You can deduct interest on acquisition debt. Acquisition debt is debt that was incurred to buy, build, or substantially improve your home.
So one issue is, are new doors a "substantial improvement." Here is the IRS instruction.
Substantial improvement.
An improvement is substantial if it:
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Adds to the value of your home,
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Prolongs your home's useful life, or
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Adapts your home to new uses.
Repairs that maintain your home in good condition, such as repainting your home, aren't substantial improvements. However, if you paint your home as part of a renovation that substantially improves your qualified home, you can include the painting costs in the cost of the improvements.
The second issue is timing. Generally speaking, you can count expenses you paid before the loan came through if the loan is "made" (approved and paid out) within 90 days after the completion of the work. If the loan was applied for before the end of 90 days but not approved until after the 90 days, it will usually be acceptable if audited.
