grenzgaenger-schweiz-besteuerung-deutschland

Germany–Switzerland · Article 15a of the Tax Treaty

Working in Switzerland, Living in Germany: Frontier-Worker Taxation

If you live in Germany and work in Switzerland, you may qualify for the frontier-worker rules in Article 15a of the Germany–Switzerland double taxation agreement. Germany, as your country of residence, then generally taxes your employment income. With proof of German tax residence, Switzerland may levy withholding tax of no more than 4.5% of gross remuneration. From 2026, two conditions in particular must be assessed separately: regular return home, generally requiring commuting on at least 20% of the agreed working days, and compliance with the individual limit on work-related non-return days.

Updated: 3 November 2026 · Rules applicable from 2026

Article 15a of the Germany–Switzerland Tax Treaty

Frontier workers are covered by a special rule for employment income

Under the general employment income rule in Article 15, the country where the work is physically performed may generally have a right to tax that income. The treaty’s other conditions and exceptions must also be considered. An employee resident in Germany who works in Switzerland may therefore generally need to allocate employment income between the countries.

However, Article 15a of the Germany–Switzerland tax treaty contains a special frontier-worker rule. If an employee meets its conditions, the primary right to tax their employment income generally remains with the country of residence.

For a frontier worker resident in Germany, this means that Germany generally taxes the employment income. Switzerland, as the country of work, may levy only a limited withholding tax.

Eligibility

Who qualifies as a frontier worker under the tax treaty?

A frontier worker is generally a person who is resident in one contracting state, has their workplace in the other contracting state and regularly returns home from that workplace. Regular return home and compliance with the non-return-day limit are separate requirements.

DE

Residence in Germany

In the situation considered here, the individual must generally be resident in Germany for tax treaty purposes. If they have homes in both countries, treaty residence must be determined separately under Article 4.

CH

Employment in Switzerland

The relevant workplace must be in Switzerland. Having a Swiss employer alone is not sufficient. The employment contract, integration into the employer’s business and actual working arrangement must be reviewed.

↔

Regular return home

From 2026, actual journeys from home to the Swiss workplace and back are generally required on at least 20% of the working days agreed under the employment contract for the calendar year. Non-return days must also be assessed separately.

Regular Return Home from 2026

At least 20% of the agreed working days must involve commuting to work and back

Paragraph 5(b) of the Protocol concerning Article 15a(2) defines regular return home more precisely. Under their employment contract or contracts, the employee must generally travel from home to the workplace and back on at least 20% of the agreed working days in the calendar year.

Actual outward and return journeys are decisive. Days spent at the Swiss office without the corresponding return home and full days worked from home in Germany do not count as these commuting days. The percentage is based on working days, not working hours.

20%

Regular return home

The minimum commuting percentage must be assessed independently of the number of work-related non-return days. An employee can fail to qualify as a frontier worker even without a single non-return day.

60

Non-return-day limit

The limit applicable to the individual must also not be exceeded. It is generally 60 days for full-time employment throughout the year and may be lower for employment covering only part of the year or part-time work involving fewer working days.

For work patterns that extend over several days for operational reasons, such as shift work or on-call duties, the special provisions in paragraph 5(c) of the Protocol must be considered. The amending protocol entered into force on 27 November 2025; the 20% rule described here applies from 1 January 2026. Earlier tax years must be assessed under the rules applicable at that time.

Non-Return Days

The applicable non-return-day limit must also be met

Failing to return home after work on an individual day does not immediately cause an employee to lose frontier-worker status.

For full-time employment throughout the year, up to 60 work-related non-return days are generally permitted. If the applicable limit is exceeded, frontier-worker status is generally lost for the relevant tax year. Regular return home and the other eligibility conditions must be met independently of this limit.

  • Generally, up to 60 non-return days are permitted for full-time employment throughout the year
  • Where the limit is 60 days, the 61st relevant day generally results in the loss of status
  • The failure to return home must be work-related
  • The limit is reduced for employment covering only part of the year
  • Part-time work involving fewer working days reduces the limit proportionately; working from home alone does not
  • Consider the Gre-3 employer’s certificate and endorsement by the competent tax authority

What Counts as a Non-Return Day?

Not every overnight stay in Switzerland automatically counts towards the limit

The 60-day rule primarily concerns working days on which an employee does not return to their German home after work for work-related reasons.

Simply spending a night away from the German home is therefore not sufficient in every situation. The actual reasons for not returning are decisive.

An important special rule applies from 2026 to one-day business trips to third countries: these count as non-return days even if the employee actually returns home. One-day business trips within Germany or Switzerland do not count as non-return days. For shift work and on-call duties, work extending over several calendar days is not treated as a non-return merely because the calendar date changes.

Employment for Part of the Year

The 60-day limit is reduced if employment does not cover the full year

The full allowance of 60 non-return days generally applies to full-time employment throughout the year. If the employee is not employed in the other contracting state for the entire calendar year, the limit is adjusted for the employment period.

Under paragraph 5(g) of the Protocol, the allowance is five non-return days for each full month of employment and one day for each additional full week of employment that has not already been included in a full month.

For part-time work involving fewer working days, paragraph 5(i) of the Protocol requires a proportionate reduction. The relevant ratio is the number of agreed working days compared with the employer’s normal number of working days for full-time employment. Simply reducing daily working hours or working from home without changing the number of agreed working days does not trigger this part-time reduction.

12M

Full-year employment

For full-time employment throughout the year, up to 60 work-related non-return days are generally permitted. The regular-return requirement must also be met.

6M

Starting during the year

If employment starts during the year, for example, the permitted number of non-return days must be calculated proportionately for the relevant period.

PT

Part-time work

Where part-time work involves fewer working days, the limit is reduced in proportion to agreed working days compared with normal full-time working days. A full-time position with three Swiss office days and two days worked from home in Germany is not part-time work involving fewer working days.

Tax Consequences

Germany taxes the employment income; Switzerland may levy limited withholding tax

Aspect Frontier worker resident in Germany Consequence
Country of residence Germany Germany generally taxes the employment income under its income tax rules.
Country of work Switzerland With proof of German tax residence, Switzerland may generally levy withholding tax of no more than 4.5% of gross remuneration.
Double taxation relief German tax assessment Swiss withholding tax permitted under Article 15a and actually levied is credited against German income tax.
Reporting Germany The Swiss employment income generally has to be reported in the German income tax return.

Swiss Withholding Tax

Swiss withholding tax for frontier workers is generally capped at 4.5%

Article 15a permits the country of work to levy a limited tax on employment income. For a frontier worker resident in Germany, Switzerland may generally withhold no more than 4.5% of gross remuneration.

Applying the reduced withholding tax rate requires, in particular, proof of German tax residence to be provided to the Swiss employer or the competent Swiss authorities.

Swiss withholding tax does not replace German income tax. The employment income is generally declared in Germany, and the creditable Swiss tax is taken into account in calculating the German tax liability.

Certificate of Residence

The reduced Swiss withholding tax rate requires formal documentation

To cap Swiss withholding tax at 4.5%, German tax residence must be evidenced by an official certificate, normally the Gre-1 form certified by the German tax office or the Gre-2 renewal certificate. The substantive conditions for frontier-worker status must also be met.

Without the required certificate, Swiss withholding tax may be higher. Excess Swiss withholding tax cannot simply be credited without limit against German income tax.

Frontier-worker status should therefore be supported by both the underlying facts and the required documentation from the start of employment.

German Income Tax

Swiss employment income generally belongs in the German tax return

A frontier worker resident in Germany is generally subject to German income tax on their worldwide income. This includes remuneration from their Swiss employment.

German tax is calculated under German rules. At the same time, Swiss withholding tax permitted under Article 15a must be taken into account.

  • Record gross Swiss employment income
  • Review the Swiss salary certificate
  • Document withholding tax
  • Convert the amounts into euros
  • Review deductible employment expenses under German rules
  • Include other German and foreign income

Employment Expenses

The German tax return generally follows German deduction rules

Because the frontier worker is tax resident in Germany and their employment income is generally taxable there, the German rules on employment-related expenses must also be considered.

Depending on the circumstances, deductible expenses may include commuting costs, work equipment, professional training, business travel and other employment-related costs.

Swiss tax deductions cannot simply be carried over unchanged into the German income tax return. Their treatment under German tax law is decisive.

Exchange Rates

Swiss francs must be converted into euros for the German tax return

Swiss employment income, withholding tax and deductible expenses are usually denominated in Swiss francs. The relevant amounts must be converted into euros for the German income tax return.

A consistent and verifiable conversion method should be used. For recurring monthly salary payments, the timing of the payments may be relevant to the conversion.

Careful preparation of the CHF amounts can have a noticeable effect on the German tax base, particularly when exchange rates fluctuate significantly.

Loss of Frontier-Worker Status

Failing to meet a frontier-worker condition changes the tax treatment

Article 15a generally does not apply if the regular-return requirement is not met or the applicable non-return-day limit is exceeded. In particular, a very high proportion of home working can cause the employee to fail the 20% requirement, even without any work-related non-return days.

The general employment income rules in Article 15 then generally apply, subject to any relevant special provisions. The actual places of work and working days become essential for allocating employment income. Losing frontier-worker status does not automatically make the entire salary taxable exclusively in Switzerland.

The tax outcome may therefore differ substantially from frontier-worker treatment. Both the commuting percentage and non-return days should be monitored during the year. Swiss withholding tax deductions must also reflect the correct classification.

15a

A frontier-worker condition is not met

Failing to return home regularly and exceeding the individual non-return-day limit are separate reasons why Article 15a may not apply.

15

General employment income rule

Article 15 of the treaty must then be considered, in particular, instead of Article 15a when determining the taxation of employment income.

DAY

Workdays become decisive

Work performed in Switzerland, Germany and any third countries must be allocated correctly for tax purposes.

Working from Home

Days worked from home in Germany require separate consideration

When an employee resident in Germany works partly from their German home, the work is physically performed in Germany on those days.

Full days worked at home do not count as work-related non-return days. However, they are also not commuting days for the 20% test. A high proportion of home working can therefore cause the employee to fail the regular-return requirement even if the non-return-day limit is met.

If Article 15a continues to apply, German home-working days alone do not cause employment income to be allocated under the general place-of-work rules. If frontier-worker status does not apply, Article 15 and the actual allocation of working days generally need to be reviewed. Tax and social security follow different rules and must be assessed separately.

Social Security

Tax status as a frontier worker and social security coverage are separate matters

The frontier-worker provisions in Article 15a govern the taxation of employment income. They do not automatically determine which social security system covers an employee.

Separate social security coordination rules apply to employees working across the German–Swiss border. Regular work in multiple countries or working from home in the country of residence may be particularly relevant.

Before making a permanent change to a working arrangement, social security should therefore be reviewed alongside income tax.

Typical Situations

Frontier-worker scenarios at a glance

Situation Frontier-worker treatment Key points to review
Living in Germany, working in Switzerland, returning home daily Article 15a may generally apply Certificate of residence and Swiss withholding tax
Up to 60 work-related non-return days Generally permitted for full-time employment throughout the year The 20% requirement and other conditions must also be met
The individual non-return-day limit is exceeded Frontier-worker status is generally lost Article 15, special provisions and allocation by workdays
Commuting on fewer than 20% of working days while working mainly from home The regular-return requirement is generally not met Review Article 15 even if there are no work-related non-return days
Employment starting during the year Reduced non-return-day limit Months and full weeks of employment
Regular work from home in Germany A full day at home is neither a non-return day nor a commuting day The 20% test, work locations and social security
Homes in both Germany and Switzerland Status is not automatically established Tax treaty residence under Article 4

Practical Approach

A structured review of frontier-worker taxation

Establish tax treaty residence

First determine whether the employee is actually resident in Germany for tax treaty purposes.

Document work locations and the working arrangement

Keep clear records of the Swiss workplace, days worked from home in Germany, business travel and other work locations.

Review the pattern of returning home

Compare actual outward and return journeys with the contractually agreed working days. From 2026, a minimum commuting percentage of 20% generally applies. Special provisions, such as those for shift work, must also be considered.

Count non-return days

Work-related non-return days must be recorded on an ongoing basis and compared with the limit applicable to the individual.

Review withholding tax

Check the Swiss withholding tax deductions and the required certificate of residence.

Prepare the German tax return

Employment income, Swiss withholding tax, deductible employment expenses and other income are included in the assessment under German rules.

Assess social security separately

The applicable social security system must be determined independently, particularly where the employee works from home or in multiple countries.

Further Reading

Related topics

Tax treaty residence: Germany–Switzerland

Permanent home, centre of vital interests and tie-breaker rules where an individual has homes in both countries.

German tax returns for employees

Employment income, deductible expenses, working from home and foreign income in the German tax return.

German income while living in Switzerland

Limited tax liability, employment income, property, pensions and other German income.

Germany–Switzerland tax advice

Cross-border tax advice for employees, private individuals, business owners and companies.

Frequently Asked Questions

Frontier workers between Germany and Switzerland

What does the 20% rule mean from 2026?
To meet the regular-return requirement, actual journeys from home to the workplace and back are generally required on at least 20% of the contractually agreed working days in the calendar year. The applicable non-return-day limit must also be met.
Can frontier-worker status fail even without any non-return days?
Yes. Working almost exclusively from home in Germany can cause the employee to fail the 20% requirement even without a single work-related non-return day. The two requirements must be assessed separately.
Where does a frontier worker who lives in Germany and works in Switzerland pay income tax?
If the employee meets the conditions of Article 15a of the Germany–Switzerland tax treaty, their employment income is generally taxed in Germany as the country of residence. Switzerland, as the country of work, may generally levy withholding tax of no more than 4.5% of gross remuneration.
What does the 60-day rule mean for frontier workers?
For full-time employment throughout the year, up to 60 work-related non-return days are generally permitted. Exceeding the applicable limit generally causes frontier-worker status to be lost for the relevant tax year. Regular return home and the other conditions must also be met. A lower limit may apply to employment covering only part of the year or part-time work involving fewer working days.
Does every overnight stay in Switzerland count as a non-return day?
No. For frontier-worker treatment, it matters in particular whether the failure to return home is caused by the employee’s work. Private overnight stays must therefore be distinguished from work-related non-return days.
Does the 60-day limit also apply if employment starts during the year?
No. If employment does not cover the full year, the permitted number of non-return days is reduced. The allowance is generally five days for each full month of employment and one day for each additional full week of employment not already included in a full month.
Is the 4.5% Swiss withholding tax the total income tax payable?
No. The 4.5% generally represents only the Swiss withholding tax permitted under Article 15a. A frontier worker resident in Germany must generally also report the employment income in their German income tax assessment.
Is Swiss withholding tax taken into account in Germany?
Yes. Swiss withholding tax permitted under Article 15a and actually levied is credited against German income tax. Excess Swiss tax deductions are not automatically creditable in full. A correction or refund may need to be requested through the Swiss tax procedure.
What happens if there are more than 60 non-return days?
If the individual limit is 60 days, exceeding it generally causes frontier-worker status to be lost. Where a lower limit applies, this can happen earlier. Article 15, relevant special provisions and actual work locations must then be reviewed.
Does a frontier worker have to file a German tax return?
Swiss employment income must generally be included in the German income tax assessment of a frontier worker resident in Germany. The specific filing obligation depends on the overall circumstances, but a German tax assessment is normally required in typical frontier-worker cases.
What applies when working from home in Germany?
A full day worked at home in Germany is not a work-related non-return day, but it is also not a commuting day for the 20% test. If Article 15a continues to apply, German home-working days alone do not cause employment income to be allocated between countries of work. Social security must be assessed independently.
Is the frontier-worker rule the same as the 183-day rule?
No. Article 15a contains a special frontier-worker rule. The 20% requirement concerns regular return home, while the 60-day rule concerns work-related non-return days. The 183-day rule is part of Article 15(2) and requires further conditions to be met in addition to the length of the stay.

Legal Basis

Official sources and further information

Germany–Switzerland Tax Advice

Do you live in Germany and work in Switzerland?

We assess frontier-worker status under Article 15a, including the 20% requirement, the individual non-return-day limit and your home-working arrangement. We review how Swiss withholding tax, German income tax and workdays in both countries interact and coordinate the tax treatment between Germany and Switzerland.

Arrange an initial consultation