Monthly Retainer Invoice Template

Retainer Invoice Fundamentals

A retainer invoice bills for a pre-agreed monthly fee in exchange for guaranteed availability and a set number of hours or deliverables. Retainers provide predictable income for freelancers and predictable costs for clients.

Retainer Billing Models

Model	How It Works	Best For
Fixed Hours	Client buys X hours/month at a set rate	Ongoing development, support
Fixed Deliverables	Agreed monthly deliverables for a flat fee	Content creation, social media
Access Retainer	Fee for guaranteed availability/priority	Advisory, on-call support
Hybrid	Base fee + hourly overage for additional work	Most common model

Tracking Retainer Hours

Retainer: 20 hours/month at $120/hr = $2,400/month

March 2024 Usage:
  Week 1: 5.5 hours
  Week 2: 4.0 hours
  Week 3: 6.25 hours
  Week 4: 4.25 hours
  Total Used: 20.0 / 20.0 hours
  Rollover: 0.0 hours

Sample Retainer Invoice

Invoice #RET-2024-03
Period: March 2024
Agreement: Monthly Development Retainer

Line Items:
  Monthly Retainer (20 hrs @ $120/hr)       $2,400.00
  Overage Hours (3.5 hrs @ $150/hr)         $525.00
  Rollover Credit from February (-2 hrs)     -$240.00

  Subtotal:  $2,685.00
  Tax (0%):  $0.00
  Total:     $2,685.00

  Hour Summary:
  Retainer hours: 20.0
  Used: 23.5
  Overage: 3.5 (billed at 1.25x rate)
  Rollover from Feb: -2.0
  Net overage: 1.5 hrs

Retainer Best Practices

1. Invoice at the start of each month for the retainer fee
2. Report hours used even if the client does not ask -- transparency builds trust
3. Define rollover policy -- do unused hours carry over? For how long?
4. Set overage rates (typically 1.25x-1.5x the retainer rate)
5. Review quarterly -- adjust hours based on actual usage patterns