Can you clarify what type of qualified retirement plan you inherited? The options for beneficiaries vary depending on the type.
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You are not permitted to have rolled this distribution over to your own 401(k) account. Doing so likely constitutes a failed rollover, a taxable distribution from your father's 401(k) and and an excess contribution to your own 401(k). The only permissible rollover was a direct rollover to an inherited traditional or Roth IRA for your benefit, but that apparently is not what happened.