Deductions & credits
The information box in TurboTax will show the detailed allowable contributions (see image below). It's unusual for a 30% or 20% limit to be considered.
You can also use the IRS Publication 526 and the IRS tool for searching their list.
The amount you can deduct for charitable contributions is generally limited to no more than 60% of your adjusted gross income (AGI). Your deduction may be further limited to 50%, 30%, or 20% of your AGI, depending on the type of property you give and the type of organization you give it to. A higher limit applies to certain qualified conservation contributions and qualified cash contributions for 2021.
