Make sure you are not using the "simplified method" for home office deduction. Then, check your answers in the Home Office section of your self-employment income.
You can click the "magnifying glass Search" icon on the top row, enter "home office" in the search window and press return or enter, and then click on the "Jump to home office" link to check your entries in the Home Office section.
Note that your home office expenses (including property taxes and mortgage interest) show up as a lump sum on Line 30 of Schedule C. Form 8829 will have the detail, including your real estate taxes and deductible mortgage interest.
**Mark the post that answers your question by clicking on "Mark as Best Answer"
If you use the standard deduction you won't use schedule A but you can still claim property taxes on Form 8829 , Expenses for Business Use of Your Home.
Taxpayers claiming the standard deduction.
If you claim the standard deduction, you will not include any mortgage interest, mortgage insurance premiums, or real estate taxes on lines 10 and 11; instead, you will claim the entire business use of the home portion of those expenses using lines 16 and 17.
Form 8829 is available. In TurboTax Online, search for 8829 on the Federal tab, and Jump to Form 8829.
In TurboTax Desktop CD/Download, make sure that you have updated your software to the latest release.
Click on Online at the top of the desktop program screen. Click on Check for Updates.
Go to Forms. When in Forms mode click on Open Form at the top left of the screen. Type in 8829. Click on the result to open the form.