What deductions?
TurboTax starts off using the Standard deduction, so until your Itemized Deductions are higher than the Standard deduction your refund would not change. Or it will just change a little at a time as you increase your deductions over the standard amount.
And some deductions are limited like Medical and state taxes paid. Then If you are able to itemize you just get a percentage of your deductions back. Like if you are in the 25% tax bracket for a $100 deduction you will save $25. It isn't added on to your refund. Deductions reduce your income so you get taxed on a lower amount.
And that is just for the amount that puts you over the Standard Deduction. Now that the Standard Deduction is higher many people will be switching to the Standard Deduction. And there is a max 10,000 limit (5,000 MFS) of property tax and state taxes "SALT". And you can only deduct Medical that’s over 7.5% of your AGI.
For 2022 the standard deduction amounts are:
Single 12,950 + 1,750 or 65 and over or blind (14,700)
HOH 19,400 + 1,750 for 65 and over or blind
Joint 25,900 + 1,400 for each 65 and over or blind
Married filing Separate 12,950 + 1,400 for 65 and over or blind
