One of the most important — and complicated — changes established by the new Tax Cuts and Jobs Act (TCJA) is Section 199A, which concerns the type of businesses known as "pass-through entities," also known as flow-through entities.
Basically, these businesses pass their profits on to their individual owners. That's how most small businesses work, including S corporations, partnerships and LLCs. (Sole proprietorships handle business income in a similar way using Form 1040 Schedule C and are also covered by the new rules.)
The good news is that if you own one of these businesses, you may get as much as a 20% reduction in taxes on business net income under the new rules. The calculations can be very complex, however. Several factors — including your level of income, your profession and the amount your business spends on wages and property acquired during the year — determine the actual deduction. Let's take a closer look.