If your fiance is a W-2 employee he cannot take a deduction for the use of his truck nor can he take a deduction for a home office. If he has a mortgage and itemizes deductions on Schedule A (as opposed to taking the Standard Deduction) he can deduct his mortgage interest and property tax. In order to receive any benefit, his itemized deductions would have to be more than the Standard Deduction ($12,200 for filing Single in 2019).
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