How to organize shift work in Brazil after the end of the 6x1 schedule

A poorly designed shift roster usually shows up first in operations: handovers without coverage, recurring overtime, fatigue, absenteeism and trouble keeping skilled crews. Payroll and labor litigation follow soon after. Knowing how to organize shift work in Brazil therefore takes more than filling in a spreadsheet, and the task became harder with Constitutional Amendment No. 141/2026, which cuts the maximum working week from 44 to 40 hours and guarantees two days of paid weekly rest.

The change arrives in two steps. On December 16, 2026, the weekly cap falls to 42 hours and the second rest day becomes mandatory. On December 16, 2027, the cap reaches 40 hours. Pay cannot be reduced at either stage. For companies running round-the-clock operations with rotating crews, 12x36 schedules or night work, this means rebuilding rosters that have worked for years.

Multinational groups need extra care. Headquarters often apply global continuous-coverage standards, but in Brazil the local roster must fit the Federal Constitution, the Consolidation of Labor Laws (CLT), the applicable collective agreements and the reality of each site. The legally sound answer is not always the one that looks most efficient in the short term.

What Constitutional Amendment 141/2026 changed

Constitutional Amendment No. 141/2026, which originated as proposal PEC 221/2019, was promulgated by the boards of both houses of Congress and published in the Official Gazette on October 16, 2026. Constitutional amendments in Brazil do not require presidential sanction. The text amends Article 7 of the Constitution:

• item XIII now caps normal working time at 8 hours a day and 40 hours a week, while still allowing hours to be offset or reduced by collective agreement;
• item XV now grants two days of paid weekly rest, one of them preferably on Sunday;
• a new paragraph 2 allows, as an exception and only through a collective agreement, an arrangement that averages two rest days per week over the calendar month, with at least one rest day in every week worked;
• a new paragraph 3 lets future statutes create special working-time and rest regimes, provided they stay within items XIII, XIV and XV.

Item XIV, which sets a 6-hour day for uninterrupted rotating shifts, was left untouched.

The remaining articles of the amendment govern the transition. The reduction applies to existing employment contracts, with no nominal, proportional or any other kind of pay cut, wage floors included (Art. 2). Clauses of collective agreements on working time and rest that conflict with the new rules lose effect two months after publication, even if the agreement itself is still in force (Art. 3). Employees already working 40 hours or less keep their hours but gain the second rest day (Art. 4).

Some news outlets reported December 15 as the start of the first stage, counting 60 calendar days. The amendment speaks of two months, a period that, counted from October 16, ends on December 16, 2026.

A note on terminology: in Brazil, a collective bargaining convention (CCT) is signed between the unions representing workers and employers of a sector, while a collective agreement (ACT) is signed directly between a company and the workers' union. The amendment treats both as valid instruments for the flexibility it allows.

How to organize shift work in Brazil on a sound legal basis

The first step is still to identify the working model the company actually uses. An operation with fixed shifts, in which each employee always works the same hours, is different from uninterrupted rotating shifts, in which employees alternate between day and night periods so the operation never stops.

For rotating shifts, the Constitution sets a 6-hour day unless a collective agreement provides otherwise (Art. 7, XIV). The Superior Labor Court (TST) accepts longer shifts, capped at 8 hours, when set through valid collective bargaining (Precedent 423). Three shifts are not required: under Case Law Guideline 360 of the TST's First Subsection for Individual Disputes (OJ 360 SDI-1), rotating between two shifts that cover, in whole or in part, daytime and night-time hours is enough to trigger the special 6-hour regime. The internal name of the roster does not control; what matters is how the work is actually performed.

If employees rotate through hours that span day and night, including periodic rotation, the company may be operating a rotating-shift regime even if the roster is called something else. Working longer than six hours in that setting, without the corresponding collective agreement, increases exposure to overtime claims and their knock-on effects on other payments.

Rotating shifts after the amendment

The amendment kept the 6-hour rule of item XIV, but the two rest days and the new weekly cap also apply to rotating crews. That combination is where many industrial rosters stop working.

Take a 6x2 roster (six days on, two off) with 8-hour shifts. It averages close to 42 hours a week and, on that measure, fits the transition cap. The problem is rest: two days off in every eight equals 1.75 per week, below the average of two that the new paragraph 2 requires even when a collective agreement is in place. That cycle will have to be redesigned by December 16, 2026.

For 6-hour rotating shifts without a collective agreement, the numbers are tighter still. Six hours over six days added up to 36 hours a week. With two mandatory rest days and the 6-hour daily limit unchanged, the week tends to close at 30 hours, for the same pay. Article 4 of the amendment spares employees already at 40 hours or less from a proportional cut, but it does not appear to authorize going beyond six hours a day. On the safer reading, spreading the 36 hours over five days requires collective bargaining. The courts have not yet ruled on the point.

12x36 schedules and the 40-hour cap

The 12x36 schedule (12 hours on, 36 hours off) remains common in operations that need continuous coverage. Article 59-A of the CLT allows it by written individual agreement, collective convention or collective agreement, and the Federal Supreme Court (STF) upheld the individual-agreement route in ADI 5994, decided in 2023. Amendment 141 neither repealed nor mentioned that provision.

The difficulty is arithmetic. Twelve hours over three and a half shifts a week averages 42 hours, which fits the transition cap but exceeds 40 hours from December 16, 2027. Two questions also remain open: whether a day without a shift counts as one of the two weekly rest days, and whether an individual agreement is still enough now that the Constitution requires collective bargaining to average rest days over the month. Until a specific statute or court guidance appears, 12x36 rosters deserve review on the same timetable as any other.

Fixed shifts, rotation and on-call are not the same thing

Using these concepts loosely leads to poor decisions. On a fixed night shift, for example, the employee may fall outside the constitutional rotating-shift regime but remains subject to night-work rules and, now, to the general limit of 8 hours a day and 42 or 40 hours a week. For on-call arrangements, the company must assess whether there is actual work, standby (sobreaviso) or mere availability, since each has different effects on pay and working time.

The analysis also varies by sector. Manufacturing, distribution centers, mining, transport, technology, healthcare and security may share operational needs and still be covered by very different collective agreements. The correct reference is the company's predominant activity, the professional category and the union coverage that applies to each site and its employees.

Build the roster from operational needs and rest limits

A sustainable roster starts by mapping the coverage required: which posts must run continuously, what the volume is by time slot, which roles require double checks and where immediate replacement is needed. With that data, the company defines crews, start and end times, work cycles, days off and objective criteria for shift swaps.

Sizing the roster only by the minimum headcount per shift is a common mistake, and it is now more expensive. Vacations, social security leave, mandatory training, seasonal peaks and unplanned absences must be built in. By the end of the transition, each employee will offer up to four fewer hours a week, roughly 9% of the previous load. Without coverage margin, the operation shifts every contingency onto overtime, which raises cost and the risk of breaching legal limits.

In practice, a consistent review should cover at least six fronts:

• actual daily and weekly hours for each roster, already measured against the 42-hour and 40-hour caps;
• two rest days per week or, where a collective agreement allows it, the monthly average under paragraph 2;
• the minimum rest between shifts, especially at cycle changes;
• meal and rest breaks;
• how often overtime occurs and how it is paid or offset, time banks included;
• the collective agreement clauses that will lose effect on December 16, 2026.

The CLT requires a break of at least one hour for continuous work exceeding six hours and 15 minutes when work exceeds four hours but not six (Art. 71), subject to specific statutory or negotiated exceptions. Between two working days, the minimum rest is 11 consecutive hours (Art. 66). In rotating systems, the TST holds that hours worked right after the weekly rest, at the expense of those 11 hours, must be paid as overtime (Precedent 110). With two rest days, cycle changes need to be recalculated so the combined rest is still respected. A seemingly simple shift swap can breach the rule when an employee stays past the end of a shift or is called back early the next day.

Weekly rest deserves particular attention. Until December 15, 2026, the rule is 24 consecutive hours (CLT, Art. 67). From then on, it is two days a week. The constitutional text does not require them to be consecutive or to fall on the weekend, but one of them should preferably be a Sunday. The monthly average under paragraph 2 exists only through collective bargaining and allows no week without rest, and the TST already considered rest granted after the seventh consecutive working day to be irregular (OJ 410 SDI-1). Where work on Sundays and public holidays is involved, sector-specific statutory rules, authorizations and collective agreements continue to apply.

Night work: cost, health and accurate records

For urban workers, night work is work performed between 10 p.m. and 5 a.m. It carries a premium of at least 20%, and each night hour counts as 52 minutes and 30 seconds (CLT, Art. 73). When a shift worked entirely during the night period runs past 5 a.m., the premium also applies to the extended hours (TST Precedent 60, item II). Rosters that run through the early morning need careful configuration in timekeeping and payroll systems.

Amendment 141 did not change these rules, but it changes the base they are calculated on. With the same salary paying for fewer hours, the hourly rate rises, by simple proportion, by about 4.8% in the 42-hour phase and 10% in the 40-hour phase. Night premiums, overtime and every other hour-based payment follow that increase. For a 40-hour week, the TST already applies a monthly divisor of 200 hours (Precedent 431); for the 42-hour stage, the courts have not yet settled the divisor.

Rural work follows different hours: from 9 p.m. to 5 a.m. in crop farming and from 8 p.m. to 4 a.m. in livestock farming, with a 25% premium and no reduced night hour (Law No. 5,889/1973, Art. 7). Agribusiness groups need to keep this distinction in mind. Collective agreements may set more favorable terms, such as higher premiums, specific rules for extended night work or particular offset arrangements.

Beyond pay, night-shift management is a health and safety matter. Frequent switching between day and night tends to increase fatigue and make employees' routines less predictable. Not every operation can run fixed shifts, but where rotation is necessary the company should assess cycle length, rotation sequence and prevention measures suited to its occupational risks. The redistribution of days off required by the amendment is an opportunity to review those cycles with health criteria in mind, not only coverage.

Formalize the rules and keep the evidence

A roster that can be defended in court has to be reflected in the company's documents and systems. Employment contracts, internal policies, regulations, individual agreements, collective instruments, time records and payroll settings must be consistent with one another. A gap between what is written and what happens on the shop floor or in the operations center is a recurring source of liability.

Establishments with more than 20 workers must record start and end times, manually, mechanically or electronically (CLT, Art. 74, paragraph 2). Under Amendment 141, timekeeping systems will need to be reconfigured twice, for December 16, 2026 and December 16, 2027, with alerts for days longer than 8 hours without a collective agreement and for work sequences without the required rest. Changes to contractual hours should be formalized in writing and reported through eSocial, the government's employment reporting system. Informal adjustments made through messages, side spreadsheets or managerial tolerance weaken the company's evidence in any future dispute.