Tax is the primary source of government revenue (state revenue), and compliance with tax laws is one of the requirements of tax policymaking and law enforcement. Household business (HKD) is a simple and popular business form in Vietnam. However, the business situation in this area is quite complicated, and the ability to comply with the tax law of the HKDs is not adequate. In Dak Lak province in 2021, tax compliance of HKDs is still not strict. Many HKDs are still late in paying taxes. The number of HKDs setting up tax administration under the presumptive tax method in 2021 increased by 9.096 households compared to 2020. However, tax revenues collected in 2021 decreased. This means that tax revenues collected from HKD are still not commensurate with the actual business level of HKDs. The results of Exploratory FactorAnalysis show that three factors affect the tax compliance of HKDs: the management capacity of the tax authority (CQT), tax administrative procedures, and the tax system. Therefore, the tax authorities must focus on promoting these factors to improve compliance with the tax laws of HKDs.