Thailand Work Permit Requirements: Documents Checklist 2026

A Thai work permit application involves two separate sets of paperwork: yours, and your employer’s. Missing or outdated documents on either side are the most common reason applications stall. Here is the complete checklist for 2026, organised by who provides what.

Overview: two parties, two document sets

Thai immigration and the Ministry of Labour require evidence from both the foreign worker and the sponsoring Thai company. Your application can’t move forward until both sets are complete and current. An outdated company document is just as likely to cause a rejection as a missing personal one.

The foreign worker’s (your) documents

For your initial work permit application, you’ll need:

• Passport valid for at least 18 months, with blank visa pages
• A Non-Immigrant B visa already in your passport
• Completed application form (WP.1 for a new application, WP.5 in certain cases)
• Four recent passport-style photographs
• Educational certificates and professional qualifications, with certified Thai translations
• Professional licenses, if your role requires one
• Medical certificate from a Thai-licensed doctor confirming you’re fit to work
• Criminal background check from your home country
• Signed employment contract
• Current CV / résumé
• A position necessity letter, if requested by the labour office, explaining why a foreign worker is needed for the role

The employer’s (company’s) documents

Your sponsoring Thai company must provide:

• Company registration certificate from the Department of Business Development
• Relevant business licenses for the company’s operations
• Tax registration certificate
• Proof of Social Security registration for employees
• Company affidavit dated within the last six months
• Proof of 2,000,000 THB in paid-up capital per foreign worker employed
• Payroll records covering the preceding 3–6 months
• Employee list with Thai national ID numbers
• Office photographs and a location map

Combined documents checklist

Before submission, both sides’ documents should be cross-checked together: names, dates, and company details need to match exactly across every form. A single inconsistency between, say, the employment contract and the company affidavit is enough to trigger a request for resubmission.

Annual renewal documents

Renewals require fewer new documents than the initial application, but immigration still expects:

• An updated company affidavit (dated within six months)
• A recent medical certificate
• Updated payroll records
• Confirmation the Thai-to-foreign employee ratio is still being met

Common rejections and how to avoid them

The rejection reasons we see most often:

• Outdated affidavits: the six-month window catches more applicants than you’d expect; always check the date before submitting
• Insufficient capital documentation: the 2,000,000 THB per foreign worker requirement needs clear, current proof, not just a balance sheet line item
• Expired medical certificates: these have a short validity window; get yours close to your submission date, not weeks in advance
• Incorrect employee ratios: the standard minimum is 4 Thai employees per foreign worker; companies under-ratio for their workforce size are flagged

Document organisation tips

Keep a single, complete file with both your documents and your employer’s, in the exact order the labour office expects. We organise every client’s submission packet this way before it goes in, which materially speeds up processing compared to documents submitted piecemeal.

Timeline for document preparation

Realistically, allow 2–4 weeks to gather a complete set, longer if you need certified translations or a fresh criminal background check from abroad. Processing once submitted typically takes a further 2–4 weeks.

Special cases

Some roles and company structures require additional documentation. BOI-promoted companies, regional headquarters, and certain professional licenses (legal, medical, engineering) each carry extra requirements beyond the standard checklist above. We review your specific situation before confirming your document list.

Final checklist before submission

Before you submit, confirm: every document is current (especially the six-month affidavit and the medical certificate), names match exactly across every form, the employee ratio is satisfied, and translations are certified where required.

Frequently asked questions

How much does a work permit cost? Application fees run approximately 3,100 THB for an initial application and 1,500 THB for a renewal. Medical certificates cost 1,500–3,000 THB at a private hospital, and certified translations typically run 300–500 THB per page.

How long does the whole process take? Budget 2–4 weeks to prepare a complete document set, then a further 2–4 weeks for processing once submitted, so 4–8 weeks total from a standing start.

What’s the Thai-to-foreign employee ratio requirement? The standard minimum is 4 Thai employees per foreign worker, though this varies by industry and company structure. We confirm your company’s specific ratio requirement before starting your application. See our full business visa and work permit guide for the visa side of the process.