Household type for Korea's income tax credits hinges on spouse, qualifying children, and lineal ascendants โ not your address
It's easy to assume that living alone makes you a single household, or that an unemployed spouse makes you single-income โ but household type for these tax credits isn't determined by your resident registration alone. It depends on whether a spouse, qualifying children, or a qualifying lineal ascendant actually exist and what income they have, and the spouse's total wage income specifically is what separates single-income from dual-income status.
This list walks through the judgment calls that most often get confused between single and single-income households, in order. This guidance reflects the 2025โ2026 rules and specific requirements may change, so for any ambiguous family or property situation, it's best to confirm through Korea's National Tax Service Hometax portal or an official consultation with your local tax office rather than relying on any single online example.
