Many married people file their taxes as Head of Household in order to save money, not realizing that there are very strict requirments for such a status. In order for you to qualify as “considered unmarried” you must meet the following criteria taken directly from the IRS website:
To qualify for head of household status, you must be either unmarried or considered unmarried on the last day of the year. You are considered unmarried on the last day of the tax year if you meet all the following tests.
Source: https://www.irs.gov/publications/p501#en_US_2018_publink1000220775Business Law