Cost-sharing subsidies and premium tax credits are two different types of financial assistance offered through the Health Insurance Marketplace, but they serve different purposes. Premium tax credits help lower the cost of your monthly health insurance premiums based on your income. In contrast, cost-sharing subsidies reduce your out-of-pocket costs when you receive healthcare services, such as lower deductibles, copayments, and coinsurance. These subsidies are only available with Silver plans and are based on your income level.