https://www.sfchronicle.com/business/networth/article/IRS-gives-rental-owners-clarity-on-20-percent-13545481.php

The IRS on Friday gave owners of rental properties a better idea how they can qualify for the 20 percent deduction on qualified business income from pass-through entities such as sole proprietorships, partnerships and S corporations.

This deduction is a big, complicated part of the sweeping Tax Cuts and Jobs Act that Congress passed in December 2017. It’s called the qualified business income deduction, or the 199A deduction after its section in the tax code.