> ## Documentation Index
> Fetch the complete documentation index at: https://lago-ftr-wallet-improvements.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Overview

> If Billable metrics are made to measure customer usage, Plans are made to apply prices to this usage.

Note that you don't need to define a Billable metric to create a Plan. However,
if you have usage feature to charge, the price of your Billable metrics is
defined inside each Plan. Make sure to understand
[how to create a Billable metric](/guide/billable-metrics/create-billable-metrics) first.

## Plan structure[](#plan-structure "Direct link to heading")

A Plan defines the features your customers have access to, the prices paid to
access them and the invoicing cadence. In order to invoice a Customer with Lago,
you must assign a Plan to a customer.

**But first, let's define the structure of a Plan:**

<Tabs>
  <Tab title="Dashboard">
    1. [The Plan basic informations](#plan-structure)
       * A Plan `name`
       * A Plan `code`
       * A Plan `description`
    2. [The Plan model](/guide/plans/plan-model)
       * A Plan `interval`
       * A Plan base `amount` with the `currency`
       * Boolean to define if the Plan is paid **in advance** or **in arrears**
       * A Plan `trial period` in days
       * Taxes applied to this plan
    3. [The additional charges](/guide/plans/charges) for this Plan (any Billable metrics
       that have been created)
       * A Charge `model`
       * A Charge `amount` and its `currency` (automatically inherited from the
         currency of the Plan)
       * A Charge spending minimum
       * Boolean to define if the Charge is paid **in advance** or **in arrears**
       * Taxes applied to this charge (overriding the one defined on the plan)
  </Tab>

  <Tab title="API">
    <CodeGroup>
      ```bash Premium Plan Example
      LAGO_URL="https://api.getlago.com"
      API_KEY="__YOUR_API_KEY__"

      curl --location --request POST "$LAGO_URL/api/v1/plans" \
      --header "Authorization: Bearer $API_KEY" \
      --header 'Content-Type: application/json' \
      --data-raw '{
         "plan": {
            "name": "Premium",
            "code": "premium",
            "interval": "monthly",
            "description": "Premium plan for SMB customers",
            "amount_cents": 50000,
            "amount_currency": "USD",
            "trial_period": 3.0,
            "pay_in_advance": true,
            "bill_charges_monthly": true,
            "tax_codes": ["french_standard_vat"],
            "charges": [
               {
               "billable_metric_id": "__BILLABLE_METRIC_ID__",
               "charge_model": "graduated",
               "pay_in_advance": false,
               "invoiceable": true,
               "min_amount_cents": 0,
               "tax_codes": ["french_standard_vat"],
               "properties": {
                  "graduated_ranges": [
                     {
                        "to_value": 10,
                        "from_value": 0,
                        "flat_amount": "0",
                        "per_unit_amount": "0.001"
                     },
                     {
                        "to_value": null,
                        "from_value": 11,
                        "flat_amount": "0",
                        "per_unit_amount": "0.0005"
                     }
                  ]
               }
            }
            ]
         }
      }'
      ```
    </CodeGroup>
  </Tab>
</Tabs>

## Editing and deleting Plans[](#editing-and-deleting-plans "Direct link to heading")

Plans can be edited and deleted only if they are not linked to a Customer
(meaning there is no active [subscription](/guide/subscriptions/assign-plan) for this Plan).

If you want to make a change to a Plan already linked to a Customer, you have 2
options:

1. Remove all active subscriptions
2. Create a new Plan