Being able to mark a invoice as bad debt
When you have a client that does not pay you need to be able to mark the invoice as bad debt so that the invoice can be closer but accountants can see and tell that the invoice is a bad debt. This will help for tax time as this is a write off. But not being able to mark the invoice makes it extremely hard for accountants to know what's going on with the invoice. Many other CRM's have this functionality. This would be a great feature and I'm sure many will agree.