Yes, these rollovers are limited to the annual contribution limit. Therefore, the 7,000 limit would apply for 2024, if they are under 50.
Pub 590-A states:
"Qualified tuition program rollover to a Roth IRA.
Beginning with distributions made after December 31, 2023, a beneficiary of a section 529 qualified tuition program is permitted to roll over a distribution from the section 529 account to a Roth IRA for the beneficiary if certain requirements are met.
- The rollover must be paid through a direct trustee-to-trustee transfer to a Roth IRA maintained for the benefit of the beneficiary.
- The rollover amount for a year cannot be more than the Roth IRA annual contributions limit, and all such rollovers for the individual’s lifetime cannot exceed $35,000.
- The rollover must be from a section 529 account that has been open for more than 15 years.
- The distribution cannot exceed the aggregate amount contributed to the program (and earnings attributed to the contributed amount) before the 5-year period ending on the date of the distribution.
A distribution made after December 31, 2024, and before April 15, 2025, that is rolled over to a Roth IRA by April 15, 2025, and designated for 2024 would be reported as a Roth IRA contribution for 2024."
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