How many 401k rollovers are allowed per year?

one rollover
Rollovers must be completed within 60 days of receiving funds out of the old account, and only one rollover can occur per year. Direct transfers of retirement account funds to a new qualified account can be a more efficient method and can avoid breaking many of these rules by mistake.

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What happens if you do more than one rollover in a year?

One of the cardinal sins you can commit with an IRA rollover is to run afoul of the IRS “once-per-year” rollover rule. Violating that rule triggers a taxable distribution and the 10% early distribution penalty if you are under age 59 ½.