You don't specify whether the home office is in regards to being an employee, or your own business filing say a Sch C or Sch F.
For most people, the home office deduction was a miscellaneous itemized deduction subject to 2% of AGI. For 2018, those deductions went away. See the following link for instructions for Sch A.
chrome-extension://oemmndcbldboiebfnladdacbdfmadadm/https://www.irs.gov/pub/irs-pdf/i1040sca.pdf
If this is in regards to a business home office, such as a Sch C; here is a link to business deductions
https://www.irs.gov/forms-pubs/about-schedule-c-form-1040
**Disclaimer: Effort has been made to offer correct information; but due to the discussion forum limitations, the poster disclaims any legal responsibility for the accuracy of the poster's response**
