The SPM makes changes to how income is measured. Compared to the official measure, where only gross before-tax income is included, the SPM:
- Counts the value of federal in-kind benefits that are available to satisfy basic food, clothing, shelter, and utility (FCSU) needs, including nutritional assistance from the Supplemental Nutrition Assistance Program (SNAP) and school meals.
- Subtracts income and payroll taxes paid and adds refundable tax credits received.
- Subtracts from income other necessary expenses such as the cost of child care, other work expenses, child support payments, and out-of-pocket medical expenditures.
The SPM makes changes to the poverty thresholds. Compared to the official poverty threshold, which is set at three times the cost of the minimum food diet in 1963 and updated annually for inflation using the Consumer Price Index (all items), the SPM poverty threshold incorporates the following changes:
- The SPM poverty threshold is the 33rd percentile of out-of-pocket FCSU expenditures of consumer units with two children multiplied by 1.2.
- The SPM threshold varies based on the shelter and utility expenses of three groups: home owners with mortgages, home owners without mortgages, and renters.
- The SPM threshold is adjusted for geographic differences in housing costs to account for regional cost of living differences.
- The SPM uses the five-year moving average of FCSU expenditures to account for inflation.
The Census Bureau continues to release the official measure, which is not being replaced by the SPM. The new SPM thresholds are not intended to assess eligibility for government programs. The SPM is an additional macroeconomic statistic providing further understanding of economic conditions and trends.
 The U.S. Census Bureau released revised official poverty measures for 2010, 2011, and 2012 (that include unrelated children under age 15) for the exclusive purpose of comparison with the Supplemental Poverty Measure. We use these adjusted official poverty estimates. The official poverty estimates for 2009 are not adjusted.