You can deduct all of your out of pocket expenses as cash contributions as well as 14 cents per mile for travelling by auto in the service of your qualified volunteer organization.
To report volunteer expenses in TurboTax:
To enter volunteer contributions:
Type in charitable contributions. in the search box, top right of your screen, then click the magnifying glass
Click the jump to charitable contributions link in the search results.
Follow the onscreen instructions to enter
-
To benefit from the above, you must itemize your deductions.
Unless you have enough itemized deductions (ie. Medical mortgage interest, property taxes, charitable giving, ect) to exceed your Standard Deduction, you will not be able to benefit from this expense.
See https://ttlc.intuit.com/questions/2902084-is-volunteer-work-deductible