Money transferred from January to December of the previous year is subject to withholding tax,so it will be the sales from December two years previously up to November of the previous year that this applies to.
Affiliate rewards are not subject to withholding tax.
The "Payment Value" noted on the Payment Recordis not the total of the transferred funds,but the value of monthly sales minus affiliate rewards.
Please note that the carry-forward balance amount from before December two years previously may slightly differ.