Progress Payment Invoices are an important part of getting paid on time. They are documents that specify what goods or services have been delivered and the amount owed by the purchaser to the supplier. Progress Payments allow suppliers to cover costs associated with delivering the goods or services in the agreed upon contract – such as labor costs, materials, etc. By breaking down payments into smaller increments, rather than one lump sum at the time of completion, suppliers can manage their cash flow more easily. It’s a win-win situation for suppliers and purchasers alike.