> For the complete documentation index, see [llms.txt](https://docs.loopit.co/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.loopit.co/billing/setting-up-your-packages/packages/charge-types-and-models.md).

# Charge types and models

Loopit offers a comprehensive billing engine that allows you to control every aspect of your packages offered to customers.

### Billing models

#### **Once-Off**

A one-time charge applied per booking, regardless of the booking’s duration, program type, or whether it’s recurring.

* *Example:* An activation fee would be configured as a once-off charge since it should only be applied once.

#### **Ongoing**

A recurring charge applied based on the billing frequency and the duration of the booking.

* *Rental Example:* A daily rate configured as ongoing will multiply by the booking duration. For a 5-day booking, the charge applies 5 times.
* *Subscription Example:* A monthly subscription fee will be charged each month while the booking remains active.

### Pricing models

The pricing model defines how charges are calculated. Available options depend on the selected billing model.

If **Once-Off** is selected, only the **Flat Fee** pricing model is available.

For **Ongoing** charges, the following models are supported:

* **Flat Fee**
* **Unit Pricing**
* **Volume Pricing**

<table><thead><tr><th width="154">Model</th><th width="183">Supported package types</th><th>Description</th></tr></thead><tbody><tr><td>Flat fee</td><td><p></p><ul><li>Rental</li><li>Subscription</li></ul></td><td>A fixed charge applied per billing period or per booking.</td></tr><tr><td>Unit pricing</td><td><ul><li>Rental</li><li>Subscription</li></ul></td><td><p>Unit pricing applies charges based on specific billable metrics. </p><p></p><p><em>Example:</em> To charge for additional drivers, set up an ongoing billing model using Unit Pricing with the billable metric set to <strong>Drivers</strong>.</p></td></tr><tr><td>Volume pricing</td><td><ul><li>Rental</li></ul></td><td><p>Allows you to apply different rates based on booking duration, offering discounts or tiered pricing for longer bookings.</p><p></p><p><em>See the Volume Pricing configuration section below for details.</em></p></td></tr></tbody></table>

### **Volume Pricing**

**Volume pricing** allows you to apply different rates based on a billable metric such as duration, mileage, number of drivers and more.

<figure><img src="/files/si3Q4reJR7Ipbhq8xj2R" alt=""><figcaption></figcaption></figure>

#### How it Works

In the example above:

* For bookings **1 to 5 days**, the daily rate is **$100**.
* For bookings **6 to 10 days**, the daily rate is **$90**.
* For bookings **11 days or more**, the daily rate is **$80**.

*Note: If the “To” value is left blank, that tier will apply to any booking duration beyond the previous range.*

### Billable metrics

The **Billable Metric** determines which value is used to calculate the charge. This is required when using an ongoing billing model with either a unit-based or volume-based pricing structure.

Unit pricing - current options are Drivers.  Use this to control prices for additional drivers.

Volume pricing - current options are "Booking duration".  See volume pricing configuration above.

### Charge Types

Depending on your billing model, Loopit supports **up to three charge types**. Use them to bundle mandatory fees, offer optional extras, or apply one-off charges as needed.

<table><thead><tr><th width="155">Charge Type</th><th width="330">When It’s Used</th><th>Typical Examples</th></tr></thead><tbody><tr><td>Always</td><td>Automatically applied to every booking in the package.</td><td><ul><li>Base Rate</li><li>Joining Fee</li></ul></td></tr><tr><td>Add On</td><td>Optional extras customers can select during the booking flow.</td><td><ul><li>Child Seats</li><li>Additional Mileage</li><li>Insurance Excess Reduction</li></ul></td></tr><tr><td>Ad Hoc</td><td>Pre-defined charges staff can add during or after a booking.</td><td><ul><li>Smoking Penalty</li><li>Cleaning Fee</li><li>Refill Charge</li></ul></td></tr></tbody></table>