I only own the one loan. I'm trying to understand what would have limited the deduction, and why turbo tax is showing a different value online than what was actually entered in the form.
Here is the list of requirements for deducting the mortgage interest. You may have answered one of the questions differently than expected or forgot to answer a question or may have not entered every line item from your 1098. You should carefully review your answers in that entire section as it does sound like you qualify to deduct all of your interest.
The IRS lets you deduct your mortgage interest, but only if you itemize deductions. You can't deduct the principal (the borrowed money you're paying back).
In addition to itemizing, these conditions must be met for mortgage interest to be deductible:
For tax years 2018 through 2025, you can only deduct the interest from the amount of your loan that was used to buy, build, or improve the home that it’s secured by. If you’ve ever used part of this loan to pay for things other than this home, you cannot deduct the interest from that amount of the loan, even if the transaction didn’t take place this year.
Don’t worry, we’ll help figure out what amount of interest you can deduct.
Examples of common ways you might have used this money, not on your home include: