What documents are required for a yearly extension of stay in Thailand based on employment with a 90-day Non B visa?

These are the standard requirements, Immigration on Samui could differ and ask some others or less:

Application form TM.7, photograph 4x6 cm., application fee is 1,900 (Application must be made in person)

Copy of applicant’s passport (copy of passport with your photo, last arrival stamp, Re-entry Permit stamp, Departure card (TM.6) and last extend visa)

Certificate of employment prepared in accordance with the form prescribed by the Immigration Bureau (Sor.Tor.Mor.1)

- A table showing the numbers of all foreigners employed by the company, also their salary on monthly and annually basis, and their total salary, is additionally required.

Copy of work permit

Proof of corporate registration e.g. certificate of incorporation of company or partnership certified by the Registrar with validity for 6 months

Copy of list of shareholders certified by the Registrar with validity for 6 months

A copy of latest balance sheet and income statement, together with corporate income tax return (Por.Ngor.Dor.50) and receipt.Copy of Sor.Bor.Chor.3 they must be certified by the Revenue Dept. or by The Department of Business Development.

Copy of 3 latest monthly withholding tax return (Por.Pro.1) showing the name of employees and the alien applicant, together with receipt.

Copy of latest personal income tax return of the applicant (Por.Pro.91), together with receipt (or an explanatory letter)

Copy of 3 latest monthly social security contributions return filed with the Social Security Office (Form Sor.Por.Sor. 1-10)

Copy of 3 latest monthly value add tax return (Por.Pro.30 or Por.Por.36) together with receipt.

Proof of the need of the business to employ the alien e.g. no Thai candidate has applied after advertising such a position

Location map of the place of work

Other supporting documents required by the competent authority (Sor.Tor.Mor.2)

Photographs showing the location of the business

a. Exterior photographs showing the address and the sign of company name

b. Interior photographs showing the employee while working

Original documents of Nos. 5,6,7,8,9 and 10 must be provided.

In case the applicant are accompanied by the family member, proof of family relationship e.g. marriage certificate, birth certificate of their children must be provided. If these documents were issued by a foreign government, they must be certified by such foreign embassy.