So if you use a whole room or part of a room for conducting your business you need to figure out the percentage.
Home office tax deduction mortgage interest. Generally when using the regular method deductions for a home office are based on the percentage of your home devoted to business use. These expenses may include mortgage interest insurance utilities repairs and depreciation. It shows where to deduct the part of your excess interest that is for those activities. To calculate the percentage of work space in the home expenses you can deduct use a reasonable basis such as the area of the work space divided by the total finished area including hallways bathrooms kitchens etc.
However you cannot deduct mortgage interest property taxes home insurance or capital cost allowance. Note that if you bought your home before december 16 2017 the deduction is limited to interest on mortgage debts below 1 million. My home office is only 8 2 of the whole home so i checked the box yes to have the rest of the mortgage interest deducted for the rest of the home. You can only claim the mortgage interest tax deduction if your mortgage is for a qualified home as defined by the irs.
As long as they qualify you can write off mortgage interest on both your main home and a second home as long as each home secures the mortgage debt. Mortgage interest irs publication 936 home mortgage interest deduction provides details on calculating this deduction. To calculate the percentage of work space in the home expenses you can deduct use a reasonable basis such as the area of the work space divided by the total finished area including hallways bathrooms kitchens etc. But if you write off 5 000 as a business expense and the remaining 15 000 in mortgage interest expense as a personal itemized deduction then your tax liability would be 28 574.
The tcja lowered this limit to 750 000 for mortgage debt taken out after december 15. I also originally added the 1098 mortgage interest property tax information in the personal deductions section. I originally entered my mortgage interest and property taxes in the business home office section. Because mortgage interest and real estate taxes are deductible without regard to the home office deduction the real advantage of the home office deduction for homeowners is that it converts an itemized deduction into a far more tax advantaged business expense deduction.
However you cannot deduct mortgage interest or capital cost allowance. First the mortgage interest deduction includes that which you paid on loans to buy a home on home equity lines of credit and on construction loans. But the tcja placed a significant restriction on home equity debt beginning with the 2018 tax year.