What you need
- A marriage registered at a Thai district office (amphur), or a foreign marriage registered in Thailand. The certificate is called Kor Ror 2 or 3 (and Kor Ror 22 for foreign marriages).
- 400,000 THB in a Thai bank account in your name for at least 2 months, or 40,000 THB a month in income.
- Your spouse's ID card and house registration book (tabien baan).
- Photos of you together at home, and sometimes a simple map.
The yearly extension
- Apply at your immigration office with your spouse. Both of you usually need to attend.
- Bring the bank letter and book, marriage certificate, your spouse's ID and house book, photos and the TM.7 form.
- Expect a 30-day 'under consideration' stamp and a home visit by an officer during that period.
- Return to collect the full year's extension.
Officers want to see a genuine shared life: clothes in the wardrobe, wedding photos, neighbours who know you. Paper marriages are prosecuted.