IT Support Invoice Template & Guide: Hourly, Retainers, and Tickets
IT support is really two businesses wearing one coat. There is the break-fix side, where something is broken and you fix it and bill for the time, and there is the managed side, where a client pays you a fixed monthly retainer to keep everything running so it never breaks in the first place. Most IT businesses do both, and the invoicing has to keep them clear: the retainer, the hours outside it, the hardware you pass on, and the software licences. Mix them up and the invoice confuses the client and undersells the value.
This guide covers how to invoice for IT support: hourly versus managed retainer versus per-ticket, remote versus onsite, hardware and licences, and a sample invoice you can copy. It works for solo IT consultants, computer repair techs, and small MSPs.
What an IT support invoice must include
An IT support invoice needs the standard fields plus a few specific to tech services:
- Your name or business name, contact, and tax number where registered
- The client's name and any PO reference for business clients
- A unique invoice number, issue date, and a clear due date
- The period or the ticket the work relates to
- The service: retainer, hours, or per-ticket, with a short description
- Hardware supplied, itemised
- Software licences or subscriptions passed on
- Subtotal, tax if registered, and the total due
Describing the work, not just "IT support, 4 hours", is what lets a client approve the invoice without a query. For the full anatomy of an invoice, see our invoice format and layout guide.
How IT support is billed
There are three main models, and most firms use a mix:
| Model | How it works | Best for |
|---|---|---|
| Hourly / break-fix | Bill time as issues come up | Ad-hoc work, new clients |
| Managed retainer | A fixed monthly fee for agreed cover | Ongoing, proactive support |
| Per-ticket / per-device | A set price per ticket or per device/month | Predictable, scalable support |
| Project | A fixed fee for a defined build or migration | One-off larger work |
Break-fix hourly is where most start, but the managed retainer is the goal: predictable income for you, predictable cost and less downtime for the client. Per-device pricing (a set fee per workstation or server per month) is how many MSPs scale. Whatever you use, name it clearly so the client sees what they are paying for. The retainer logic is the same as our consultant invoice guide.
Sample IT support invoice
Here is a managed retainer with some out-of-scope hours and a hardware item.
| Description | Qty | Rate | Amount |
|---|---|---|---|
| Managed IT support retainer (10 workstations) | 1 | $650.00 | $650.00 |
| Out-of-scope work: email migration | 3 | $95.00 | $285.00 |
| Replacement SSD (supplied + fitted) | 1 | $120.00 | $120.00 |
| Microsoft 365 Business licences | 10 | $12.50 | $125.00 |
| Subtotal | $1,180.00 | ||
| Tax | $0.00 | ||
| Total due (Net 14) | $1,180.00 |
The retainer, the out-of-scope hours, the hardware, and the licences each sit on their own line. The client sees exactly what the fixed fee covered and what was extra, which protects your retainer scope and keeps a recurring invoice approved without a query.
Remote vs onsite, and out-of-scope work
Two things need to be clear on an IT invoice:
- Remote vs onsite. Onsite work includes travel time and a call-out, so it often carries a higher rate or a visit fee. Remote work is quicker and cheaper. Show which is which, especially on hourly invoices.
- In-scope vs out-of-scope. The whole point of a retainer is a defined scope. When a client asks for something outside it (a migration, a new server, a project), bill it separately on a clear line, not silently absorbed. Absorbing out-of-scope work is the fastest way to make a managed client unprofitable, a theme in our common invoice mistakes guide.
Define the retainer scope in writing at the start, so both sides know what is included and what is extra.
Hardware and software licences
IT support often means buying kit and licences on the client's behalf, and how you handle them matters:
- Hardware: itemise each item, with a fair markup for sourcing, configuring, and supporting it. Show it separately from labour.
- Software licences and subscriptions (Microsoft 365, antivirus, backup): these often recur monthly or annually. Pass them on clearly, and decide whether you mark them up or pass at cost as a service.
- Recurring licences belong on the recurring invoice, itemised, so the client sees what they are subscribed to.
Keeping hardware and licences on their own lines makes the invoice transparent and your tax correct, since goods and services may be taxed differently. For recurring billing, see our how to set up recurring invoices guide.
Getting paid and tax
Business clients expect Net 14 or Net 30 terms and often use purchase orders, so put the PO number on the invoice or it may sit in a queue, as covered in our purchase order vs invoice guide. Tax depends on registration and location:
- In the UK, charge VAT (20%) once VAT registered.
- In Australia, register for GST (10%) at A$75,000 turnover and quote your ABN.
- In the USA, IT providers report income themselves; note that hardware is goods, which many states tax even where they do not tax the service.
Show hardware, licences, and labour on separate lines so tax applies correctly. For the mechanics, see our how to add tax to an invoice guide, and for cross-border clients our how to invoice international clients guide.
Common IT support invoice mistakes
- Absorbing out-of-scope work into the retainer.
- One vague line instead of a described service.
- Not separating hardware and licences from labour.
- Missing a PO number on a B2B invoice.
- Sending editable files. Always send a PDF.
Make an IT support invoice in 60 seconds
You do not need PSA software to invoice cleanly. Invoicara's free invoice generator lets you bill the retainer, add out-of-scope hours, itemise hardware and licences, apply tax to the right lines, add a PO reference, and export a clean PDF. Save your details so each month's invoice takes under a minute. No sign-up, no watermark, free forever.
For related professional services, see our consultant invoice guide and freelance developer invoice guide. For the basics, our complete guide on how to make an invoice covers every field. Name your billing model, itemise hardware and licences, bill out-of-scope work separately, and move clients onto retainers, and IT support becomes the steady, scalable business it should be.