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Unfortunately, TurboTax won't allow me to proceed with e-file if Box 16 is checked and no K-3 information is entered. Strangely, the included Part X of this K-3 only includes values in the (a) Total and (c) U.S. source columns. The partnership is US based and I am a US citizen. If there is no foreign source, can I just uncheck box 16 and disregard the K-3?