Which of the following factors affects a customer's eligibility for APTC?

The correct response indicates that several key factors collectively determine an individual's eligibility for Advance Premium Tax Credits (APTC).

Household size is significant because APTC calculations consider how many individuals reside in the household, which affects the income thresholds used to determine eligibility. Each household member can influence the overall economic picture considered when assessing qualifications for APTC.

State residency plays a role because APTC is offered through the individual marketplaces established by each state under the Affordable Care Act (ACA). Different states may have variances in their implementation of regulations and programs, and the income limits for APTC may differ based on state-specific guidelines.

Annual household income is perhaps the most crucial factor, as APTC is designed to assist individuals and families whose income falls between 100% and 400% of the federal poverty level. This metric directly impacts the amount of financial assistance a household may receive towards their health insurance premiums.

Considering all these elements—household size, state residency, and annual household income—it becomes evident that a comprehensive evaluation involves all these factors to determine APTC eligibility accurately. Hence, affirming that all aspects influence a customer's eligibility reflects an understanding of the interconnectedness of these criteria in the marketplace.