Hi,
I have client who will pay about from now 100 PLN every month until February 2016.
He want to get one invoice in February 2016 for all payment that he made from the begining
(money will come for my account regulary every month)
From the invoicing point of view, it would make sense to either raise a single invoice with the date of Feb 16 and then use bank tagging in the normal way to allocate payments from them to the invoice each time they are imported. Alternatively, you could just have the bank tagging create an invoice for the payment each time.
However, the fact you are being paid in foreign currency might complicate things. Do you have your bank account in GBP or PLN? If your account is in GBP that would mean you don’t know the exact amount I guess as the exchange rate varies? You could still use either method for the invoice as above but for the single invoice just put a guesstimate amount in and once all the payments are received you can tweak the amount to match the paid amount.
Just to add another angle - if you’re VAT registered… that may throw a new twist to the matter as a payment can create a tax point. Cleanest way is to raise an invoice for each payment amount.