Sales Tax Deductions

Regarding itemization and sales tax, I typically put a place holder estimating before I create my spreadsheet to get the accurate total before filing my taxes.  Once I was complete with my spreadsheet (inputting one receipt at a time), I was well under my estimate mainly because I purchased a new car and other items.... Christmas etc..   In the past my refund would go up or down depending on the amount inputted regardless if I took TurboTax's estimate. This year the amount did not change.... regardless of what number I used.  

 

Is sales tax capped based on AGI? Why would the total refund not adjust with different sales tax amounts?  I even continued the process of filing my taxes and still no change thinking it would update at the end.  

 

I would hate to lose itemizing a few thousand dollars of sales tax.  I live in Texas. 6.25%

 

Thanks in advance! Mark