2025 Income Tax Return Deadline June 1, 2026

The 2025 Income Tax Return Forms A and B can be accessed via the Tax Administration’s website (www.tax.sx) or through the online services portal at onlineservices.sintmaartengov.org. While forms may be downloaded online, submissions cannot be made online or via email and must be submitted physically to the Tax Administration.

Taxpayers are reminded to bring a copy of their completed tax return form for stamping as proof of receipt upon submission. Persons unable to file by the deadline may submit an extension request by Monday, June 1, 2026, accompanied by a valid reason. Income Tax extension requests must be submitted individually, as bulk or blanket requests for multiple taxpayers will not be accepted. Married couples are required to jointly submit one tax return form.

For more information or assistance, please contact the Tax Administration by telephone at 542-2143, 542-3782, 542-3839, or 542-3840, via WhatsApp at 556-3699, or by email at taxinfo@sintmaartengov.org.​