IT service providers and managed service providers (MSPs) operate billing models that most generic invoicing templates can’t handle. Between managed services retainers, break-fix hourly billing, hardware procurement with markup, software license pass-through, SLA-based credits, and project work — a single MSP invoice can combine four or five different billing models on one document.
An effective invoice template for IT services needs to clearly separate recurring managed services from one-time project work, distinguish your service fees from hardware/software pass-through costs, and reference SLA agreements that govern service levels and response times.
IT Service Billing Models
Managed Services Retainer (Per-User or Per-Device)
The core of MSP billing. A fixed monthly fee per user or per device covering a defined scope of services: monitoring, patch management, helpdesk support, backup management, and security. Automate with recurring invoices.
Common pricing: $75–$250/user/month or $15–$50/device/month depending on scope and SLA tier.
Break-Fix (Hourly)
Billed per incident or per hour for clients who don’t have a managed services agreement. Typically $100–$200/hour with a 1-hour minimum. Invoice after each service call or weekly/monthly in arrears.
Project-Based
Network infrastructure upgrades, server migrations, cloud transitions, office moves, and security audits. Fixed-price or time-and-materials with milestone billing.
Hardware/Software Procurement
Purchasing and deploying hardware (laptops, servers, networking equipment) and software licenses on behalf of the client. Bill at cost plus markup (typically 10–20%) or at retail price with your margin built in.
Co-Managed IT
Supplementing an internal IT team with specific MSP services (security monitoring, backup management, after-hours support). Billed as a targeted retainer for defined services.
Sample MSP Invoice
| Description | Qty | Unit | Rate | Amount |
| MANAGED SERVICES (March 2026) | ||||
| Managed IT — Gold Tier (per user) | 35 | users | $165 | $5,775.00 |
| Cloud Backup — 500GB (per user) | 35 | users | $12 | $420.00 |
| Email Security Gateway | 35 | users | $8 | $280.00 |
| BREAK-FIX / OUT-OF-SCOPE | ||||
| After-hours emergency: Server outage (3/12) | 2.5 | hours | $200 | $500.00 |
| Conference room AV setup (out of scope) | 1.5 | hours | $150 | $225.00 |
| HARDWARE & SOFTWARE | ||||
| Dell Latitude 5540 Laptop (3 units) | 3 | units | $1,250 | $3,750.00 |
| Microsoft 365 Business Premium (annual) | 5 | licenses | $264 | $1,320.00 |
| SonicWall Firewall Subscription Renewal | 1 | annual | $850 | $850.00 |
| SLA CREDIT: 15-min response guarantee miss (3/15) | -$150.00 |
Note: Managed services are billed in advance (for the upcoming month). Break-fix and hardware are billed in arrears. The SLA credit reflects a missed response time guarantee per the service agreement.
How to Handle SLA Credits
Service Level Agreements define performance guarantees (uptime percentage, response time, resolution time). When you miss an SLA target, the client is entitled to a credit:
- Document the miss: Reference the specific SLA metric, the target, and the actual performance.
- Apply the credit on the next invoice: Show it as a negative line item with a clear description.
- Don’t wait for the client to request it: Proactively applying SLA credits builds trust and demonstrates accountability.
Hardware Markup Best Practices
- Standard markup: 10–20% over your cost is standard for hardware procurement. This covers your sourcing time, configuration, deployment, and warranty management.
- Show the total price, not your cost + markup: Clients don’t need to see your margin. Bill the hardware at a single per-unit price.
- Include configuration and deployment: If you image laptops, configure firewalls, or rack servers, this labor can be either included in the unit price or billed separately.
- Attach the vendor invoice if requested: Some corporate clients require vendor invoices for asset tracking. Provide them with the cost redacted if necessary.
8 Invoicing Tips for IT Service Providers
- Bill managed services in advance. The retainer covers the upcoming month’s services, not the previous month’s. This protects your cash flow.
- Separate recurring from one-time charges. Managed services, break-fix, and hardware should each be their own section on the invoice.
- Reference the SLA tier on the invoice. Note which service tier the client is on (Bronze/Silver/Gold) so there’s no confusion about included vs. out-of-scope work.
- Track ticket numbers for break-fix work. Reference the helpdesk ticket number in each line item description for audit trail purposes.
- Include user/device counts. Show the current count of users and devices covered. If the count changed mid-month, prorate accordingly.
- Invoice hardware separately for large purchases. A $15,000 hardware order on the same invoice as a $5,000 monthly retainer can delay the entire payment. Send separate invoices.
- Set up automatic payment reminders. MSP invoices are often processed through corporate AP departments. Automated reminders keep them on track.
- Use Net 15 for retainers, Net 30 for hardware. Different payment terms for different line item types is common in IT services.
Frequently Asked Questions
Should MSPs bill per user or per device?
Per-user billing is increasingly standard because it simplifies pricing and accounts for multi-device usage (laptop + phone + tablet). Per-device billing works for specific scenarios like IoT devices, servers, or network equipment.
How do I handle clients who dispute out-of-scope charges?
Reference the SLA or managed services agreement that defines what’s included. If the work falls outside the defined scope, it’s correctly billed as out-of-scope. Provide the ticket documentation showing the request and your communication about the additional charge.
Should I charge tax on managed services?
It depends on your jurisdiction. In many US states, IT services are taxable while software licenses may be exempt (or vice versa). Hardware is almost always taxable. Consult with your accountant for your specific tax obligations.
What’s the best invoicing tool for MSPs?
For smaller MSPs (under 50 clients), DevInvoice handles recurring managed services billing, hardware line items, and Stripe payment collection efficiently. Larger MSPs may need PSA-integrated billing (ConnectWise, Datto Autotask).
