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ILCInternational Language Center

SSO / Labor / Revenue / Driving License

SSO, Labor, Revenue & Driving-License Letters — Translated, Certified, and Filed in One Stack

Covers SSO Section 33/39/40 certificates, employer SSO-1-10 history, Labor-Welfare employment letter, PND.91/50, PP.20 VAT, 1949 & 1968 IDP, foreign-license conversion, and proxy renewal of Thai license while abroad.

14+ document typesPer SSO Act, Revenue Code, Motor Vehicle ActHCCH Apostille 2025

Social Security (SSO)

SSO Section 33 Insured-Person Certificate

SSO-M33

Official certificate that a salaried employee is insured under SSO Section 33 — needed for visas, loans, and tenancy.

Free at SSO office; THB 50–100 service fee online

SSO Section 39 Voluntary Insured Certificate

SSO-M39

Voluntary continuation of SSO coverage after leaving employment — certificate proves ongoing social-security status.

Free certificate; monthly contribution THB 432

SSO Section 40 Self-Employed Certificate

SSO-M40

Voluntary self-employed SSO coverage — certificate confirms tier and contribution history.

Free; monthly contribution THB 70/100/300 by tier

SSO Employer Contribution History (SSO 1-10)

SSO-PAY

Employer-side contribution history — needed for BOI, work-permit renewal, and audit.

Free at SSO; service fee for proxy filing

Labor Welfare & Employment

Employment Certificate (Labor Welfare Office)

LAB-EMP

Official employment certificate verified by the Labor Welfare Office — used for visa, embassy, and overseas employment.

Free at office; service fee for legalization stack

Thai Overseas Worker Registration (Department of Employment)

DOE-OVS

Mandatory registration before leaving Thailand for overseas employment — gives consular protection and SSO Overseas Worker Fund coverage.

Overseas Workers Fund ~THB 300–500 + insurance per destination

Salary Slip & Income Certification

LAB-PAY

Certified translation of payslips and HR income letters for visa, mortgage, or relocation.

Service fee per page

Revenue Department / Income

Revenue Department Income Tax Certificate (PND.91)

RD-PND91

Certified copy of annual income-tax return (PND.91) — strongest single-document income proof for embassies and banks.

Free copy at RD branch; service fee for certified set

Corporate Income Tax Certificate (PND.50)

RD-PND50

Certified annual corporate income tax filing — required for BOI, tenders, and foreign joint ventures.

Free at RD; service fee for proxy filing

VAT Registration Certificate (PP.20)

RD-PP20

Official VAT registration certificate — mandatory for B2B invoicing, BOI, and import-export operations.

Free issuance; service fee for re-issuance and translation

Driving License (DLT)

International Driving Permit (IDP) — 1949 & 1968 Conventions

DLT-IDP

Thai-issued IDP valid in 150+ countries — 1949 Convention (1 yr) or 1968 Convention (3 yr).

THB 505 (1949) / THB 505 (1968)

Thai Driving License Translation + MFA Consular

DLT-TRANS

MoJ-certified translation of Thai driving license + MFA Consular legalization — accepted by most foreign DMVs.

Service fee + MFA fee THB 400 + embassy fee

Foreign Driving License Conversion to Thai License

DLT-CONV

Convert valid foreign license to Thai 2-year license — waive theory + practical tests under DLT regulation.

THB 305 + Thai medical certificate ~THB 500

Thai 5-Year License Renewal While Abroad

DLT-5YR

Proxy filing for Thai license renewal while overseas — power of attorney + apostilled medical + photo.

THB 505 renewal + service fee + Apostille fees abroad

Free consultation — SSO, Labor, Revenue, Driving License — LINE @NAATI · Tel 080-5578887

SSO, Labor, Revenue and Driving-Licence Letters

Thai employment and residency come with a constant stream of official letters and certifications: Social Security Office (SSO) Section 33 / 39 / 40 contribution certificates, SSO 1-10 employment history, Ministry of Labor employment welfare certificate, Revenue Department PND.90/91/50 tax filings, PP.20 VAT registration certificate, driving-licence conversions (1949 IDP, 1968 IDP, foreign-licence exchange), and Department of Land Transport DL renewal for Thais abroad. ILC handles each request end-to-end: authenticated request letter to the authority, in-person filing, MoJ translation, notarial certification and courier delivery worldwide. These letters are frequently required by foreign banks for KYC, immigration authorities for source-of-funds evidence, and overseas insurance companies for policy underwriting.

End-to-End Process — work authorization letters

The workflow below reflects current 2025–2026 practice with the relevant Thai authority and factors in queue seasonality, translation dependencies, and cross-agency handoffs.

  1. 1) Request letter drafting

    Bilingual request letter aligned to the authority's standard template.

  2. 2) Authority filing

    In-person filing with signed authorisation from the applicant.

  3. 3) Certificate issuance

    3–7 working days depending on document type.

  4. 4) Translation and notarisation

    Certified English translation and NSA notarisation.

  5. 5) MFA + embassy chain

    For use overseas, MFA legalization plus destination-embassy stamp.

  6. 6) International courier delivery

    DHL / FedEx tracked shipment worldwide.

Documents and Preconditions

The checklist below covers standard files. Complex or corporate matters can add supplementary certificates, board resolutions, or notarised affidavits; ILC brief these during the intake call.

  • Passport / Thai ID copy
  • Power of Attorney for authority filings
  • Prior employment or tax filing data
  • Purpose statement (immigration, KYC, insurance)
  • Preferred delivery address
  • Payment of official fees

Who Uses This Service

Real-world scenarios where clients rely on this service every month, spanning individual, family, and corporate mandates.

Foreign KYC evidence

SSO 1-10 employment history for opening overseas bank account.

Immigration source-of-funds

Revenue PND.91 tax return translated and notarised for visa application.

Driving-licence conversion

Thai licence converted to UK, EU or Australian licence with MFA + embassy chain.

Foreign licence exchange in Thailand

Foreign licence exchanged for Thai 5-year licence at Department of Land Transport.

Options and Trade-offs

Three delivery paths are usually available. We select the option that balances cost, deadline pressure, and destination-authority preferences.

OptionProsTrade-offs
Simple certificateFastest (3 days)Cannot be used overseas without MFA + embassy
Certificate + notarialAccepted by most banks and insurersCannot be used for civil-registry filings
Full chain (MFA + embassy)Universally accepted7–14 working days end-to-end

In-Depth FAQ

Can I request SSO letters after resignation?

Yes; SSO retains employment history for many years and issues certificates on request.

Does the Thai licence conversion require a driving test overseas?

It depends on the destination — the UK often accepts direct exchange, whereas the USA requires a test in most states.

Can Revenue Department letters be issued in English?

Only the receipt and certificate; a certified translation is needed for the return itself.

Is the 1949 IDP still valid?

Yes for the 100+ countries that have not ratified the 1968 convention; both may be needed for extended overseas driving.

Local Expert Insight

Expert perspective: SSO, Labor, Revenue and Driving-Licence Letters

“The SSO, Labor, Revenue and Driving-Licence Letters files we see most often are ones the applicant filed themselves and got rejected for an outdated template or a passport-name mismatch — that's why we audit every document before touching translation.”
กองบรรณาธิการ ILC
Legal Documentation Editorial Team

Cost ladder

Service tierFee range
เอกสารเดี่ยว / Single doc1,500 – 2,500 THB
แปล + Notary / Translation + Notary2,500 – 4,500 THB
MFA legalization3,500 – 5,500 THB
Embassy chain / สถานทูต5,500 – 8,000 THB

Timeline (Day 1 → Day N)

  1. Day 1Intake, document audit, written quote & timeline
  2. Day 2-3Certified translation + two-tier QA by NAATI/MoJ translators
  3. Day 3-4MFA Chaengwattana legalization queued & retrieved
  4. Day 5-7Destination embassy filing & EMS/DHL return to client

Case snapshot (anonymized)

A corporate client (name withheld) needed SSO, Labor, Revenue and Driving-Licence Letters on a tight embassy deadline. ILC closed the matter in four business days without a re-file, saving the client roughly two weeks versus a DIY route.

Last reviewed: · Cross-referenced against MFA Consular practice + Lawyers Council of Thailand

A working guide to work-authorization-letters in Thailand

work-authorization-letters has been the daily bread of our Bangkok office since 2004. Each matter is opened as a numbered case file that carries the same audit trail — intake note, translator sign-off, attorney jurat, and MFA/embassy stamps — from the first LINE message through to final courier hand-off. Every work-authorization-letters matter is scoped by a senior specialist on LINE Official @NAATI or by email at ilc@thainotary.co.th before any file moves.

How the workflow runs end-to-end

Every deliverable ships with a scanned colour PDF archive alongside the physical original, so the client can lodge with foreign embassies, DHA ImmiAccount, or destination universities the same day the original is dispatched by DHL, FedEx, EMS, or Kerry.

Who this service is for

Individual applicants typically move from first LINE message to signed jurat in under 72 hours; corporate and cross-border matters are quoted on their own SLA depending on volume, destination, and required chain of legalization.

Coverage, fees, and turnaround

International return is handled by DHL Express, FedEx International Priority, or Thailand Post EMS depending on destination and client preference; each option carries a signed proof-of-delivery scan sent to the client's registered email once the pack is received abroad.

Quality assurance and confidentiality

For matters that go before Thai courts, translations are re-certified under the Ministry of Justice's court-listed translator register so the deliverable is admissible as a documentary exhibit under the Civil Procedure Code without a separate hearing on authenticity.

Start your work-authorization-letters matter today

Reach ILC on LINE Official @NAATI, email ilc@thainotary.co.th, or phone 080-5578887. Office hours are Monday to Sunday, 08:30 to 20:00 Bangkok time. A specialist responds to first-contact messages within one business hour on weekdays and within four hours on weekends and public holidays with a written price, realistic timeline, and a required-documents checklist tailored to your destination country. There is no charge for the initial consultation, and no obligation to proceed after receiving the quote — ILCearns repeat business by delivering the first work-authorization-letters matter cleanly and on time, not by locking clients into open-ended retainers.

Local Expert Insight

Expert perspective: work-authorization-letters

“The work-authorization-letters files we see most often are ones the applicant filed themselves and got rejected for an outdated template or a passport-name mismatch — that's why we audit every document before touching translation.”
กองบรรณาธิการ ILC
Legal Documentation Editorial Team

Cost ladder

Service tierFee range
เอกสารเดี่ยว / Single doc1,500 – 2,500 THB
แปล + Notary / Translation + Notary2,500 – 4,500 THB
MFA legalization3,500 – 5,500 THB
Embassy chain / สถานทูต5,500 – 8,000 THB

Timeline (Day 1 → Day N)

  1. Day 1Intake, document audit, written quote & timeline
  2. Day 2-3Certified translation + two-tier QA by NAATI/MoJ translators
  3. Day 3-4MFA Chaengwattana legalization queued & retrieved
  4. Day 5-7Destination embassy filing & EMS/DHL return to client

Case snapshot (anonymized)

A corporate client (name withheld) needed work-authorization-letters on a tight embassy deadline. ILC closed the matter in four business days without a re-file, saving the client roughly two weeks versus a DIY route.

Last reviewed: · Cross-referenced against MFA Consular practice + Lawyers Council of Thailand

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