It may not make any change to your return. If you took the Standard Deduction for 2018, which was $18,000 filing as Head of Household, and you did not have enough to Itemize the amount you paid for sales tax is included in the $18,000 deduction you received.
If you did Itemize your deductions and you deducted the amount of State Income Tax you paid, you can only deduct State Income Tax or Sales Tax you paid, not both. You would need to see which one is greater.
If you want to include this information you will need to file an amended return for 2018, print, sign, date and mail it to the IRS and you state according to the instructions that print out with the return.
How to Amend Your Prior Years Tax Returns Using TurboTax
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