SaaS Invoice Template
SaaS billing breaks a plain invoice: you have recurring subscription fees, per-seat counts that change mid-cycle, and proration credits. This template models the billing period, seat count and any proration as explicit lines so finance teams can approve it without questions.
Last reviewed 2026-07-01
Template preview
- From:
- Acme Cloud Inc. · billing@acme.io
- Bill to:
- Client Co · ap@client.com
- Invoice #:
- INV-2026-114
- Billing period:
- Jul 1 – Jul 31, 2026
- Due date:
- Auto-charged Jul 1 (Net 0)
| Description | Qty (seats) | Unit / mo | Amount |
|---|---|---|---|
| Pro plan — monthly subscription | 20 | $29.00 | $580.00 |
| Additional seats added Jul 12 (prorated) | 5 | $18.70 | $93.50 |
| Annual support add-on | 1 | $99.00 | $99.00 |
| Subtotal | $772.50 | ||
| Sales tax (varies by region) | $61.80 | ||
| Total charged | $834.30 | ||
How to fill in each field
Billing period
State the exact start/end dates of the cycle, not just the invoice date.
Common mistake: Showing only an issue date, which makes proration and refunds impossible to audit.
Seat quantity
List the seat count that was active during the period; break out mid-cycle additions.
Common mistake: Charging end-of-period seat count for the whole month instead of prorating.
Proration line
Show prorated additions/removals as their own line with the prorated unit price.
Common mistake: Silently adjusting the subtotal — customers dispute charges they can't see itemized.
Auto-charge note
If billed to a card on file, say so and note Net 0 / auto-charge date.
Common mistake: Sending a Net 30 due date on an invoice that was already auto-charged.
Related templates & variants
This is the SaaS-specific variant of our main invoice. For hourly work see the freelance version; for retainers and pass-through expenses see the consulting version.
Download a professional invoice template in Word, Excel, CSV or Google Docs. Includes a field-by-field guide, tax-line examples and common billing mistakes to avoid.
A freelance invoice template for hourly and fixed-project work. Track billable hours, rates and deposits. Download in Word or Excel with a field-by-field guide.
A consulting invoice template with monthly retainer, day-rate work and reimbursable expenses. Download in Word or Excel with a guide to billing clients cleanly.
Recommended tools
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Frequently asked questions
How do I show proration on a SaaS invoice?+
Add a dedicated line for the mid-cycle change with the prorated unit price and the number of seats affected, so the partial charge is transparent.
Should a SaaS invoice show MRR?+
The invoice should show what was charged for the period. MRR is an internal metric — keep it in your billing system, not on the customer-facing invoice.
Net 30 or auto-charge for SaaS?+
Self-serve SaaS is usually auto-charged (Net 0). Enterprise contracts often use Net 30 with a PO number — match the invoice terms to the contract.
How do I invoice for annual vs monthly SaaS plans?+
Annual plans are typically billed once upfront for the 12-month term (state the coverage period on the invoice); monthly plans bill each cycle. If a customer switches mid-term, show the change as a prorated credit or charge on its own line.
Sources & further reading
- SaaS billing 101: what businesses need to know (Stripe)— stripe.com
- Billing software for SaaS companies (NetSuite)— netsuite.com
- SaaS billing best practices (BillingPlatform)— billingplatform.com
We review authoritative guidance when building each template. Links are for reference only.