No, you do not have to file an amended return as the K-1 you just received did not affect your tax liability. If Box 21 is blank then more than likely you will not have to file an amended return when you receive the K-3 in August. "..Schedule K-3 reports a partner's distributive share of items of international tax relevance and is an extension of the Form 1065 Schedule K-1. " Ref: https://Schedules K-2 and K-3 Frequently Asked Questions (Forms 1065, 1120S, and 8865)
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