Here are the requirements for Head of Household. They have not changed between 2017 and 2018.
You may be able to file as head of household if you meet all the following requirements.
1. You are unmarried or considered unmarried on the last day of the year.
2. You paid more than half the cost of keeping up a home for the year.
3. A qualifying person lived with you in the home for more than half the year (except for temporary absences, such as school). However, if the qualifying person is your dependent parent, he or she doesn't have to live with you.
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