When a client pays a deposit, payment can be created and allocated to their account even before an invoice has been created. This amount can later be allocated to an invoice once the service has been rendered.
Go to Accounts > Payments
Clicking the 'New payment' button at the top of the page
Select the client for who made the deposit from the 'Client' search box
Now, complete the 'Payment date', 'Received amount' fields, and then select the 'Payment method' that the client used to pay you.
If the payment method you require does not exist you'll need to create it by adding a new payment method
Click '+ New payment method'
Select 'Other' as Payment type
Now, give the payment method a name. In this example, we've named the new payment method 'Deposit'
Make sure to now go back and complete the last step under 'Step 1: Create the payment' to complete creating the deposit payment
Once the client has an outstanding invoice,
Go to Accounts > Payments and open this payment again
Click the '+ Invoice' button and find the relevant invoice - select to allocate to invoice
OR
Via the client profile, navigate to the payment via the 'Accounts' tab in the client profile
Now, click the '+ Invoice' button and find the relevant invoice - select to allocate to invoice
Remember to click Save