Tillaeg Explained: Wage Supplements for EU Workers in 2026

When a Polish carpenter or scaffolder steps onto a Danish construction site, the base hourly rate is only the starting point. Danish collective agreements layer a set of mandatory wage supplements, known as tillaeg, on top of the base wage, and every employer operating in Denmark is legally obliged to pay them regardless of whether the worker was recruited locally or posted from abroad. Understanding which tillaeg apply, how to document them, and what happens when they are missing is one of the most practical compliance challenges facing site managers and HR teams in 2026.

What Are Tillaeg and Why Do They Apply to Foreign Workers?

Tillaeg is the Danish term for wage supplements or allowances added to a worker's base pay to compensate for specific conditions: unsocial hours, dirty or hazardous work, travel, tools, and more. Under the Posted Workers Directive, transposed into Danish law, workers posted to Denmark must receive at least the same pay and conditions as local workers covered by the relevant collective agreement. The construction sector is primarily governed by the agreement between Dansk Byggeri and the trade union 3F. That agreement sets not only the minimum hourly rate but also the rates and conditions for each category of tillaeg.

This obligation is not optional. Workindenmark.dk confirms that posted workers are entitled to the same core working conditions as Danish employees, including all pay elements defined in the applicable collective agreement. For employers, this means that running a separate, simplified pay structure for Polish or other EU workers, and omitting tillaeg, creates direct legal and financial exposure.

The Main Categories of Tillaeg on a Danish Construction Site

Overtime and Unsocial Hours Supplements

Work performed outside normal weekday hours attracts overtime or unsocial-hours supplements. The specific rates are defined in the Dansk Byggeri-3F collective agreement; employers should consult the current agreement text directly via Dansk Byggeri's overenskomst page to confirm the applicable multipliers, as rates are renegotiated periodically. Failure to pay the correct rate for evening, night, or weekend work is one of the most common findings in Arbejdstilsynet inspections.

Dirty-Work and Hazardous-Conditions Supplements

Tasks classified as particularly dirty, dusty, or physically demanding, demolition, working with certain insulation materials, confined-space work, typically trigger a dirty-work supplement (smudstilaeg or genetilaeg). The classification of which tasks qualify is set out in the collective agreement. Site managers should map task categories to the agreement's list before the project begins, not after a complaint is filed.

Travel and Transport Allowances

If workers travel from a base location to a remote site, travel-time pay and transport allowances may be due. For posted workers who are accommodated by the employer, the rules on deductions from wages for accommodation are strictly regulated: Workindenmark.dk notes that any deductions must be transparent, agreed in writing, and must not reduce net pay below the minimum rate. Employers who deduct accommodation costs without a written agreement risk having those deductions treated as unlawful wage reductions.

Tool and Equipment Allowances

Certain agreements provide a tool allowance for workers who supply their own hand tools. Again, the applicable rate is in the collective agreement text. Many smaller Polish subcontractors operating in Denmark are unaware that this allowance exists and therefore never include it in payroll calculations.

Holiday Pay: A Supplement That Requires Its Own System

Holiday pay in Denmark operates differently from most EU countries and deserves separate attention. Contributions are made to FerieKonto, and the obligation applies to posted workers too. Getting this wrong has a compounding effect: underpaid holiday pay means underpaid tillaeg on top of the base wage, doubling the liability. For a detailed breakdown of how to calculate holiday pay correctly for workers on short rotations, see our guide on Calculating Holiday Pay for Short-Rotation Workers: 2026 Guide.

Documentation: What Employers Must Be Able to Show

Arbejdstilsynet and 3F both have the right to inspect payroll records on Danish construction sites. Employers must be able to demonstrate, for each worker and each pay period, which tillaeg categories were applied and on what basis. A single line in a payslip reading "supplement" without a category reference is not sufficient. The documentation requirements under Arbejdstilsynet's working-time rules mean that time records must show the actual start and end times of each shift, not just totals.

Paper timesheets have historically been the norm on many sites with rotating EU crews, but they create serious risks when a worker disputes their hours or a supplement claim is made retrospectively. The practical advantages of digital systems are explored in depth in our article on Digital Time Tracking vs Paper: Protecting Agencies in Denmark 2026.

The Risk of Getting It Wrong

Non-compliance with tillaeg obligations exposes employers to several overlapping risks. Arbejdstilsynet can issue improvement notices and, in serious cases, stop-work orders under Arbejdsmiljøloven. 3F can pursue collective action or bring claims on behalf of members. Posted workers can also file complaints with the Polish labour inspectorate, PIP (Panstwowa Inspekcja Pracy), which cooperates with Arbejdstilsynet under EU enforcement frameworks. SKAT may also scrutinise payroll records if a tax inspection is triggered, since incorrectly classified payments can affect the employer's withholding obligations under Danish tax rules described on SKAT's pages for employers with foreign staff.

The labour market context adds urgency. With an ageing domestic workforce and continued reliance on Polish and other EU crews to fill skilled roles, the reputational cost of a publicised wage dispute can affect recruitment for years. For context on how workforce demographics are reshaping site staffing, see Ageing Workforce and PL-DK Site Turnover: Filling the Gap in 2026.

Practical Next Steps for Employers

1. Obtain the current collective agreement text. Download the latest Dansk Byggeri-3F agreement from Dansk Byggeri's overenskomst page and identify every tillaeg category relevant to your site activities.
2. Map your task types to agreement categories. Before a project starts, list every task category workers will perform and match each to the relevant supplement. Involve your site manager, not just payroll.
3. Update payslip templates. Each tillaeg must appear as a named, separate line item on the payslip. Generic "supplement" lines will not satisfy an inspection.
4. Audit your holiday-pay contributions. Verify that contributions to FerieKonto are calculated on the full pensionable pay including tillaeg, not just the base rate.
5. Switch to digital time recording. Ensure your system captures shift start, end, and break times in a format that can be exported for inspection.
6. Brief your Polish crew leaders. Workers who understand what supplements they are entitled to are less likely to escalate disputes to 3F or PIP. Transparency reduces risk.
7. Review subcontractor contracts. If you use Polish subcontractors, your contract should require them to comply with Danish collective agreement conditions and to provide payroll evidence on request. Joint and several liability for wage claims is a real exposure in the Danish market.