Create add-ons

Add-ons represent fixed fees that are not based on usage. Once created, they can be:

Added to a plan as a fixed charge, or
Applied directly to a customer through a one-off invoice

An add-on can carry its own taxes. When it does, these taxes apply to the add-on fee instead of the taxes of the customer or of the billing entity.

Dashboard
API

Open the Add-ons section from the side menu
Click Create an add-on
Enter a name, code, and optional description
Define the default amount and currency (these values can be overridden when issuing an invoice)
Click Add add-on to confirm

LAGO_URL="https://api.getlago.com"
API_KEY="__YOUR_API_KEY__"

curl --location --request POST "$LAGO_URL/api/v1/add_ons" \
  --header "Authorization: Bearer $API_KEY" \
  --header 'Content-Type: application/json' \
  --data-raw '{
    "add_on": {
      "name": "Setup Fee",
      "code": "setup_fee",
      "amount_cents": 50000,
      "amount_currency": "USD",
      "description": "Charge a setup fee for new customers.",
      "tax_codes": ["french_standard_vat"]
    }
  }'

Manage add-ons

From the Add-ons section, you can edit or delete existing add-ons using the ellipsis menu.

Editing lets you update the name, code, description, and default values.
Deleting removes the add-on and the fixed charges that use it from your plans (this action cannot be undone). Invoices already issued are unchanged.

Introduction

Get started

Events & Usage Components

Pricing & Subscriptions

Quotes & Order Forms

Invoicing

Payments & Cash Collection

AI Agents and MCP

Data & Analytics

Revenue recognition

Resources

Create add-ons

Manage add-ons