both parents live together but are not married. We have 4 dependents. One parent is using 3 dependents and the other parent os using 1 dependent. Can we both use head of household?
Only one person is able to claim HOH. There are a few requirements you must meet to be able to claim this Filing status you can read about those on the IRS link scroll to page 8. https://www.irs.gov/pub/irs-pdf/p501.pdf The IRS also has a great interactive tool to help determine your filing status. https://www.irs.gov/help/ita/what-is-my-filing-status