Quarter-Hour Billing Increment (15-Minute)

Overview

Quarter-hour billing increments are a standard invoicing practice where professional time is billed in 15-minute blocks, balancing administrative simplicity with reasonable precision for both service providers and clients.

How It Works

All tasks are rounded to the nearest 0.25 hour:

• 0.00 (0 min)
• 0.25 (15 min)
• 0.50 (30 min)
• 0.75 (45 min)
• 1.00 (60 min)

Using the 7-minute rule:

• 1-7 min → 0.00
• 8-22 min → 0.25
• 23-37 min → 0.50
• 38-52 min → 0.75
• 53+ min → 1.00+

Industry Usage

Legal Services: Most common billing increment Accounting: Widely used for client work Consulting: Traditional standard Engineering: Professional services billing

Advantages

For Service Providers:

• Simpler calculations
• Standardized across industry
• Reduces administrative overhead
• Easier mental math

For Clients:

• Predictable rounding
• Industry-standard practice
• Easier to estimate costs

Alternatives

6-Minute Increments (Tenths):

• More precise (0.1 hour = 6 min)
• Common in legal billing
• Also called "tenth of an hour"

1-Minute Precision:

• Most accurate
• Enabled by modern software
• Growing trend

Pricing

N/A - This is a billing practice.