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You put $60/month into a 529 starting at birth. At a 10% average return, that’s about $36k by their 18th birthday. Congress now lets you roll up to $35k of unused 529 money into a Roth IRA in your kid’s name. That $35k, plus $100/month of their own contributions from 18 to 65, compounds to over $4 million. Tax free. The fine print: the rollover isn’t a lump sum. It happens over several years because each year counts against the annual IRA contribution limit. The 529 has to be open at least 15 years, and your kid needs earned income in the years you roll it over. None of that changes the strategy. It just means the clock matters. The account you open this month is the one that qualifies in 15 years.