Is the Sales Tax Deduction Calculator Working? I paid a ton of sales tax due to a major remodel. The amount of sales tax I paid exceeds what I paid in State Taxes (approximately $20,000). No matter what amount I enter, the amount of state tax I owe does not change. I checked the box "use sales tax" and "change my deduction", but the amount I owe still doesn't change. Also, I have not paid and I do not owe AMT. Is anyone having the same problem?