You should check the box and explain the calculation or retain a copy of your calculation with your tax papers.
For instance, if you converted personal to rental on March 1, your expenses would be allocated 60/366 to personal and 306/366 to rental expenses.
1098 Box 1 $5,000
Personal on Schedule A $5,000 x 60/366 = $820
Rental on Schedule E $5,000 x 306/366 = 4,180
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