I understand in 2018 you can now use 529 college savings for private elementary and high school tuition. We are not taxed on any investments in the 529. But we've already been taxed on the $ before we invest it into the 529. We also are not taxed on it if we withdraw it from the 529 to pay for qualified education expenses (form 1099-Q). Is there any Federal credit on top of that for the tuition paid?