Bookkeeping Rules in Singapore: IRAS Compliance Guide for Businesses

Singapore Bookkeeping Requirements

Singapore is known for its business-friendly environment, but that does not mean bookkeeping is optional. The Inland Revenue Authority of Singapore (IRAS) and the Accounting and Corporate Regulatory Authority (ACRA) impose clear record-keeping requirements on all businesses.

Companies incorporated in Singapore must comply with the Singapore Financial Reporting Standards (SFRS) and maintain records that are sufficient to explain their transactions and financial position.

What Records Must You Keep?

All Companies

Every company in Singapore must keep records that show:

• All sums of money received and spent, with details of the receipts and payments
• All sales and purchases of goods and services
• The assets and liabilities of the company
• Records that enable the preparation of true and fair financial statements

Specific Documents Required

At minimum, Singapore businesses should maintain:

Source documents - Invoices, receipts, credit notes, debit notes, vouchers, and bank statements that evidence every transaction.

Accounting records - General ledger, journals, cash books, and trial balances.

Bank records - Complete bank statements, deposit slips, and records of all electronic transactions.

GST records - If GST registered, detailed records of output tax charged and input tax claimed, with supporting tax invoices.

Payroll records - CPF contributions, income tax (Form IR8A), and records of all employee compensation.

Record Retention Period

Singapore law requires businesses to keep their records for at least five years from the relevant Year of Assessment (YA). For GST records, the retention period is five years from the end of the accounting period to which the records relate.

Records can be kept in electronic form, and cloud-based storage using software like Xero is accepted, provided the records are complete and accessible.

Corporate Tax Requirements

Singapore has a flat corporate tax rate of 17%, with partial tax exemptions for the first $200,000 of chargeable income for qualifying companies. To claim these exemptions and file accurate corporate tax returns, your bookkeeping must be thorough.

Estimated Chargeable Income (ECI)

Companies must file their ECI within three months of the end of their financial year. This requires having reasonably accurate financial records available shortly after year-end.

Form C / Form C-S

The annual Corporate Tax Return must be filed by 30 November each year (for paper filing) or 15 December (for e-filing). Form C-S is a simplified return available to companies with annual revenue of $5 million or less.

To complete these returns accurately, you need well-maintained books that clearly show revenue, allowable deductions, capital allowances, and any tax-exempt income.

GST Requirements

Businesses with taxable turnover exceeding $1 million (the threshold is set to increase to $1.5 million from 2026) must register for GST. The current GST rate is 9%.

GST Record-Keeping

GST-registered businesses must keep:

• Tax invoices for all standard-rated supplies exceeding $1,000
• Simplified tax invoices for supplies of $1,000 or less
• Import and export permits
• Credit notes and debit notes
• Records of all input and output tax

GST Filing

GST returns must be filed quarterly, within one month of the end of each prescribed accounting period. Accurate and timely bookkeeping ensures your GST returns are correct and filed on schedule.

CPF and Payroll Obligations

Employers must contribute to the Central Provident Fund (CPF) for all Singapore citizen and permanent resident employees. CPF rates vary by age group and employee status:

• Employer contribution: up to 17% for employees under 55
• Employee contribution: up to 20% for employees under 55

Monthly CPF contributions must be paid by the 14th of the following month. Late payments incur interest charges.

Your bookkeeping system must track gross wages, CPF deductions (both employer and employee portions), and other payroll items accurately.

XBRL Filing

Singapore companies (other than those qualifying for exemptions) must file their financial statements in XBRL format with ACRA. This requires your financial data to be structured according to the Singapore XBRL taxonomy.

Xero can export financial data that supports XBRL preparation, though you may need your accountant to handle the final XBRL conversion and submission.

Small Company Exemptions

Small companies that meet at least two of the following criteria may be exempt from audit requirements:

• Total annual revenue of $10 million or less
• Total assets of $10 million or less
• 50 or fewer employees

However, even exempt companies must still maintain proper accounting records and file annual returns with ACRA.

Practical Compliance Steps

1. Use IRAS-compatible software - Xero supports Singapore GST, CPF integration, and local compliance requirements
2. Automate transaction processing - SortBooks helps keep your records current with AI-powered categorisation
3. Issue proper tax invoices - Ensure all invoices meet IRAS requirements for GST claims
4. Reconcile regularly - Monthly reconciliation prevents year-end surprises
5. File on time - Mark ECI, GST, and CPF deadlines in your calendar
6. Engage a local accountant - Singapore tax incentives and exemptions can be complex

Singapore rewards good corporate governance, and proper bookkeeping is a fundamental part of that. With the right tools and processes, meeting your compliance obligations is straightforward and efficient.