Can?? The borrower can do anything they want, right or wrong.
As I understand the interest deduction limitations, IRS requires that the deduction is only valid if paid by the taxpayer and the taxpayer must be liable for the interest. So, one borrower can claim it all, or they can split it if the payment and liability are split.
The 1098 is used to verify deductions. If the entire amount is not claimed by your named payor, it could trigger an audit question. Providing a copy of the 1098 and an explanation (i.e. deduction claimed by co-borrower, not by borrower, or deduction split between borrowers) should resolve the question, if asked. Read "providing" as provided by taxpayer(s), not by the lender.
The lender is only required to issue one 1098.
Al
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Al Miller, CRCM
Opinions expressed are my own and not necessarily shared by my employer.