In this example, we will use the deposits functionality to invoice for half of an available amount, with the rest to be invoiced at a later date. The example here would be invoicing 50% at start and the remainder on completion.
In this example, we already have the full amount invoiceable.
We begin by creating the deposit for half that amount, or GBP 4,875. This will bring the total invoiceable up accordingly, as the full amount and deposit are now both invoiceable.
On the deposits screen, you will see that the deposit is marked "Ready for Invoicing"
The next step is to create the invoice solely against the deposit. Make sure to leave the 9,750 value unchecked. No larger number is required here, this works just as well when the deposit is the only item available for invoicing.
After we have dispatched that invoice, the invoiceable amount will fall to half the original value. This is because it is now returning the original amount, less the amount of deposit invoiced as an advance (9750 - 4875 = 4875).
When everything is complete and you're ready to invoice for the second half of the revenue, you will create a new invoice against the original items and the negative deposit invoiceable item. This can be seen in the screenshot below. It's important to select both, or the large amount will not draw down from the deposit.
The resulting invoice will be for the remaining half of the project, while the original deposit invoice represented the first half.
Feel free to comment below with any questions or concerns.