Usage billing and one-off charges

Charge for what a customer used during the period, add one-off charges to a subscription, and see what the next invoice will be.

Usage-based add-ons

Some things are charged by how much the customer used: messages sent, hours of support, units delivered. Make them as add-ons charged By usage.

1. Go to Catalogue › Add-ons and click New add-on.
2. Under Charged, choose By usage (billed after use).
3. Set the price per unit used. Volume, tiered and package pricing work too, for example the first 100 units at one price and the rest cheaper.
4. Add the add-on to a subscription, on the subscription form or with Change plan.

Usage billing is in the Standard plan and above.

Record usage

Open the subscription and click Record usage. Choose the add-on, the date and the quantity used, and add a note if you like.

• Each invoice bills the usage dated before it: the usage of the period that just ended. Each add-on's usage comes as one line, for example Usage 01-10-2026 to 31-10-2026: 1,250.
• The Usage card on the subscription shows what is not billed yet, and which invoice each record went on.
• To correct a mistake not billed yet, remove the record, or enter a minus quantity.
• When a subscription is cancelled now, or ends at the end of its term, a last invoice bills the usage and charges not billed yet.

Usage doesn't count in monthly recurring revenue (MRR), because it changes each period.

One-off charges

To charge something once, such as an extra training session or a replacement part, open the subscription and click Add a charge.

1. Choose the item. Its tax rate and HSN / SAC go on the invoice.
2. Change the name on the invoice, add a description, and enter the quantity and price.
3. Choose Invoice it now for an invoice today, or Add it to the next invoice to bill it with the next renewal.

Charges waiting for the next invoice are listed under On the next invoice on the subscription. Click x to take one off.

Preview the next invoice

On the subscription, click Preview next to Next invoice. You see the lines, tax and total as things stand now: the plan and add-ons, any change waiting for the renewal, the usage recorded so far, and charges waiting for it. Nothing is saved.

Renewing on a fixed day

With calendar billing on (Settings › Billing preferences), monthly subscriptions renew on the same day of the month. See Billing preferences.