Final answer:
Under the ACA, individuals had to purchase health insurance or pay a fine, which was set to $0 starting in 2019. The AHCA proposal aimed to replace the ACA but was not enacted, so there's no fine under the AHCA.
Step-by-step explanation:
Under the Affordable Care Act (ACA), individuals were required to purchase health insurance or face a fine; this was known as the individual mandate. However, the Tax Cuts and Jobs Act of 2017 reduced the individual mandate penalty to $0 starting in 2019, effectively eliminating the fine for not having health insurance under the ACA. The American Health Care Act (AHCA) proposal, which was an effort by some members of Congress to repeal and replace the ACA, did not become law, so there is no fine under the AHCA as it was not enacted.