There is no such thing as a sales tax deduction for "major purchases" and if the program uses those words, it's wrong. If you use the standard deduction method (based on your income and location), you can add extra taxers paid for purchase of a motor vehicle, airplane, home, or major renovation to a home.
However, if the sales tax on items included in the major renovation is not charged at the same general sales tax for other items in your location, you can't use the standard method. You can only use the exact method, where you claim your exact sales tax that you can prove from receipts.
