To study target sales rebate contracts provided by suppliers to retailers, a two-echelon supply chain consisting of a financially capable supplier and a capital-constrained retailer is constructed. This study explores the retailer's financing and inventory decisions in response to stochastic demand and two-tier sales rebates. The results show that within a certain range, sales rebates incentivize retailers to increase order quantities and prompt capital-insufficient retailers to finance their orders. It is found that excessively high sales targets can reduce order quantities, leading to a situation where retailers have excess capital but do not place orders. Numerical analysis indicates that compared to linear rebate models, sales target rebates can enhance supply chain profits. A "follow-on ordering region" exists where retailers order just up to the sales target threshold, achieving Pareto improvements in profits for both supply chain parties, with order quantities unaffected by the retailer's own capital. Suppliers should motivate retailers to order through sales target rebates to achieve long-term cooperation and can reversely identify the actual capital situation of retailers based on their order quantities.