Contractor is pressuring me to make final payment.
Usually final payment is due upon receipt of invoice unless some other arrangement is made or understanding stated. For example, an invoice could say that payment is due 30 days from the date of invoice. Another example is if the invoice terms state 8/10 EOM, which means the customber gets an 8% discount if the invoice is paid by the end of the month, or by the 10th of the following month if the invoice is dated after the 20th day of the month. If paid after, the customer is not entitled to any discount. Also, if payment is not made when due, the contractor typically collects either a stated late fee or interest at a stated rate of interest, so long as it is a legal rate of interest.