The duration you need to live in a house to avoid capital gains tax varies depending on your country’s tax laws. In many places, there’s a provision called the “primary residence exclusion” or “principal residence exemption,” which allows homeowners to exclude a certain amount of capital gains from taxation if they meet certain requirements.In the United States, for example, if you’ve owned and used the property as your primary residence for at least two of the past five years before selling it, you can exclude up to $250,000 of capital gains ($500,000 for married couples filing jointly) from taxation.However, these rules can differ in other countries, so it’s crucial to consult with a tax professional or accountant who is familiar with the specific tax laws in your jurisdiction. They can provide guidance on how long you need to live in a house to qualify for capital gains tax exclusions.