1. Purchase Order Reference: Include when the client has provided a PO number or when required by client's procurement process

2. Project Milestone Reference: Use when billing is tied to specific project milestones or deliverables

3. Cost Breakdown Structure: Include for complex projects requiring detailed cost allocation across different work packages or cost centers

4. Foreign Currency Conversion: Add when dealing with international clients or multiple currencies, showing exchange rates and conversion calculations

5. Professional Certification: Include for regulated industries requiring professional certification of services rendered

6. Withholding Tax Section: Add for services subject to withholding tax under UAE tax treaties

1. Schedule A - Detailed Time Sheet: Breakdown of hours worked by different team members or on different project components

2. Schedule B - Materials Breakdown: Detailed list of materials used with specifications and individual costs

3. Schedule C - Project Progress Report: Summary of project progress and deliverables completed during the billing period

4. Appendix 1 - Supporting Documents: Copies of relevant delivery notes, approval certificates, or other supporting documentation

5. Appendix 2 - Rate Card: Agreed rates for different service categories or personnel levels