The letter "Z" in box 20 denotes a qualified small business income (QBI) deduction. Often you enter the same amount as listed for your income on line 1 to 3 of your K-1 schedule. You need to make sure you enter the sign properly, if you have a loss in line 1, then you need to enter the QBI deduction as a negative number.
You will not be able to e-file your tax return if there is an error in it, and the QBI deduction may lower your tax, so you should correct the error before you file your tax return.
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