Allocate all payments received in a given period to a CIS invoice. Do this before you run any reports or returns.
Payments included in the CIS 300 Monthly Return use the date of the payment. They don't use the date of the invoice.
For example, for an invoice dated 29/07/2020 and a payment dated 15/8/20, the allocation date is 15/8/20. It will appear when you run the report for August.
You can have multiple payments allocated to a single invoice. Your CIS reports show the payment date as the date of the latest transaction allocated.
For example: You have an invoice dated 31/7/20 and you allocate payments dated 10/8/20 and 10/9/20. The allocation date would be 10/9/20. The CIS values would appear in the September report.
They can appear on your reports as individual payments (one for each month). Allocate the two payments separately.
What to do when you will only receive a part payment for a CIS invoice and need to issue a credit note for the remainder.
For example: you have received a CIS invoice for £100 labour. With a CIS deduction rate of 30%, the amount due after the VAT reverses. CIS deducted is £70.
After a conversation with the subcontractor, you agree that the job didn’t take quite as long as originally thought. You settle on a revised figure of £50 for the labour. You pay the subcontractor the £50.
You record a £50 payment and match it to the invoice. You now need to issue a £20 credit note for the remaining balance.

When allocating a payment to an invoice, the payment splits equally across the:
We need to know the paid percentage of the original invoice.
To work out the net value of the credit note, calculate the amount outstanding as a percentage of the original invoice value. In our example we had an invoice of £70 of which we paid £50, so our credit note including the CIS deduction must equal £20.
To enter the net value correctly, We need to know the paid percentage of the original invoice.
£50 is 55.56% of £70 (50/70 x 100 = 71.43%)
Therefore, the remaining percentage to apply to the credit note’s net amount is 28.57%.
28.57% x £100 = £28.57.
In our example, the remaining amount for the credit note was £20. Here's how it would look:
