I think this is what you are looking for.

If the invoice is over 30 days old, calculate 1.5% interest on the invoice
amount, otherwise the interest is -0-.

=IF(F10-A1430,F14*.015,0)




"Nat that stuck" <Nat that wrote in message
...
Hi!

I am trying to calculate the interest owned by a client. I need to do
this
using dates as the terms of sales a 1.5% after 30 days. My
spreadsheet
is set-up as follows: in F10 Current date, in A14 Invoice date, in F14
amount of sale and the amount is to be in F18. So the invoice date is
July
14, 2005 and the amount is $428.00. Can someone please help me?!?! I"ve
been working on this for over 3 hours and I cannot seem to get the proper
answer.
Thanks in advance.