Qualified production activities income, or QPAI, is money that a business earns from selling or making products. For example, a toy store that sells toys or a car manufacturer that makes cars. This type of income is considered "qualified" because it meets certain requirements set by the government to encourage businesses to create products in the United States.
To calculate QPAI, a business will figure out their total revenue from products sold during the year, subtract any costs associated with producing those products (like materials and labor), and then subtract a special tax deduction that is only available to businesses that make products in the US. The result is the business's QPAI.
QPAI is important for tax purposes because it is taxed at a lower rate than other types of income. This is because the government wants to encourage businesses to create products in the United States, which helps the economy and creates jobs. By offering a tax break for QPAI, it incentivizes businesses to continue creating products domestically.
In summary, QPAI is money that businesses earn from making and selling products in the US, and it is taxed at a lower rate to incentivize businesses to continue creating products domestically.