What is a Minimum Invoice?
Written by Arnon Shimoni
✓ Expert
Last updated on:
A minimum invoice is a floor on what a customer is billed per period, regardless of what they actually used. If the contract says €2,000 a month minimum and the metered usage comes to €1,340, the invoice is for €2,000. If usage comes to €2,600, the invoice is for €2,600.
It solves a problem specific to usage-based pricing: the vendor carries fixed costs for every customer, from onboarding to support to infrastructure reserved for them, and pure pay-as-you-go lets a customer sit on the platform generating almost nothing. The minimum turns that into a predictable baseline without giving up the upside when usage grows.
At a glance | Minimum invoice |
|---|---|
What it is | A minimum billable amount per billing period on a usage-based contract |
How it appears | Either a top-up line ("minimum commitment adjustment") or the invoice total raised to the floor |
Where the floor is set | On the whole invoice, on one product, on a group of products, or on a single metered item |
Related concepts | Minimum commit, prepaid credits, platform fee, included volume |
Legal side | No VAT-specific rules. The top-up is a taxable supply at the same rate as the service |
Not to be confused with | A minimum order value or a "we don't invoice under €X" threshold in retail |
How a minimum invoice works
At the end of each billing period the billing system rates the customer's usage as normal, then compares the result to the floor.
Usage is metered and rated: 1,340,000 API calls at €0.001 is €1,340.
The contract minimum is €2,000 per month.
The shortfall is €660. It's added to the invoice as a separate line, usually described as a minimum commitment adjustment, or the usage line is shown with the total lifted to €2,000.
If usage had been €2,600, no adjustment appears and the invoice is €2,600.
The separate line is the better presentation. The customer can see exactly how far below the floor they were, which is the information they need to decide whether to use more or renegotiate.
Where the floor can sit
A minimum doesn't have to apply to the whole invoice. Four levels are common:
Level | Example | When to use it |
|---|---|---|
Invoice total | At least €5,000 per month across everything | Simple enterprise contracts with one overall commitment |
Product total | At least €2,000 on the API product, no minimum on storage | When one product carries your fixed cost and others are incidental |
Group of products | At least €3,000 across compute and inference combined | When products substitute for each other and you don't care which the customer uses |
Single metered item or volume | At least 1 million tokens per month | When the commitment is naturally expressed in units rather than money |
Minimum invoice vs minimum commit vs platform fee
Three mechanisms give the vendor a baseline. They look similar on a term sheet and behave differently on an invoice.
Minimum invoice is a per-period floor. Nothing carries over. Pay €2,000 for €1,340 of usage in March and April starts from zero.
Minimum commit is usually a contract-term commitment, €24,000 over the year, that can be drawn down unevenly. Some months are below €2,000, some above, and there's a true-up at the end if the total falls short. The per-period floor is a special case of this with a one-month term.
Platform fee is a fixed charge for access that usage is billed on top of. It's not a floor: a customer pays the fee and their usage. The hybrid model of fee plus usage is often simpler to explain than a minimum, but it doesn't let usage "eat" the fixed element.
Prepaid credits achieve a similar economic result by collecting the money up front and drawing it down. The vendor's cash arrives earlier; the customer's unused balance is the shortfall.
What to decide in the contract
Does the floor include or exclude discounts? If a customer has a 20% volume discount, is the minimum tested against the discounted or list amount? Say which.
Does the floor include one-off charges? Implementation fees and overages usually sit outside it.
Does the floor apply from day one? A ramp, with no or lower minimums in the first months, is normal for new customers.
Does the floor apply to partial periods? If the contract starts on the 20th, prorate the minimum or waive it for the stub period. Decide before the first invoice.
What happens to the shortfall? On a strict minimum invoice, nothing. If you let it carry forward as credit, you've built a minimum commit instead, and your revenue recognition changes with it.
Where Solvimon fits
Minimums are a native part of a Solvimon subscription. A minimum usage commitment is configured on the subscription schedule at the invoice total, product total, combined products, product item or item volume level, with its own start and end dates so ramps and stub periods are handled explicitly. It sits alongside discounts, included volume and markups on the same schedule, and the shortfall appears on the invoice as its own line, so the customer sees the gap and your revenue team sees the commitment being honoured. If your minimums currently live in a contract PDF and a spreadsheet rather than in the billing system, talk to one of our experts.
FAQ
Is a minimum invoice the same as a minimum order value?
No. A minimum order value is a retail or wholesale rule that you won't accept orders below a certain size. A minimum invoice is a contractual floor on recurring usage billing.
Does the shortfall carry over to the next period?
On a minimum invoice, no. If it does, you have a minimum commit with a drawdown balance, which is a different mechanism with different accounting.
How is the top-up taxed?
As part of the same supply, at the same VAT rate. There is no special treatment.
Can I apply a minimum to a single product only?
Yes. Product-level and item-level minimums are common when one product carries the fixed cost.
Should the minimum be a separate invoice line?
Yes. Customers accept a clearly labelled "minimum commitment adjustment" far more readily than a usage line whose maths doesn't add up.
This page was last reviewed in October 2026.
Related
Minimum commit. The contract-term version with drawdown.
Usage-based pricing. The model that creates the need for a floor.
Hybrid pricing models. Fee plus usage as the alternative.
Overage charges. The ceiling-side counterpart.
EU invoice requirements. What the invoice carrying the minimum must contain.
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