A tax household refers to a group of individuals who are considered a single unit for the purpose of filing taxes. This can include married couples, domestic partners, and dependents who live together and share expenses. The members of a tax household are required to report their combined income and deductions on a single tax return, which can affect their overall tax liability. The concept of a tax household is important in determining eligibility for certain tax credits and deductions, as well as determining the tax filing status for each individual.