The amount I held from a contractor is different on CIS return even though the bill shows the amount I have on the invoice. why would this change?

Hello jeans1,

There is something that we need to change on either of the contractor's transactions or on the CIS return. In this case, we recommend you reaching out to our support. They'll be able to see the discrepancy and help you fix it further. 

You can get our phone number in this link: https://quickbooks.intuit.com/uk/contact/.

Let us know if you have any questions. Thanks!