# Set up payment allocation

> [HTML Version](add-income-apps.html)

**Payment allocation **is an app in the system whose items you can use to schedule incoming payments. The [Receipts](income-widget.md) widget on an item page displays both estimated and received payments associated with that item.

By default, the [Deals](360012680899.md) app is set for payment allocation. When you finalize a deal, you can create an estimated incoming payment for it. It will appear on the deal's page, on the **Receipts** tab, and in the [Register of Incoming Payments](income-register.md) app.

## Set up an app for payment allocation

You configure payment allocation apps using the [Contract](contract.md) which can store items from different apps in a single interface. Apps added to the contract become [sources](add-contract-source.md).

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Only users of the [Administrators](360006871932.md#administrators) group can add source apps to the **Payment Allocation** contract.

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To add a new source to the **Payment Allocation** contract, follow these steps:

1. In the **Incoming Payments** workspace, go to the **Payment Allocation** app and click the gear icon to the right of its name.

2. From the menu, select **Source settings**. On the page that opens:

- Add any app in the system to the contract. To do this, click **Select App** and choose an app from the list.

**(add-income-apps-3.png)**

- Or [create a new app](360007235031.md), by clicking the **+ New App** button. It will be added to the **Incoming Payments** workspace and become a source. This app's fields will be similar to the [contract fields](set-up-contract-fields.md) and will automatically map to them. 

4. Map the fields of the existing app to the properties of the source app. To learn more, see [Add a source app](add-contract-source.md#add-source).

**(add-income-apps-4.png)**

5. Click **Select App**.

Linked apps will appear on the **Payment Allocation > Source Settings** page.

**(add-income-apps-5.png)**

You can add an unlimited number of sources to the contract.

Note that the source app's fields must match the contract's properties by [type](360009707032.md). If you didn't map all the fields when adding a source, or mapped some of them incorrectly, that source will be highlighted in red in the list of apps. To fix this, click the app in the list to return to the field-mapping window and check your settings.

6. Click **Save**.

The items from the added source app will now appear on the contract page. When you create items in the source, they will be automatically added to the contract.

## Remove a source

To unlink a source app from the contract, open the field-mapping window as described above and click **Delete**.

If you delete the app from the workspace where it was created, its items will no longer appear in the contract. However, all existing incoming payments created under the deleted basis will remain in the system.