how much does usps insurance cost How much does USPS insurance cost depends on the declared value of the shipment. For domestic mail, insurance starts at about $2.70 for packages valued under $50 and increases incrementally with value. Priority Mail includes up to $100 insurance at no extra charge, while Priority Mail Express includes up to $100 automatically. Additional coverage is available for high-value items. USPS insurance protects against loss or damage and requires proof of value for claims. Online purchases often offer discounted insurance rates.