You do not have to make any adjustments to the home mortgage interest for the Delaware nonresident return. You can use the federal itemized deductions for the Delaware return.
Delaware nonresidents prepare a state tax return 'as if" they were residents, then apply the percentage of Delaware source income to the total tax calculated. As such, you can take any and all deductions allowed to a resident. Delware allows the same federal deductions so it does not matter where the home is located of you are deducting home mortgage interest.
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