Your company in Thailand, registered, reported and compliant.
SIAC Consulting is a Bangkok accounting and corporate services firm for small and mid-sized businesses. Company formation, financial reporting, corporate compliance and visa & work permit processing — handled end to end by one bilingual team.
What we do
Financial & Accounting
- Monthly bookkeeping & tax compliance
- Annual financial statements
- Audit coordination & support
- Payroll, VAT, withholding tax
Corporate Legal
- Company registration (Thai Ltd., BOI, FBL)
- Legal documents & contract review
- Corporate secretary & annual filings
- Regulatory compliance & advisory
Visa & Work Permits
- Business visa (Non-B) application & renewals
- Work permit processing for foreign staff
- 90-day reporting & immigration liaison
- Dependent visas & family support
Every filing a Thai company needs, in one place
Open any service to read the full guide — the steps, the documents, the government fees and how long it takes.
Secure a unique company name compliant with Department of Business Development regulations.
View the full brief →The founding document that establishes your company’s legal identity, capital and objectives.
View the full brief →Defines a Thai company’s internal rules: structure, management, meetings and profit distribution.
View the full brief →Starting a company in Thailand involves several key steps. Here is the full process, end to end.
View the full brief →Grown alongside the businesses we serve
Founded in 2006, Siac Consulting has grown alongside the businesses it serves. With roots in Bangkok, we have helped hundreds of entrepreneurs — both local and foreign — turn their ideas into fully operational, compliant and successful enterprises in Thailand.
We specialise in supporting SMEs with essential services: company formation, financial reporting, corporate legal compliance, and visa and work permit processing.
Proven experience since 2006
Nearly two decades guiding SMEs and foreign investors in Thailand.
One partner for all core services
Legal, accounting and immigration — fully integrated under one roof.
Fluent in Thai law & international business
Navigating Thai legal complexity with international standards.
Client longevity and trust
Many clients stay with us for years as they grow regionally.
To provide reliable, compliant and comprehensive business support services that enable entrepreneurs and companies in Thailand to grow with confidence.
What our clients say
Get your company set up and manage your business with ease.
Special thanks to K Noi for their valuable assistance. We completed the annual audit and they were managing accounting tasks effectively.
I used this accounting service for my coffee shop, and it was pretty smooth. They took care of payroll without any glitches, and the financial reports they sent over were clear and even had some useful tips for cost-cutting. Everything was on time, which really saved me a lot of stress.
It’s close to Udom Suk BTS. The staff is very friendly and professional.
Nok is very professional and courteous. She does many things, but she helped me with my long-term visa. I would highly recommend her.
If you’re a foreigner trying to do this yourself, don’t. Get real help — trust me on this one. Totally recommend SIAC.
I thought I could just register a business in Bangkok and get a visa and work permit myself. Biggest mistake ever — total chaos: one person says one thing, another says the opposite, and there’s always one more document nobody told you about.
Eventually I had to give up. A colleague recommended SIAC because he’d had his accounting done by them. Now I’m set up with the business registration package — their team actually knows what they’re doing, and I got my visa and work permit without losing my mind or tons of money. Thanks!
Four steps, no drip-fed invoices
Tell us what you need
A short call or message about your business and what you want to achieve in Thailand.
Receive a fixed-scope quote
Deliverables, timeline, our fee and the government fees — itemised separately, in writing.
We file everything
We prepare the documents and deal with the authorities directly, keeping you updated.
Stay compliant
We track renewal and filing dates so nothing lapses after the setup is done.