Single certification 2026: official models (cross-border guide)

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Italy has made available the Official Models of the Single Certification 2026, a key document for the declaration of income, including that received in Switzerland by border workers, who use the tax credit in the EC Framework of 730 to avoid double taxation.

Context

In brief - The Official 2026 Single Certification Models are available in Italy. - Border workers declare Swiss income in Italy, avoiding double taxation by means of a tax credit. - The New Frontier Agreement is in force from 1 January 2024. - Deductibles for frontier workers vary between €7,500 and €10,000. ## Key facts - What: Single Certification 2026, Official Models - When: Available models (for 2025 income) - Where: Italy, for the declaration of residents' income - Who: Relevant for Italian taxpayers, including border workers who declare Swiss income - Amount: Excess of €7,500 for old border workers, €10,000 for new border workers The Revenue Agency has made the Official Models of the Single Certification (CU) 2026 available, a crucial annual appointment for Italian taxpayers. Although the Single Certification is an Italian tax document, its availability and methods of compilation are also of interest to border workers who work in Canton Ticino and reside in Italy, as an integral part of the tax reporting process in their country of residence. Border workers, in fact, receive their income from work in Switzerland, where the source tax is applied. According to current regulations, this withholding takes place only in Switzerland. However, as tax residents in Italy, they are also required to declare their global income

Operational details

For cross-border workers, the importance of the Unique Certification 2026 is part of the broader framework of income tax declaration in Italy. Although employment income is taxed at source in Switzerland, the cross-border worker resident in Italy is required to declare such income in the 730 Form. The declaration process is crucial to benefit from the tax credit mechanism, which serves to compensate for taxes already paid in Switzerland and to avoid that the same income is taxed twice. The CE Section of the 730 Form is the specific section dedicated to foreign-earned income and taxes paid, where the credit is calculated. This credit is essential to reduce or eliminate Italian income tax on Swiss income, in line with the 1976 Convention and the new Cross-Border Workers Agreement of 2020.

Useful tools for your case

To verify your within/over 20 km tax scenario, use the net salary calculator and the tax return guide.

Key points

The availability of the Official Models of the Unique Certification 2026 implies that cross-border workers must prepare for their annual income tax declaration in Italy, which generally takes place in the spring-summer period. The first step for a cross-border worker is to ensure they have all the necessary documentation related to the income earned and the tax withheld in Switzerland. Although the Swiss employer does not issue an Italian Unique Certification, cross-border workers will have to use the Swiss tax documentation (such as the salary certificate) to correctly fill out the 730 Model in Italy, particularly the CE Framework. This framework is dedicated to the management of income produced abroad and the related tax credit to avoid double taxation, a principle sanctioned by the Italy-Switzerland Convention of 1976 and the more recent Cross-Border Workers Agreement of 2020.

Procedure and Essential Documents For the correct compilation of the 730 Model, cross-border workers will have to: 1) collect all documents that attest to the gross income and the source tax paid in Switzerland; 2) identify their category (old or new cross-border worker) to apply the correct exemption allowance (€7,500 or €10,000); 3) fill out the CE Framework of the 730 Model, inserting the Swiss income data and calculating the tax credit due. It is essential to pay attention to the instructions of the Revenue Agency and, if necessary, consult a tax professional to avoid errors that could lead to sanctions or non-optimal taxation. Law 83 of 13/6/2023, which ratified the New Cross-Border Workers Agreement, has made the rules and definitions even more stringent, making an in-depth knowledge of one's specific working and residential conditions indispensable.

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Frequently Asked Questions
What is the 2026 Single Certification and how does it affect border workers?
The Single Certification 2026 is an Italian tax document that certifies the income received. For frontier workers, although not issued by the Swiss employer, it is relevant because Swiss income must be declared in Italy in Form 730. The CU provides the context for the Italian tax return, where frontier workers use the EC Framework to claim the tax credit and deductibles.
How do you avoid double taxation for Swiss income?
Double taxation is avoided thanks to the tax credit, which border workers require by filling in the CE Framework of the Italian Model 730. This mechanism is provided for by the Italy-Switzerland Convention of 9 DECEMBER 1976 and the New Frontier Agreement, in force since 1 JANUARY 2024, which establish the rules for the taxation of cross-border labour income.
What are the tax exemptions for frontier workers in 2026?
For 'old frontier workers' (those already active before 17/7/2023), the exemption exemption is €7,500, applicable until 2033. For 'new frontier workers' (hired after 17/7/2023), the deductible is €10,000. These deductibles reduce the taxable income in Italy after the application of the tax credit.
What documents are needed for the Italian tax return for a border worker?
For the Italian tax return (Form 730), a frontier worker must obtain the documentation relating to gross income and withholding tax withheld in Switzerland. It is not an Italian Single Certification, but an equivalent document issued by the Swiss employer, such as the salary certificate, certifying the data necessary for the compilation of the CE Framework.

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