Do private investigators bill hourly?

Many do. Hourly billing is common for investigations and surveillance. Some services, like background checks, may be billed as flat fees.

Should a PI invoice include detailed investigative notes?

Usually no. Invoices often keep details minimal for confidentiality. Detailed logs or reports can be provided separately if required and appropriate.

What is a case number on an investigator invoice?

A case number is a reference identifier used to track the matter. It helps clients match invoices to their case and simplifies accounting.

Can surveillance time be billed separately?

Yes. Many investigators itemize surveillance time as its own line item so clients can see how much work was surveillance versus research or reporting.

What payment terms are common for private investigator invoices?

Net 14 is common, though some investigators require due on receipt depending on case type and agreement.

Private Investigator Invoice Template

Q: What should a private investigator invoice template include?

A private investigator invoice template should include case number/matter reference, service period, itemized hours by category (investigation, surveillance, research), flat-fee services (background checks, skip tracing), reporting/court support if applicable, totals, and payment terms.

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.

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Strong structure for large projects or milestones.

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Private Investigator Invoice Generator

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Items

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$1,200.00

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Name

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Invoice Details

Invoice Number

Issue Date

Due Date

Additional Fields

Notes for client

Payment terms

Tax, Discount & Shipping

Tax Rate (%)

Tax included in prices

Discount (%)

Shipping (USD)

Payment Methods

Totals

Subtotal$1,200.00

Total (USD)$1,200.00

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)

Common PI line items

Investigation services (hours)
Surveillance time (hours)
Research and records review
Background checks or skip tracing
Case report preparation
Court/legal support (when applicable)

Totals

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

This keeps invoices professional while protecting confidentiality.

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

Including a service period and offering time logs separately keeps the invoice itself clean and easy to read.

Private Investigator Invoice Template

Download Popular Private Investigator Invoice Templates

Create Your Own Custom Invoice!

Clean Private Investigator Invoice Template

Minimal Private Investigator Invoice Template

Bold Private Investigator Invoice Template

Classic Private Investigator Invoice Template

Simple Private Investigator Invoice Template

Detailed Private Investigator Invoice Template

Modern Private Investigator Invoice Template

Use Free Private Investigator Invoice Generator

Private Investigator Invoice Generator

What to Include on a Private Investigator Invoice

Private Investigator Billing Models: Hourly and Case-Based

Confidentiality and Minimal Detail on PI Invoices

Time Logs, Reports, and Supporting Documentation

Frequently Asked Questions