Your household size is essentially you and the number of people for whom you are financially responsible. Specifically, your household size is you plus the number of people that you claim as dependents on your tax return (or would claim as dependents if you were required to file a tax return). If you are claimed as a dependent on someone else's tax return, then your household size is that person and all their dependents, including you. You can learn more about calculating household size here.
What does household size mean?
