Bookkeeping Basics for Singapore SMEs: What Records to Keep and For How Long
Good bookkeeping is the quiet foundation everything else sits on: your tax filings, your GST returns, your ability to apply for a bank loan, and your peace of mind if IRAS or ACRA ever comes asking questions. Yet it's often the first thing a growing business lets slide.
Here's a practical rundown of what to keep, and for how long.
Why Bookkeeping Matters Beyond Tax Season
Every figure in your tax return, your GST filing, and your annual financial statements has to be traceable back to a source document. If you can't produce the paperwork behind a number, IRAS can disallow the claim, or worse, raise an estimated assessment based on their own judgment of what you should have earned.
Clean books also make life dramatically easier at year-end close, when applying for financing, or if you ever bring in an investor who wants to see your numbers.
What Counts as a Business Record
Broadly, two categories of records need to be kept:
Source Documents
The paper trail behind every transaction:
- Sales invoices and receipts issued to customers
- Purchase invoices and receipts from suppliers
- Bank statements and payment records
- Contracts and agreements
- Payroll records (payslips, CPF contribution records)
- Import/export permits, if applicable
- Credit notes and debit notes
Accounting Records
The records that summarise those transactions:
- General ledger and journals
- Trial balance
- Fixed asset register
- Any working papers used to prepare financial statements
How Long to Keep Records
Under the Income Tax Act and GST Act, businesses must retain source documents and accounting records for at least 5 years from the relevant Year of Assessment (or, for GST, from the end of the relevant accounting period). Falling short is an offence: IRAS can raise an estimated assessment, disallow expense or input tax claims, and impose fines of up to S$5,000.
Separately, under the Companies Act, companies must keep accounting records for at least 5 years from the end of the financial year to which they relate. This is enforced by ACRA, with penalties of up to S$10,000 for non-compliance.
As a rule of thumb, most Singapore businesses keep records for a minimum of five years, but it's worth holding onto them longer if:
- You've made a loss that's being carried forward (keep records until the loss is fully utilised)
- You've claimed capital allowances on an asset (keep records for the asset's full useful life)
- You're involved in any dispute or ongoing audit with IRAS
Digital Records Are Fine, With Conditions
You don't need to keep physical paper for everything. IRAS accepts electronic records, provided they're legible, complete, and can be retrieved and reproduced in their original form when needed. Scanned copies of physical documents are generally acceptable, but check that your scanning process captures all details clearly, including handwritten notes, stamps, or signatures on the original.
Simple Habits That Keep You Audit-Ready
- Separate business and personal finances completely. A dedicated business bank account and card make reconciliation far easier and avoid disputes over what's a business expense.
- Reconcile your bank account monthly, not just at year-end. Catching a discrepancy in the month it happens is far easier than untangling it a year later.
- Number your invoices and receipts sequentially so gaps are obvious.
- Use accounting software rather than a spreadsheet once your transaction volume grows it reduces manual entry errors and usually has an audit trail built in.
- Back up digital records in at least two locations, including one off-site or cloud-based, in case of hardware failure.
What Happens If Your Records Fall Short
Missing or incomplete records don't just risk penalties. During a GST or income tax audit, IRAS can disallow expense claims it can't verify, which increases your taxable income and the tax you owe, sometimes with penalties and interest on top. For GST-registered businesses, poor records can also delay or jeopardise input tax claims.
If your bookkeeping has fallen behind: the earliest and cheapest time to fix it is now, not when a filing deadline or an audit notice is looming.
Want a second pair of eyes on your record-keeping?
Adpeco Integrated Services has supported Singapore businesses with accounting and bookkeeping since 1986. Contact us to review your current record-keeping practices.