Accounting Firm vs In-House Accountant for a Thai Company
The decision is rarely about the monthly fee. It is about transaction volume, tax complexity, and how much risk the company can absorb if the person handling the books resigns mid-year.
In short
Companies with modest document volume and no internal accounting system usually do better with a firm: a registered bookkeeper, filings made on the statutory calendar, and continuity when someone is away. An in-house accountant makes sense with high daily transaction volume, a need for management numbers in real time, or internal systems to maintain. Growing companies often run both, with staff controlling documents and a firm closing the accounts and filing.
Side-by-side comparison
| Criterion | Accounting firm | In-house accountant |
|---|---|---|
| Total monthly cost | Fee scaled to document volume | Salary, social security, benefits and software |
| Continuity when someone leaves | Team picks the work up | Work stalls until a replacement is hired |
| Speed of management figures | On the agreed submission cycle | Near real time |
| Registered bookkeeper | Provided as standard | You must verify qualifications yourself |
| Breadth of expertise | Access to several specialists | Limited to one person's experience |
| Control of source documents | Requires discipline in sending documents on time | Handled on the spot |
| Responsibility for filing errors | Defined in the service contract | Sits with the company as employer |
| Year-end close and auditor liaison | Routine work | Needs specific experience to run smoothly |
Choose Accounting firm when
- Limited monthly documents with a stable transaction pattern
- No internal controls yet and a need for someone to own the tax calendar
- A requirement for continuity not tied to one employee
- A need for someone to coordinate with the auditor at year end
Choose In-house accountant when
- High daily transaction volume requiring same-day entry
- Management decisions that depend on daily cost or cash figures
- Inventory or ERP systems integrated with the ledger
- Unusual transactions that need explaining on site regularly
Frequently asked questions
- Can we use both at once?
- Yes, and it is common in scaling companies. Staff handle invoicing and daily entries; the firm reviews, closes the accounts, files returns and deals with the auditor. You get speed and continuity together.
- Can we change accounting firm mid-year?
- Yes, but insist on a full handover: ledgers, trial balance, debtor and creditor detail, fixed-asset and depreciation schedules, and evidence of every return filed that year. Without that set, the year-end close becomes painful.
- Who is liable for a penalty after a wrong filing?
- It depends on the cause. Errors within the provider's agreed scope should be theirs; late or incomplete documents from your side are the company's responsibility. A contract that states submission deadlines and scope prevents most disputes.
- Does a dormant company still need this?
- Yes. Every Thai juristic person must keep accounts with a qualified bookkeeper and file financial statements and tax returns even with no revenue. Accumulated penalties usually exceed a year of service fees.
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