Unpaid Invoice - What do I do next?

Hello William
Compensation is a one off claim. Interest is calculated on a daily basis so the longer your claim is unpaid, the more it will cost the debtor.
When you give up and go through the small claims is when you feel you have done all you can.
The late payment users guide has plenty of helpful information.

I hope that helps

David

I don't think there are any hard and fast rules when you should chase but if you send a claim for interest and compensation, then a follow up a week later with revised interest and they do not respond, I personally would send a third follow up with latest interest amounts and a letter before action to let them know you are no longer prepared to wait. Particularly if there is no dispute with your claim.

Has the customer said why they have not paid you? Do they have the means to pay you if it is such a long period? Might be an idea to try and talk to the purchaser to get a reason.

Regards

David