# How are Volume Usage Rates Calculated?

impact.com uses Payment Processing Volume (PPV) as a metric to measure the number of payments that we process for your program. When your processed volume exceeds your purchased PPV tier, we may assess Incremental Volume Fees (or Overage Fees).

#### The short version

* impact.com keeps a running tally of the actual PPV we process for your program(s) each month.
* At the end of the month, impact.com compares your actual PPV to your purchased PPV tier.
* If the actual PPV for your program(s) exceeds your allotted PPV, we’ll calculate an Incremental Growth Fee.

#### Incremental Growth Fee calculation

impact.com uses the following primary factors when calculating an incremental growth fee:

|                                                                       |                         |
| --------------------------------------------------------------------- | ----------------------- |
| Your actual PPV value for an applicable period                        | `ACTUAL`                |
| Purchased PPV for an applicable period                                | `PURCH`                 |
| Percentage to be applied to PPV that exceeds the Purchased PPV volume | `PERC`                  |
| Incremental Growth Fee                                                | `(ACTUAL - PURCH) PERC` |

{% hint style="info" %}
**Example:** For a standard monthly payment processing volume, Incremental Growth Fees are calculated as follows: 15.4% of the additional Monthly Payment Processing Volume (e.g., additional Payment Processing incremental volume of `$10,000 x 0.154 = $1,540`).

Let’s say you have a standard tier of Monthly Payment Processing Volume of $17,500. Within a given month, we tally up that we’ve processed $20,000 worth of payments for your account.

The incremental growth fee is calculated as such `($20,000 - $17,500) x 15.4% = $385`.

This amount will be added as an additional line item on the next invoice.
{% endhint %}

#### Types of payments

The term Payment Processing Volume (PPV) includes all processing volume for the following transactions processed through impact.com:

| Type of payment                                                                                                                                                                | Description                                                                                                                                                                                           |
| ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| Action costs                                                                                                                                                                   | Costs associated with paying for actions; namely commissions.                                                                                                                                         |
| [Performance bonuses](https://help.impact.com/brand/what-would-you-like-to-learn-about/platform-features/contracts-and-template-terms/performance-bonus/performance-bonus-faq) | Additional performance bonuses paid in addition to commissions.                                                                                                                                       |
| Minimum EPC costs                                                                                                                                                              | Costs associated with minimum earnings per clicks (EPC).                                                                                                                                              |
| Slotting fees                                                                                                                                                                  | Costs associated with partners that charge slotting or placement fees. These costs are trailing monthly charges pro-rated to the exact number of days a contract was active within the billing cycle. |
| [Partner Funds Transfers](https://help.impact.com/brand/what-would-you-like-to-learn-about/platform-features/finance/partner-funds-transfer/transfer-funds-to-a-partner)       | Funds that are transferred to partner(s).                                                                                                                                                             |

#### Where can I find my usage fees?

* Run the *Usage Volume by Status and Transaction Type* [report](https://help.impact.com/brand/what-would-you-like-to-learn-about/platform-features/finance/your-subscription/view-your-usage-volume-by-status-and-transaction-type).
* View your [*Plan Usage*](https://help.impact.com/brand/what-would-you-like-to-learn-about/platform-features/finance/view-your-impactcom-subscription-and-usage-details#view-your-usage-details-0-2) details on the *Subscriptions* screen.