Pension liabilities refer to the amount of money that a company or government entity is obligated to pay out in pensions, retirement benefits and other post-employment benefits (OPEB) to its retired employees. These liabilities are typically calculated based on factors such as the number of retirees, their ages, years of service, salaries, and expected rates of return on investments. Pension liabilities can have a significant impact on an organization's financial health, as they may require large amounts of funds to be set aside for future payments. As such, managing pension liabilities is an important aspect of financial planning and management for both employers and employees.