@JoannaB2 I believe you acknowledged that you gave incorrect information in this thread.
https://ttlc.intuit.com/community/tax-credits-deductions/discussion/re-turbotax-is-incorrectly-combi...
You claimed it was a typo. But you are giving the wrong information again. Please stop copy and pasting incorrect information.
Single people don't have a lower mortgage threshold. Single filers and married filing jointly is $750,000. It's married filing separately that have the $375,000 limit.
