Monthly Bookkeeping & Year-End Closing in Thailand

The monthly cycle that keeps figures usable

In the first week we collect the prior month's paperwork in full: sales and purchase invoices, petty-cash receipts, statements for every bank account, and payroll records. In the second week we post and reconcile the banks before anything else, because bank balances are externally verifiable evidence; until they agree there is no point issuing reports for the owner to read.

In the third week we close receivables and payables, review overdue items, and send the owner three reports: profit and loss against the prior month, an aged receivables list, and an eight-week cash forecast. The final week covers the month's tax filings and closing the document file so it is audit-ready at year-end.

A chart of accounts shaped by the business, not a one-size template

A chart set too loosely produces unreadable reports: inbound and outbound freight in one account makes cost of sales incalculable, and every online ad channel lumped together hides which one pays. We build the chart from the questions the owner asks most, then design codes that answer them without extra manual summaries.

For multi-branch or multi-line businesses we add dimensions alongside the account codes so branch and product performance come from one data set. That matters when deciding whether to close a branch or drop a line: the evidence already exists rather than having to be reconstructed invoice by invoice.

Year-end close and the handover to the auditor

A smooth year-end comes from three habits maintained for twelve months: reconciling banks every month without letting one slip, reviewing aged receivables and payables quarterly, and filing original documents by month with an index. Companies that do all three typically close within six weeks of period end; those that do not usually take three to four months.

At handover we give the auditor the same pack format every year: trial balance, adjustment papers, bank reconciliations, aged receivables, a fixed-asset register with depreciation, and copies of live contracts. Consistency cuts repeat questions and the hours that ultimately become the audit fee.

When to act, and when waiting is fine

• You are still keeping the books in a spreadsheet

  Move once you have permanent staff or more than one bank account; manual reconciliation starts to fail

• Reports arrive more than forty-five days after month end

  That is too late to act on; put a delivery date in the service agreement

• You are about to apply for a bank facility

  Align three years of statements with the returns already filed; unexplained differences stall the application

• You hold inventory but have never counted it

  Start quarterly counts now and keep the sheets; the auditor asks for them every year