Saturday bonus: The Silent Cost Trap

A service technician works regularly on Saturdays. So did his colleague in the IT department. Both have received the same supplement for three years, although there is nothing about it in the employment contract. When the company wants to stop payments as part of a restructuring, the conflict is inevitable: What appeared to be a voluntary service has long since become a legal claim.

This scenario is being repeated in thousands of German SMEs. Especially in IT service, business consulting and agenciesWhere working on Saturdays is a reality during project peaks or customer appointments, the remuneration often goes unexplained for years. The problem does not arise in the event of a dispute, it occurs in everyday life when no one clearly defines the rules and the billing varies from person to person.

How do you know that working on Saturdays is a risk for you

In many companies, the topic only becomes apparent when questions arise. Typical signs in everyday life include:

• Supplements are added later in Excel or via a timesheet
• Teams handle Saturday work differently
• HR and payroll work with different data sets
• Holidays must be checked manually for each location
• Employees repeatedly ask about the specific regulation
• There are no clear answers during audits or onboarding

As soon as several of these points apply, the coordination effort increases significantly. At the same time, the risk of billing errors and the different treatment of comparable cases is growing.

When Saturday Becomes a Billing Trap

According to the latest Microcensus of the Federal Statistical Office In 2024, around 25.1 percent of all employees worked regularly on Saturdays as well. Among self-employed people with employees, the proportion was as high as 43.3 percent. Saturday work is therefore not a marginal phenomenon; it is an integral part of everyday German working life.

Nevertheless, the question of remuneration remains unresolved in many companies. Typical situations where the problem breaks out:

In the last four years, an IT service provider with 45 employees has paid Saturday maintenance assignments with a flat Saturday supplement of 25 percent. There is no written agreement, neither in an employment contract nor in a works agreement. When Management Wants to Change the Remuneration to Pure Hourly Compensation, the Works Council Intervenes. Existing practice has established a claim.

A management consultancy employs two teams with different employment contracts. Team A receives a contract for Saturday assignments on customer projects, team B does not. A new HR manager only discovers the discrepancy during internal audit preparation. Retrospective corrections are complex and expensive at this point in time.

An agency pays for Saturday work in full the same way as normal weekdays because the managing director assumes that there is no legal requirement. That is true until he finds out that the agency is part of a collective agreement between the creative industries, which explicitly provides for a Saturday supplement.

In all three cases, the real cause is not bad faith, but a lack of systematism. Anyone who does not clearly define, document and uniformly remunerate Saturday work creates risks that only become apparent months or years later.

What Employment Law Really Says About the Saturday Supplement

Saturday is valid after Section 1 Federal Vacation Act As a regular working day. He is treated in the same way as Monday to Friday under employment law. As a result, there is no legal entitlement to a Saturday supplement.

While the Working Hours Act regulates rest periods, breaks, and maximum working hours, it does not include any provision requiring employers to pay additional compensation for work on Saturdays or weekends. Any entitlement to a Saturday supplement arises solely from one of the following legal bases:

Collective agreement: If a collective agreement applies to the company, the surcharge rates set there are binding. They apply regardless of whether individual employment contracts provide otherwise. Many collective agreements between trade, the metal and electrical industry and various service industries include explicit Saturday surcharges of between 20 and 50 percent.

Works agreement: If there is a works council and a Saturday supplement has been set in a works agreement, this claim is binding for all affected employees.

Individual employment contract: If there is a supplement for Saturday work in the employment contract, this must be paid.

Operational exercise: If an employer pays a supplement over a longer period of time (typically three times in identical form) without express reservation, a common law is created. Employees can then assume that this payment will be made permanently.

The Tax Side Deserves Special Attention: After Section 3b Income Tax Act Surcharges for Sunday, public holidays and night work are tax-free and social security up to certain limits. A Saturday supplement falls within this tax exemption only if Saturday is also a public holiday. A purely Saturday supplement is regularly subject to income tax and social security contributions, unless it can be combined with a tax-free surcharge share.

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When the Saturday supplement becomes mandatory

The operational exercise

Operational practice is the most common cause of unwanted obligations related to the Saturday surcharge. The Principle: If an employer regularly and consistently behaves in a specific way, employees can trust that this behavior will continue in the future.

In concrete terms, this means that anyone who pays a Saturday supplement three or more times without an express voluntary requirement creates a claim. In order to prevent this, every voluntary payment must be clearly and verifiably documented that no legal claim is established. “Voluntarily and without recognition of a legal obligation” is a phrase that is used in practice but must be consistent and in writing.

Check tariff commitment

Many employers in the project and service industry assume they are not bound by a collective agreement because they are not members of an employer association. In many cases, that is true. However, collective agreements can still apply. This can happen through generally binding declarations, reference clauses in employment contracts or membership in associations that are themselves subject to collective agreements. Employers are often not fully aware of this.

The same applies to the calculation and billing of night work surcharges. In these cases as well, the obligation usually arises from collective agreements rather than from statutory law.

Calculate surcharges correctly on Saturdays

If a Saturday supplement has been agreed, the basis for calculation is based on the underlying regulation. A percentage premium on the gross hourly wage is typical. With an hourly wage of 28 euros and an agreed Saturday supplement of 25 percent, this results in a supplement of 7 euros per hour worked on that day. Depending on the agreement, time off compensation may be granted as an alternative.

Combinations are possible: If a public holiday falls on a Saturday, the public holiday supplement applies, which can be up to 125 percent tax-free in accordance with Section 3b EStG. Saturday work that falls at night (after 11 pm), i.e. triggers an additional night supplement. Both surcharges are added, not multiplied.

Correctly depict Saturday work in everyday corporate life

This section determines whether a functioning process results from a theoretical regulation. It is crucial that Saturday work is consistently recorded, evaluated and transferred to billing from the very first assignment.

Step 1: Record the current situation in a structured way

Before regulations are amended, the current situation should be systematically included:

• Which employees work regularly or occasionally on Saturdays?
• How is Saturday work currently recorded?
• Which surcharges are actually paid?
• What are the differences between teams or locations?
• Which systems are involved in billing?

This inventory creates transparency and shows where risks already exist.

Step 2: Check the legal basis and contracts

If there is no collective agreement, the employer has room for manoeuvre. He can decide not to pay a Saturday supplement, introduce a supplement or offer time off. It is crucial that this decision is made in writing, either in an employment contract, in an additional agreement or in a works agreement, and applies uniformly to comparable groups of employees.

It is also important to differentiate between employee groups. Different contract levels within a company are often the cause of inconsistent practice.

Step 3: Define and document a uniform rule

Section 16 ArbZG Obliges employers to record working hours that exceed eight hours a day and to expressly document work on Sundays and public holidays. There is no explicit separate documentation requirement for purely Saturday work, but: Without proof of the actual hours worked, there is no legally secure basis for calculating the surcharge.

The scheme should clearly define at least the following points:

• When Saturday Work Is Available
• Whether a supplement or time off allowance is granted
• How high is the supplement
• For which groups of employees the rule applies
• How special cases are handled, such as holidays or night work

The more clearly these points are defined, the lower the need for coordination in everyday life.

In practice, the biggest problems arise when switching from time recording to payroll. Saturday work is recorded in Excel, manually transferred to a payroll program, where surcharge rates are entered incorrectly or the connection between time, day of the week and type of surcharge is lost.

Step 4: Systemically map surcharge logic

Saturday work should be done directly at time tracking can be linked to the relevant parameters:

• weekday
• Time
• Group of Employees
• Project context

As soon as this data is recorded in a structured manner, surcharges can be calculated automatically. This significantly reduces queries between project management, HR and payroll.

Step 5: Standardize Handover to Payroll

The connection between time tracking and payroll is the most common weak point in practice. Saturday work is recorded in one system, the surcharge is calculated in a second, and billed in a third. Each transition creates potential sources of error: incorrect hours, forgotten surcharge parameters, incorrect allocation to cost centers.

It becomes particularly problematic when a Saturday falls on a public holiday. In this case, the holiday surcharge rate should actually apply, which must be checked and corrected manually. In companies with several locations in different federal states, public holidays also differ regionally: What is a public holiday in Bavaria is not in Hamburg. This differentiation can hardly be maintained without errors manually.

A clearly defined handover process ensures that:

• All surcharges are taken into account in full
• No manual corrections are necessary
• Statements remain comprehensible

This is particularly relevant when there are several locations or different public holiday regulations.

Step 6: Communicate control internally

Clear internal communication prevents team uncertainty:

• How is Saturday work paid?
• Who does the regulation apply to?
• How are times recorded?
• Who can employees contact if they have any questions?

Transparency reduces inquiries and strengthens acceptance of the regulation.

Three scenarios from business practice

IT service provider with 60 employees: Saturday work is required regularly for updates, maintenance windows and emergency operations. Assignments have so far been recorded on a timesheet and sent manually to payroll at the end of the month. Errors occur particularly when a Saturday falls on a public holiday and the correct surcharge rate has to be checked manually. As a result, employees receive incorrect invoices and trust decreases.

Management consultancy with 25 consultants: Consultants give customer presentations or workshop days on Saturdays. The settlement is over Project time recording which is kept anyway for customer statements. However, the connection between Project Times on Saturdays and Payroll is not automated. Surcharges are updated manually, which means an additional effort of two to three hours per billing period.

Advertising agency with 15 employees: Pitch projects and deadlines are occasionally worked on Saturdays. There is no uniform regulation; management balances assignments ad hoc. A new employee asks about the regulation during onboarding. There is no written answer. The lack of transparency is a recruiting disadvantage.

Automatically insure surcharges for Saturday

The problems described share a common cause: lack of automation. Anyone who manages Saturday work, surcharge rates and payroll in separate systems creates media breaks. And media breaks generate errors.

In a time tracking solution that links the day of the week, working hours, and stored surcharge rules, the correct surcharge is calculated automatically. Saturday is identified as the relevant weekday, and the agreed surcharge rate is applied without manual input. If a Saturday falls on a public holiday, the corresponding holiday surcharge is used instead. The data is then transferred directly into payroll, eliminating the need for manual processing.

As soon as Saturday work starts regularly or several teams are involved, the complexity of billing increases noticeably. It becomes particularly critical when different systems for time tracking, project management and payroll accounting are used.

In these cases, it's worth choosing a solution that:

• Award rules managed centrally
• Automatically recognizes weekdays and holidays
• Project times linked directly to compensation logic
• Transfers data to payroll without manual intermediate steps

ZEP represents exactly this logic. In the module absences and overtime award rules can be defined in a differentiated manner: by day of the week, time and group of employees. Project times worked on Saturdays are automatically linked to the saved award parameter. The native DATEV and Lexware interface transfers the data directly to payroll, without an intermediate step.

This not only avoids calculation errors. It also prevents surcharges from being applied inconsistently because the rules are defined centrally once and then apply consistently to everyone. At the same time, documentation is created, which is reliable in the event of a dispute or during audits.

For employers who still rely on Excel lists or manual time sheets, a specific comparison is worthwhile: How many working hours go into manually checking and correcting supplement statements each month? What is the error rate and how much do corrections or employee complaints cost?

Conclusion

Working on Saturdays is part of everyday life in many project-based companies. Without clear regulations, ambiguities, additional coordination costs and avoidable billing risks arise over time.

Three measures quickly create structure:

Create transparency. Record how Saturday work is currently handled and where there are differences.

Define clear rules. Determine how Saturday work is paid and to whom the regulation applies.

Map processes cleanly. Connect time tracking, surcharge logic and payroll in one consistent system.

As soon as Saturday work starts regularly or several teams are affected, an automated solution pays off in particular. It reduces coordination costs, creates clarity within the team and ensures reliable billing.