[GNC] Adding late charges to a vendor bill after posting?

[Eric H. Bowen]

Property taxes are due. Actually, by the time you read this, they will 
be past due... I used the "vendor bill" Payables system to track this 
when I got the tax bill in November and I've made a partial payment, but 
the funds just are not there to choke down the whole thing. So I'm going 
to get gigged for a late fee, and possibly even more if I can't settle 
up by the end of February.

What's the proper way to track this? If it gets to the point where I 
need to make a monthly payment arrangement (basically a 12 month note) I 
was going to enter the note as a new liability and credit that towards 
the tax payment due. But if I can get this cleared up by late February 
or mid-March then I'll just have a month or two of late fees/interest 
due. Is there a way to associate that with the tax payment after the 
bill has been posted? How should it properly be handled?

Asking for a friend....