Final answer:
Decreases to a shareholder's basis in an S corporation include Distributions and Losses, while Contributions and Income increase the basis.
Step-by-step explanation:
The question pertains to changes in a shareholder's basis in an S corporation. Specifically, the decreases to a shareholder's basis. Among the options given:
- Distributions are indeed a decrease to the basis if they exceed the shareholder's basis in the stock.
- Losses allocated to shareholders also decrease the basis because they represent the shareholder's share of the corporation's losses.
- Contributions increase a shareholder's basis as they represent additional investment into the company by the shareholder.
- Income allocated to shareholders increases the basis as it represents the shareholder's share of the corporation's income.
Therefore, the correct answers that decrease a shareholder's basis in an S corporation are Distributions and Losses.