Mortgage Interest Credit Certificate Trying To Claim Mortgage Interest Credit On 1040, But How Do I Find Out My MORTGAGE CREDIT CERTIFICATE NUMBER?

Trying to claim mortgage interest credit on 1040, but how do I find out my MORTGAGE CREDIT CERTIFICATE NUMBER? - mortgage interest credit certificate

I do not know where my certificate. Last year, the IRS does not require the certificate number, and who has them as well. This year it is. I called the bank that issued my mortgage. They said they can not tell me where to find the license number. How do I know my license number and the mortgage was granted.