# Manage fees in a fee model

Once you've created a fee model, you can:

* [Add a fee to a fee model](https://developers.pismo.io/pismo-docs/docs/add-a-fee-to-a-fee-model#add-a-fee-to-a-fee-model)
* [Edit the fees in a fee model](https://developers.pismo.io/pismo-docs/docs/add-a-fee-to-a-fee-model#edit-an-existing-fee)
* [Delete a fee from a fee model](https://developers.pismo.io/pismo-docs/docs/add-a-fee-to-a-fee-model#delete-a-fee)

Note that while you can delete fees from the fee model, you cannot delete the fee model itself.

# Add a fee to a fee model

To add a fee to a fee model:

1. From the main menu, select **Configurations** > **Fee models**.
2. Do one of the following:
   * To add a fee to the **default** fee model attached to the organization, select **Details**. Skip to step 4.
   * To add a fee to a different fee model, select the fee model in the results list.
3. On the **Fee model details** screen, open the **Fees** tab.
4. On the **Fees** tab, select **Add fee**.
5. On the **Fee description** screen, type a name for the fee in the **Name** field.
6. Select one of the following to specify whether the fee generates a transaction:
   * **Yes, it generates a transaction**
   * **No, it does not generate a transaction**
7. If the fee does generate a transaction, do the following:
   1. In the **ID** and **Type** fields, select the transaction ID to be used.
   2. In the **Calculation basis** field, select one of the following:
      * **Principal amount**—Taxes are applied to the original transaction amount only. This is the default.
      * **Contract amount**—Taxes are applied to the original transaction amount plus fees.
8. Select one of the following to specify the calculation method:
   * **Fixed**
   * **Greater**
   * **Percentage**
   * **Daily percentage**
   * **Compound interest**
   * **Accumulator**
   * **Price table**
   * **Aging**
   * **IOF**\
     For more information about calculation methods, refer to [Fee models](https://developers.pismo.io/pismo-docs/docs/fee-model#fee-models).
9. Select **Next**.
10. On the Processing code screen, choose the **Select** button for each processing code to which you want to link. For more information, see [Processing codes](https://developers.pismo.io/pismo-docs/docs/fee-model#processing-codes).
11. Select **Next**.
12. On the **Review** screen, select **Finish**.

# Edit an existing fee

To edit an existing fee in a fee model:

1. From the main menu, select **Configurations** > **Fee models**.
2. On the **Fee Model Details** screen, open the **Fees**tab.
3. Select the fee you want to edit.\
   The **Fee details** screen opens.
4. On the **Fee details** screen, edit the fields as needed and **Save** your changes.

# Delete a fee

> 📘
>
> You can delete the fees in a fee model, but you cannot delete the model itself.

To delete a fee from a fee model:

1. From the main menu, select **Configurations** > **Fee models**.
2. On the **Fee Model Details** screen, open the **Fees**tab.
3. On the **Fee details** screen, select the applicable **Delete fee** button, then select **Yes** in the confirmation dialog.