You can do one of two things: 1) File an amended return to include the 1099-R with Code P, or 2) Do nothing. Sooner or later, the IRS will send you a letter proposing a change to your tax return based on the 1099-R information that was filed with them by the 401(k) custodian. It won't be lot, but you will also be billed for additional tax, penalty, and interest. I would go ahead and file the amended return.
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