The qualified business income (QBI) deduction gives some owners of pass-through businesses a deduction worth up to 20% of their share of the company's qualified business income.âQualified business income" is similar to net income but excludes several types of income a business might show on its profit and loss statement. This includes interest, dividends, and capital gains, as well as income from businesses located outside of the U.S. You can find a full list of the types of income excluded from QBI in the IRS's Facts About the Qualified Business Income Deduction.