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The K-1 reports your share of the investment's 2020 income, losses, deductions and credits, while the 1099-B reports the sale of the investment itself.

In addition to reporting 2020 income, you also need information from the K-1 to calculate your cost or other basis for the investment.

To avoid "double-counting", follow the instructions in the following post: Reporting Sale of publicly-traded limited partnerships 

The sale of the ETF is reported on the "Stocks, Mutual Funds, Bond and Other"  interview of investment income.

The current year income is reported in the "Schedule K-1" interview of Business Investment and Estate Trust Income.

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