Probably the easiest way is to raise one invoice for the annual amount, then enter each payment in Sage (Bank\Customer) as it arrives. This saves raising loads of smaller, individual invoices. If your client takes the early payment discount, make sure you enter a credit note for this amount, so that you can match it with your annual invoice, before you process the payment(s.) Sage doesn't make it easy for you to process a credit/negative payment.
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