You can edit all bills, even those that have already been paid.
Use these steps to change the amount due on a bill. To change the
amount you paid on a bill, see
Edit bill payments.
What's happening behind the scenes?
If you reduce the bill amount, QuickBooks creates a credit with the vendor
who you overpaid. If you increase the bill amount, QuickBooks considers the
bill not fully paid until you pay the additional amount.
To do this task
Find the bill.
Click the Vendors icon.
If you know the vendor's name, select the vendor on the
Vendors tab, then click the Show
drop-down list and choose Bills.
Otherwise, click Bills on the Transactions tab
to get a list of bills for all vendors.
(Optional) Use the Filter By and
Date drop-down lists to narrow down the set of bills displayed.
Double-click the bill to open it.
Make the necessary changes to the bill.
Save the bill.
payment terms with a vendor
discount you've already applied to a bill payment
Change a credit
you've already applied to a bill payment