You probably do get taxed on it ( property tax? ). However I agree that taxing you on the “unrealized gains” from your home would be insane.

Think of how many seniors with a fixed income would be out on the street if this was to happen. Little old ladies in houses they bought decades before. Tax codes often defer even property taxes for seniors as they recognize that these people do not have actual “wealth” outside of these illiquid assets.

Of course, those houses will eventually be sold. If you want to collect more tax, increase the amount of tax you collect on those actual gains.