There is no offset of the IRA distribution for tax purposes . The IRA distribution is fully taxable. The educational IRA exception refers only to the 10% early (before age 59.5) distribution penalty.
However, this is a case where some "double dipping" is allowed. You may claim an exception for the 10% penalty on the $25,000 that was used for education. You can also claim the same $25,000 of educational expenses for the 529 plan exclusion.
From IRS Publication 970 (page 56, the section about the 10% penalty exception):
Don't reduce the qualified education expenses by
amounts paid with funds the student receives as:
• Payment for services, such as wages;
• A loan;
• A gift;
• An inheritance given to either the student or the individual making the withdrawal; or
• A withdrawal from personal savings (including savings
from a qualified tuition program (QTP)).
https://www.irs.gov/pub/irs-pdf/p970.pdf
The Turbotax interview will handle each benefit, separately. TurboTax will ask an exception question, later in the
program, at the federal review (not at the retirement income/1099-R section)
and fill out form 5329, if needed. If you need to get there sooner, type> Form
5329 <in the search box.
