should i claim the amount of rent i paid on my house if I do business from home considering i already input the square footage part?

If you are claiming business use of home, the square footage is used to determine the percentage of the home used for business. When you enter your rent amount, you want to enter the full amount paid for the year. TurboTax will apply the percentage of business use to your home expenses to determine the amount you can deduct for business use of home.