From Como to Chiasso by train takes eight minutes. From Varese to Mendrisio by car is just under half an hour. Hardly any other Swiss canton has a border as permeable as Ticino — around 80,000 people commute daily from Lombardy and Piedmont across the border to work. The fact that part of sex work in the canton functions in the same way is not surprising, but geography.
The legal framework, however, does not follow this geography. Anyone who wants to work legally in Ticino but lives in Italy moves simultaneously within three legal systems: the freedom of movement agreement between Switzerland and the EU, the cantonal prostitution law, and Italian criminal law. These three legal systems do not recognize each other. They have different deadlines, different authorities, and different understandings of what a workplace is. This is exactly where the errors arise that regularly lead to charges in Ticino — and almost never because someone deliberately ignored the rules.
This text organizes the levels for sex work in Ticino: authorization, reporting requirements, and responsibilities from the perspective of those who drive back across the border in the evening.
Three Legal Systems at a Border
In Italy, sex work itself is not a criminal offense. What is criminal is what third parties do around it: the Legge Merlin (Law No. 75 of February 20, 1958) closed state-regulated brothels and instead introduced offenses of exploitation and promotion of prostitution. The Italian Court of Cassation subsequently clarified that the mere rental of an apartment at market price for residential purposes does not constitute promotion — it becomes problematic as soon as unjustified profit is drawn from the rental. The result is a country without legal infrastructure: no licensed establishments, no registration or reporting office, no recognized professional status.
Ticino does the opposite. The Legge sull’esercizio della prostituzione (LProst, RS/TI 550.500) of January 22, 2018, has been in force since July 1, 2019, and replaced the 2001 law; there is also the Regolamento RProst (550.510). The canton does not ban sex work; it channels it: into licensed locali erotici or into apartments that are registered — and it ties both to personal registration with the police.
This creates the basic constellation of this border region: On the Italian side, there is no legal workplace; on the Ticino side, there is one, but only with documentation. Those who have the papers work north of the border and sleep south of it. The detailed foundation for this is in our overview of the canton with its own prostitution law.
The Immigration Entry Ticket
Before TESEU registration is even possible, an immigration title is needed. The cantonal police accept registration from persons with Swiss citizenship, from foreigners with valid permits — or from persons who can provide confirmation of the registration procedure for short-term employment. For commuters from EU countries, there are therefore practically two paths.
Path One: the 90-Day Registration Procedure
The freedom of movement agreement liberalizes cross-border services by self-employed persons from the EU/EFTA area for a maximum of 90 actual working days per calendar year. Anything beyond that is subject to authorization, no longer just registration. Actual working days are counted, distributed throughout the year — not consecutive calendar months.
Two details are crucial for the erotic services industry:
- The general rule that registration is only required from the ninth working day in the calendar year does not apply here. For the erotic services industry, registration is required from the first working day — one of the few industries with this special rule.
- Self-employed service providers must generally submit the registration at least eight days before the start of work. Since March 2025, it has been exclusively online via the federal portal EasyGov.swiss, and the specific working days must be indicated there.
So if someone thinks that a spontaneous „I’ll just drive over tomorrow“ satisfies the rules, they are off on timing before anyone even checks the workplace. In Ticino, the Ufficio per la sorveglianza del mercato del lavoro (USML) is responsible for registering short-term employment.
Path Two: the Cross-Border Resident Permit G
Anyone who wants to work more than 90 days per year in the canton needs a permit. For EU/EFTA citizens with residence in a neighboring state, this is usually the cross-border resident permit G, issued by the Sezione della popolazione (SPOP). It is explicitly also issued to self-employed persons — however, the self-employment must already be documented when the application is submitted, for example with accounting records, a commercial register entry, or a lease for business premises. Those who credibly demonstrate that the activity is sustainable receive a permit with five-year validity. The requirement remains weekly return to the foreign residence; if the residence is moved to Switzerland, G status is lost.
This is the point where many paths end before they begin: self-employment must be documentable. Invoices, contracts, a lease — precisely the documents that are typically missing in an informally organized environment.
The TESEU Counter: What the Registration Is and What It Isn’t
The registration itself is received by the Sezione TESEU of the Polizia cantonale, located in the Dipartimento delle istituzioni. It is the service responsible in the canton for human trafficking, promotion of prostitution, and immigration violations — the registration office is thus also an investigation office. This dual role noticeably shapes the experience at the counter, which we described in more detail in the text about the path next to the police counter.
Procedure: personal appearance, ID check, signature on the form, then an individual TESEU number. For foreigners, proof of residence permit or confirmation of the employment registration is additionally required. At the moment of registration, there is an entitlement to free medical consultation. We have itemized the fees and the question of what exactly is being paid for in the cost breakdown around the TESEU number.
Important for commuters: The TESEU number is not a work permit. It neither replaces the registration procedure nor the permit G, but requires one of these titles. And it covers only Ticino — if you work in Zurich or Bern the following week, you are subject to a different cantonal order there.
Where 90 Days Meet Three Months
The most delicate part is the workplace. According to LProst, work is permitted in a licensed locale erotico — or in an apartment that is owned or for which usage rights exist, where work must be conducted individually. The regulation specifies: one person per apartment, one apartment per building, and a lease or sublease with a duration of at least three months. The registration of the apartment is not done by the sex worker, but by whoever provides the apartment; TESEU subsequently informs the municipality and the owners.
This is where the friction arises that gives this article its title. Immigration law thinks in working days — 90 per calendar year, freely distributed throughout the year. Cantonal prostitution law thinks in contract duration — at least three months of lease, regardless of how many days someone is actually present. Both can be reconciled, but not with the model most prevalent in practice: the short-term apartment booked by day or week. This model is precisely not permitted in Ticino, regardless of how cleanly registration and taxes are otherwise handled.
The numbers show how consistently this is monitored. Violations for unauthorized sex work rose from 50 (2022) to 59 (2023) to 149 (2024). In 2024, 128 people were reported to the public prosecutor, about 80 of them in connection with short-term rented apartments. In summer 2025, all nine licensed locali erotici in the Ticino portion of the international GLOBAL CHAIN operation were inspected — without findings; the 15 charges concerned controlled apartments and a public establishment. We elaborated on this asymmetry between licensed establishments and apartments in the text about the nine establishments and fourteen inspected apartments.
Then there is the municipal level. Article 3 LProst prohibits street prostitution and publicly visible solicitation, as well as proximity to schools, hospitals, retirement and nursing homes, recognized places of worship, cemeteries, public transport stops, public buildings, and playgrounds; also zones that the land-use plan mainly dedicates to residential use. Municipalities may go further by ordinance — and do so very differently. Chiasso restricts sex work to a single zone, Mendrisio works with distance radii. For commuters, this means: the address matters, and it matters per municipality, not uniformly across the canton. Which municipality has chosen which approach is in our municipal map for the canton. The current ordinance of the relevant municipality is always binding.
Money: the Daily Tax Account and What Comes After
Since the LProst came into force, Ticino has charged a tax account of CHF 25 per working day. In the licensed establishment, management collects the amount and passes it on; those working in a registered apartment pay themselves — the person providing the apartment may not deduct the amount. The technical implementation is regulated by the Divisione delle contribuzioni in Circular No. 30 of July 1, 2019, with Form 3P for recording and Form 4P as proof for the tax period.
Two things about this are regularly misunderstood.
First, the amount is an account, not a flat-rate tax. It is a prepayment on the tax base, not the final settlement of tax liability. What is ultimately owed is determined by the assessment — and how this settlement actually occurs for persons without residence in Switzerland is precisely the question you should ask the Divisione delle contribuzioni about, rather than guessing. Form 4P is the receipt you keep.Second, the cross-border commuter agreement does not apply here automatically. The agreement between Switzerland and Italy on the taxation of cross-border workers entered into force on July 17, 2023, and has been applied since January 1, 2024; it regulates source taxation in the country of employment and the offsetting in the country of residence. However, it applies only to dependent employment. Anyone working self-employed in Ticino — which is the norm in sex work — does not fall under this regime, but under the general rules of the double taxation agreement for self-employed activities. Whether a declaration obligation exists in Italy and how any potential double taxation is avoided is a question for Italian tax advice, not for the Swiss authority.
To put the scale in perspective: According to the Divisione delle contribuzioni, the advance payment brought the canton CHF 740,000 (2020), CHF 700,000 (2021), and provisionally around CHF 1.1 million (2022). Newer fully published annual figures are not publicly available.
AHV, Status, and Health Insurance
Anyone working self-employed in Ticino registers with the compensation fund of the canton in which the activity is carried out — in Ticino the Cassa cantonale di compensazione at the Istituto delle assicurazioni sociali (IAS). The fund does not recognize self-employed status on request alone, but based on documentation: invoices issued, contracts with clients, rental agreements, business records. For commuters, this is doubly relevant because the same documents are also required for the G permit.
Under social insurance law within EU coordination, the principle is that the legal system of the state in which the economic activity is carried out is responsible. Anyone working exclusively in Ticino and living in Italy is therefore subject to the Swiss system — anyone also working in Italy should clarify the assignment in advance, because the rules work differently for activities in multiple states.
For health insurance, there is a so-called right of option for persons residing in Italy, France, Germany, or Austria: one can, within three months, have oneself released from the Swiss insurance obligation and remain insured in the country of residence. The Federal Court clarified in 2015 that a tacit exercise of the right of option is not sufficient — a formal application with the responsible cantonal office is required. The choice is generally one-time and only possible again if circumstances change. Anyone who lets the deadline pass without acting does not automatically end up where they assume.
Inspection, Fines — and a Detail for Residence Abroad
Art. 27 LProst provides for fines of CHF 200 to CHF 40,000, enforced by the department under the Violations Procedure Act. One point directly affects commuters: if you reside abroad, a cost advance or security deposit may be required. A violation is thus not only more expensive in the outcome for someone with an address in Italy, but potentially also becomes due earlier than for someone residing in the canton.
For establishments, Art. 25 LProst also applies, which provides for revocation of the permit, among other things, for false statements, serious or repeated violations, and for non-payment of social contributions and taxes. This is also relevant for sex workers: if a premises closes, the legal workplace disappears — and the apartment you resort to is again subject to stricter rules.
Advice Not from the Police
The registration office is a police office. For questions you don’t want to ask there, there is a separate structure in the canton: Primis („prevenzione, informazione e mediazione nell’industria del sesso“), a service of Zonaprotetta, was appointed by the State Council in 2006 to provide health, social, and legal advice to sex workers. The contact point is located at Via Bagutti 2 in Lugano; on Wednesday afternoons there is an opportunity for conversation without prior registration. In addition, the Consultori di salute sessuale of the EOC operate locations in Bellinzona, Locarno, Lugano, and Mendrisio. There is also the right to free medical consultation at the time of registration.
What Should Be Clarified Before the First Trip
- Foreigners law document: Registration procedure via EasyGov (erotic business: from the first working day, generally eight days in advance, maximum 90 effective working days per calendar year) or G permit from SPOP.
- TESEU registration: in person, with ID and proof of title; only after this is the TESEU number valid.
- Workplace: licensed erotic premises or registered apartment with at least a three-month contract, one person per apartment; registration by the person providing the apartment.
- Municipality: Check the Ordinanza of the specific municipality — zones and distances vary considerably.
- Taxes: Advance payment of CHF 25 per working day, keep Modulo 4P; clarify settlement and declaration obligation for residence abroad with the Divisione delle contribuzioni and Italian tax advice.
- Social insurance: Registration with the Cassa cantonale di compensazione (IAS) with documentation of self-employed status; formally exercise the right of option for health insurance within three months.
Responsible Authorities
Polizia cantonale, Sezione TESEU (registration, apartment registration, TESEU number); Servizio autorizzazioni of the Polizia cantonale (permit for erotic premises); Ufficio per la sorveglianza del mercato del lavoro USML (registration procedure short-term employment); Sezione della popolazione SPOP (G permit); Istituto delle assicurazioni sociali IAS (AHV/IV/EO, self-employed status); Divisione delle contribuzioni (advance payment, assessment); the respective municipality (Ordinanza, construction and zoning law).
This article summarizes the publicly documented status journalistically and does not replace legal or tax advice. Rules, deadlines, and fees change; only the information from the responsible cantonal office or the residential or employment municipality is binding. Anyone working across the border should also clarify the Italian side with a specialist on site — the Swiss authority cannot provide binding information on this.