Supplier Invoice Template for Singapore

A supplier invoice is your formal request for payment when providing goods or services to customers in Singapore. This document must comply with specific legal requirements under Singapore law, including GST regulations, company registration standards, and electronic transaction rules. Getting your invoicing right protects your business legally and ensures you can collect payment efficiently.

When do you need this document?

You need a supplier invoice every time you complete a sale or provide services to a customer. This includes selling physical products, delivering professional services, providing consultancy work, or completing project milestones. If your business is GST-registered, you must issue a tax invoice within 30 days of supply. Even non-GST registered businesses should use proper invoices to maintain professional standards and legal protection. The invoice serves as proof of the transaction, establishes payment terms, and creates a legal record of what was provided and when payment is due.

Key legal considerations

Your supplier invoice must include specific mandatory information to be legally compliant. Under the Companies Act, you must display your business registration number and complete company details. If GST-registered, the Goods and Services Tax Act requires your GST registration number, correct GST calculations at 8%, and specific tax invoice formatting. The Electronic Transactions Act governs digital invoices, requiring proper electronic signatures and secure record storage. Payment terms must be clearly stated to avoid disputes, and all item descriptions should be detailed enough to identify exactly what was supplied. Missing required information can invalidate your invoice for tax purposes and complicate debt collection if payment issues arise.

Legal requirements in Singapore

Singapore law mandates specific invoice elements through multiple regulations. The GST Act requires tax invoices to show supplier and customer details, supply date, description of goods or services, GST amount, and total consideration. Your ACRA business registration number must appear prominently as per regulatory requirements. The Income Tax Act specifies that invoices must support business expense claims and tax deductions, requiring detailed documentation. For electronic invoices, the Electronic Transactions Act demands secure digital signatures and proper electronic record maintenance. Payment terms must comply with Singapore contract law, typically allowing 30 days unless otherwise agreed. Keep all invoice records for at least 5 years as required by tax authorities, and ensure GST-registered customers receive compliant tax invoices to support their input tax claims.