Taxed at your ordinary income rate, which varies person by person, based on other income, deductions, dependents, losses, State rate, city rate, etc., etc. and of course on the value of the house.
They are added to your regular income, so genraally if small might not change tax bracket; but it might if large. So impossible to be precise. Check tax table. IRS.gov; i guess. ans. How much you pay...
This depends on what country and what state you are in. In the United States it is A LOT! In Australia, you pay no taxes on lottery winnings. NOTHING! If you post a question with your specific...
Other than the deductability of property taxes and such, and the tremendous breaks on gains upon sale, you don't get anyspecial dedcutions for owning a property.