every clock-in and clock-out (Article 202).
• Automatic flagging of hours falling inside the night window (22h-07h or the IRCT-adjusted window).
• Correct handling of shifts that straddle the window — e.g. 18h-02h shift produces 4 night hours (22h-02h) with 25% premium.
• Separation of night premium from shift premium in the pay export.
• Night worker classification tag per employee, triggering medical exam calendar reminders.
• Flag for protected workers (pregnancy, minor, chronic illness) blocking any night assignment without documented dispensation override.
• 5-year retention of all records for ACT inspection.

Manual spreadsheets routinely produce 10-20% error rates on night premium calculation — hours straddling the window, DST transitions, and shift swaps are the top sources of miscalculation. Portuguese cloud attendance with night-window presets automates almost all of this.

Most common errors

1. Treating the whole shift as “night” when only part falls in the window — overpaying premium.
2. Treating the whole shift as “day” when it starts at 21h30 — underpaying premium (ACT finding).
3. Applying IRCT night window without checking current CCT version in BTE.
4. Not scheduling the pre-assignment medical exam before placing a worker on night duty.
5. Scheduling a pregnant/breastfeeding worker at night without medical dispensation on file.
6. Minor worker scheduled past 22h — strict liability violation.
7. Shift premium replacing night premium when IRCT does not consolidate them.
8. No audit trail connecting attendance records to payroll night-hour totals.
9. DST transition weeks miscounted (losing or duplicating one hour of night work).
10. Failing to register the night work regime in the social security/ACT reporting where mandatory.

HR checklist for night work compliance

• Applicable IRCT identified; night window and premium rules documented.
• Night premium 25% configured in payroll (or absorbed into base pay per IRCT, with written justification).
• Night worker classification applied to each eligible employee under Article 224.
• Pre-assignment medical exam completed and filed before first night shift.
• Annual medical exam calendar in place for all night workers.
• Pregnancy/postpartum/breastfeeding/minor/chronic illness status flagged and blocking night scheduling.
• Attendance system flagging night hours automatically with IRCT-correct window.
• Monthly reconciliation between attendance night-hour totals and payroll night-premium lines.
• Documented procedure for shift swaps that affect night-hour counts.
• 5-year archive policy for attendance records and medical exam results.
• Annual review of IRCT updates via BTE for night window / premium changes.

Official sources

• Portuguese Labour Code (Lei 7/2009), Articles 223, 224, 266 — Diário da República
• Lei 13/2023 (Agenda do Trabalho Digno) — dre.pt
• Autoridade para as Condições do Trabalho — act.gov.pt
• Occupational Health regime (Lei 102/2009) — dre.pt
• Sectoral IRCTs via BTE — bte.gep.msess.gov.pt

Conclusion

Night work in Portugal is a tightly regulated area that combines a mandatory 25% premium, a strict definition of the night window, enhanced medical surveillance, and strong protections for pregnant workers, minors and workers with chronic illness. For international business owners running operations in Portugal, the practical answer is almost always the same: adopt a Portuguese attendance system with the night window and IRCT variations configured, flag every protected worker, keep medical exam records current, and run a monthly reconciliation against payroll. Done well, night operations are compliant and audits produce clean results. Done poorly on Excel with manual premium calculation, ACT fines and worker claims are predictable.

This article does not constitute legal advice. For specific cases, consult a Portuguese employment lawyer.

Related reading

• Article 202 of the Portuguese Labour Code
• Workforce Attendance Management in Portugal
• PicaPonto vs Factorial vs Sesame
• ACT Labour Inspections in Portugal