Running a service business requires more than just delivering great work — proper documentation is crucial for tax compliance, cash flow control, and financial transparency. Here are the key tax documents every service business should prepare and maintain:

1. Quotation

A quotation outlines the scope of work, pricing, payment terms, and project conditions before work begins. It helps prevent disputes and serves as a reference for invoicing.

2. Service Agreement / Contract

This document defines responsibilities, deliverables, timelines, and payment structure. It protects both parties and supports revenue recognition for accounting purposes.

3. Invoice

An invoice is issued to request payment after services are delivered (or according to agreed milestones). It should clearly state:

• Service description
• Service period
• Amount due
• VAT (if applicable)
• Payment terms

4. Tax Invoice (if VAT-registered)

If your business is VAT-registered, you must issue a proper tax invoice showing:

• VAT amount (e.g., 7%)
• Tax ID of both parties
• Required legal information

This document supports input and output VAT reporting.

5. Receipt

A receipt confirms that payment has been received. It is important for both accounting records and audit evidence.

6. Withholding Tax Certificate

In many countries, service payments may be subject to withholding tax. Clients may deduct tax before payment and provide a withholding tax certificate. This certificate is necessary to claim tax credits and avoid double taxation.