Private Investigator Invoice Template
Create professional private investigator invoices for case work with clear service periods and case references. This private investigator invoice template supports investigation hours, surveillance, research, background checks, report preparation, and court support—ideal for investigators billing clients while keeping documentation clear and confidential. Download instantly in PDF, Word, or Excel format.
Private Investigator Invoice Generator
What to Include on a Private Investigator Invoice
Private investigator invoices should clearly reference the case and time period without exposing sensitive details.
Case details- Case number/matter reference
- Service period
- Case type (optional)
- Investigation services (hours)
- Surveillance time (hours)
- Research and records review
- Background checks or skip tracing
- Case report preparation
- Court/legal support (when applicable)
- Subtotal, tax (if applicable), total due
- Payment terms and instructions
Private Investigator Billing Models: Hourly and Case-Based
Private investigators often bill using these common models.
1) Hourly billing
Most common for investigations and surveillance work. Hours are billed by category (investigation, surveillance, research).
2) Flat-fee services
Some tasks (background checks, skip tracing) may be billed as fixed fees.
3) Case-based projects
A defined scope with a packaged price for a specific objective.
Using a case number and service period keeps invoices organized for clients and helps approvals.
Confidentiality and Minimal Detail on PI Invoices
Clients often need invoices for records, but investigative work can be sensitive.
Best practices- Use case references rather than detailed narratives
- Summarize work in broad categories (surveillance, research, reporting)
- Provide more detailed logs separately if required and appropriate
Time Logs, Reports, and Supporting Documentation
Some clients request backup for hours billed.
Common support documents- Time logs by date and category
- Report delivery confirmation
- Summary of deliverables provided