You can deduct sales tax on the ring if you use the exact amount method. You may deduct the exact amount of sales tax you paid during the year and that you can prove with your receipts or records. If you use the standard amount method, which assigns a standard sales tax deduction based on your income, then the only thing you can add to it is, as described by others, a motor vehicle, airplane, or your home or substantial renovation to your home. The ability to add “major purchases“ is an unfortunate misnomer.
