Legal service for foreign clients
Financial Statement Closing & Back-Year Cleanup in Thailand
Auditable closing packs, with back-filing handled at controlled penalty cost.
Quick answer
Closing is not printing a balance sheet; it is proving every balance with evidence — bank figures tied to statements, receivables supported line by line, allowances and deferred tax computed. Companies years behind can be brought current by working from the oldest year forward with penalties estimated in advance so there is no surprise bill.
From THB 12,000 — From THB 12,000 per back year restated · 2–5 weeks per fiscal year, depending on document completeness
Who this is for
- Companies one or more years behind
- Firms with mismatched opening balances after a staff change
- Businesses needing statements for banks or partners
- Companies preparing to dissolve or liquidate
What you receive
- Working papers proving each significant balance
- Balance sheet, income statement, and cash-flow statement
- Adjusting entries with audit-ready explanations
- A penalty estimate table for late submissions
Documents to prepare
- Ledgers and trial balances for outstanding years
- Complete monthly bank statements
- Outstanding balances on both sides plus the counted stock figure
- Filed returns and tax payment receipts
How it works
4-step process
- 1
Assess the gap
Identify missing years, unprovable balances, and accumulated penalties.
- 2
Rebuild reliable opening balances
Evidence is rebuilt from banks, suppliers, and sales systems.
- 3
Adjust and close year by year
Older years close first and roll forward in sequence.
- 4
Audit and file
Coordinate the CPA and file with both the DBD and Revenue Department.
In depth
Financial Statement Closing & Back-Year Cleanup: what foreign clients need to know
Closing the accounts is not adding twelve months together and printing a report. It is confirming that every balance carries evidence an outsider can test: cash agrees with the banks, receivables reflect what is genuinely collectible, inventory matches what was counted, and liabilities are complete with nothing left unaccrued. A tightly closed set shortens the audit, eases a credit application, and gives weight to talks with investors. This page sets out the closing sequence we use, the timeline to expect, and the items that most often derail a set of statements late in the process.
A closing sequence that starts with provable balances
We always begin with items backed by outside evidence: every deposit account, borrowings and outstanding balances with lenders, then taxes payable which can be tied to the returns already filed. The order matters, because adjusting internal estimates such as depreciation or doubtful debts while the external base still disagrees means doing the work twice. Once that first group is settled we move to receivables, payables, inventory and intragroup balances.
Next come the judgemental items, and we write down the reasoning for each: the basis for provisioning receivables over a year old, the assumptions behind asset useful lives, and how slow-moving stock is measured. Those judgement memos are the first thing an auditor asks for, and they are why companies that prepare them in advance rarely have to revise the statements repeatedly.
The timeline to expect and what slows it down
Companies that reconcile banks every month and keep an orderly document file usually close within four to six weeks of period end. Those with unposted months or no stock count typically take two to three times longer. The biggest delay is rarely transaction volume; it is missing documents and explanations that have to be chased from people who have already left. Pre-close work in the final month of the period is therefore worth far more than effort spent after it.
We run a pre-close checklist in that final month: confirming balances with major counterparties, counting inventory with signed count sheets, reviewing contracts that straddle the period end to see how revenue or deferrals should fall, and reconciling the fixed asset register against what physically exists. Those four steps remove the surprises, and turn the statutory filing date into something planned rather than hoped for.
Statements that stand up with lenders and investors
Outside readers always compare the statements with the tax returns. Differences arise naturally — expenses disallowed for tax, or different revenue recognition — but a difference nobody can explain is the warning sign that stalls a file. We therefore keep a reconciliation between accounting and taxable profit ready every year, so questions get answered on the day they are asked instead of after a search.
For companies raising capital or selling a stake, we add the supporting pack buyers ask for as standard: revenue by customer and by product line, three years of monthly gross margin, all related-party dealings, and commitments not yet on the face of the statements such as long leases and guarantees. That pack shortens due diligence considerably and reduces the chance of a price chip justified by unclear information.
Cost structure: government fees vs professional fees
| Item | Official fee | Professional fee | Note |
|---|---|---|---|
| Annual close for a small company with all months posted | A registrar filing fee applies at the rate currently notified | THB 12,000–35,000 per period | Includes adjustment workpapers and the book-to-tax reconciliation |
| Close for a company with inventory or multiple branches | A registrar filing fee applies at the rate currently notified | THB 40,000–120,000 per period | Includes count review and consolidating branch data |
| Restating prior statements or closing a missed period | Late-filing penalties or surcharges may apply under the law | THB 30,000–150,000 per outstanding period | Scoped by unposted months and how complete the surviving documents are |
A manufacturer carrying inventory above its real value
Situation: Raw materials sitting for three years were carried entirely at original cost
What we did: We banded stock by movement age, counted with the production team, and recognised a write-down with the basis documented
Outcome: The statements showed a gross margin usable for pricing, and the auditor accepted the basis without a second information request
A company refused a facility because two sets of figures disagreed
Situation: The statements given to the bank showed revenue materially different from the tax returns, unexplained
What we did: We traced the difference month by month, separated recognition basis from genuine posting errors, and produced an explanatory memo with corrected statements
Outcome: The bank could proceed from a single document set, and the next annual review raised no repeat questions
When to act, and when waiting is fine
You have not counted inventory before period end
Count as close to period end as possible and keep signed count sheets; a retrospective estimate invites challenge
You have many intragroup transactions
Agree balances on both sides before closing; intragroup differences get close attention every year
You are changing auditor this period
Have the prior period's workpapers and judgement memos ready; a new auditor must do extra work on opening balances
The filing deadline is near with months still unposted
Prioritise what allows a compliant filing first and plan the remainder afterwards; late filing carries defined penalties
FAQ
Frequently asked questions
Five years behind — is it fixable?
Yes: work oldest year first and accept accrued fines — still cheaper than a back assessment.
A year has no documents at all
Reconstruct from bank and counterparty records and document the estimation method.
Must a dormant company still close?
Yes, every year until dissolution and liquidation are registered as complete.
Must a company's statements always be audited?
A limited company generally requires audit by a licensed auditor and files with the registrar by the due date, while small partnerships have size-based relief set by law.
How can the close be faster when branch documents arrive late?
Set a document cutoff per branch in an internal rule and have branches send scans as documents are issued, with originals following.
What if we find a prior-year error after filing?
Assess materiality first, then choose correctly between adjusting in the current period and amending the filed statements, considering the tax consequences that follow.
Can you take only the close while we keep the books ourselves?
Yes. We first review the trial balance, asset register and bank reconciliations to judge how much retrospective correction the close will need.
Related services
Monthly Bookkeeping & Year-End Closing
Bookkeepers registered with the DBD, from daily entries to filed statements.
Statutory Audit by Licensed CPAs
Audit reports accepted by the DBD, with control observations you can act on.
Tax Health Check Before the Revenue Calls
Find and close exposures early — far cheaper than an assessment.
Written by: Thai Law & Accounting Services — attorneys and licensed accountants
Reviewed by: Reviewed by a Notarial Services Attorney registered with the Lawyers Council of Thailand.
Last updated: 2026-08
Information as of August 2026. Government fees and processing times change — verify with the relevant agency before acting, or let our team verify for you.