On the Mortgage Credit deduction page, there is a box called Credit rate and it is asking for a percentage. Where is this found? My Credit Union has no clue what it is.

This should be on the mortgage credit certificate (MCC) from your state or local government you received at the time of purchase. These certificates are issued as part of state and local government programs to help (lower income) people buy a home.

The mortgage credit certificate (MCC) shows the credit rate that applies to you. The government agency who issues your MCC determines this credit rate.
 

This may not apply to you. If you are not sure your mortgage provider should be able to tell you if a Mortgage Credit Certificate applies to your mortgage loan.