This bill, known as the "USPS SERVES US Act," aims to modernize Postal Service regulations, enhance its financial stability, and improve accountability for service performance. It reforms the rate-setting process for market-dominant products, tying annual increases to the Consumer Price Index for All Urban Consumers (CPI-U) minus 0.5 percent, or another percentage determined by the Postal Regulatory Commission (PRC). Furthermore, the bill restricts rate changes to no more than once every 12 months, providing greater predictability for mailers. A significant aspect of the bill is the strengthening of the PRC's oversight capabilities. It authorizes the PRC to impose **sanctions** on the Postal Service by reducing future rate adjustment authority if the USPS fails to meet established service targets for at least one year, provided the failure is not due to external disruptive events and lacks a credible USPS recovery plan. The bill also improves procedures for changes in service, allowing the PRC to compel the USPS to justify plans that imply service changes without formal submission. To bolster consumer protection, the legislation establishes an **Office of the Customer Advocate** within the PRC. This office is mandated to represent the interests of the general public, particularly customers of market-dominant products, in all public proceedings of the Commission. Additionally, the bill streamlines the complaint process, revising timelines for the PRC to initiate proceedings and enabling the Commission to order **reimbursement** or reduce future rate authority if unlawful rates are charged or if the Postal Service causes unreasonable delays in complaint proceedings. The bill also introduces financial and operational reforms, including a provision allowing the PRC to authorize rate increases above the annual limit for "non-compensatory classes" of mail under strict conditions, such as meeting prior year service targets and demonstrating cost control. It clarifies that retained earnings considered in rate-setting must result solely from efficiency improvements or cost reductions. Finally, it mandates the PRC to develop an independent model for estimating mail demand and adds an objective to maintain and increase market-dominant mail volume. A key financial provision involves the **investment of the Postal Service Retiree Health Benefits Fund**. The bill directs the Secretary of the Treasury to immediately invest a specified percentage, initially 25%, of the fund in index funds, replicating the longest-term target date asset allocation fund of the Thrift Savings Plan. It establishes a **Postal Service Retiree Health Benefits Fund Investment Committee** to consult on these investments and requires annual audits and reports to Congress, aiming to improve the fund's long-term solvency.