SNAP-Plus is a software program for preparing multi-year phosphorus (P)-based nutrient management plans in accordance with Wisconsin's 590 Nutrient Management Standard. The SNAP-Plus package includes the USDA-NRCS RUSLE2 soil loss prediction software program and Wisconsin's P Index, which is a surface-water-delivery-model P loss risk index for agricultural fields. The P Index is based on relationships between field characteristics, management practices and runoff P loads observed in field research and verified through on-going, year-round watershed monitoring projects throughout the state. As SNAP-Plus is designed for use by crop producers and consultants, program data requirements are limited to information readily available to those users. SNAP-Plus allows them to assess the effects of changes in management practices on soil and phosphorus losses across a crop rotation. Although this program is specifically for Wisconsin users, the principles for linking RUSLE2 and the P Index with nutrient management planning can be used in any state. A current version of the software is available for free at www.snapplus.net.