USDA's Economic Research Service uses the Food Assistance National Input-Output Multiplier (FANIOM) model to represent and measure linkages between USDA's domestic food assistance programs, agriculture, and the U.S. economy. This report describes the data sources and the underlying assumptions and structure of the FANIOM model and illustrates its use to estimate the multiplier effects from benefits issued under the Supplemental Nutrition Assistance Program (SNAP, formerly the Food Stamp Program). During an economic downturn, an increase in SNAP benefits provides a fiscal stimulus to the economy through a multiplier process. The report also examines the different types of multipliers for different economic variables that are estimated by input-output multiplier and macroeconomic models and considers alternative estimates of the jobs impact. FANIOM's GDP multiplier of 1.79 for SNAP benefits is comparable with multipliers from some macroeconomic models.