I already know I can claim my daughter and have paid almost all the expenses for my child. Now that my girlfriend and I live together (starting September last year) she covers more of the household expenses.
You may be able to file as head of household if you meet all the following requirements.
You are unmarried or considered unmarried on the last day of the year. See Marital Status , earlier, and Considered Unmarried , later.
You paid more than half the cost of keeping up a home for the year.
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. See Special rule for parent , later, under Qualifying Person.
For more information see IRS Publication 501: https://www.irs.gov/publications/p501#en_US_2018_publink1000220779
You may be able to file as head of household if you meet all the following requirements.
You are unmarried or considered unmarried on the last day of the year. See Marital Status , earlier, and Considered Unmarried , later.
You paid more than half the cost of keeping up a home for the year.
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. See Special rule for parent , later, under Qualifying Person.
For more information see IRS Publication 501: https://www.irs.gov/publications/p501#en_US_2018_publink1000220779