2021 SIPP Data
The 2021 SIPP continued to face data collection complications due to the COVID-19 pandemic and a general lower-than-average unit response rate nationally. For technical documentation and more information about SIPP data quality, please visit the Technical Documentation page.
📢 The COVID-19 pandemic resulted in substantial mid-year changes in the landscape of certain social safety net programs in the U.S.; however, 2021 SIPP data do not fully reflect known volatility in the Supplemental Nutrition Assistance Program (SNAP, also sometimes called food stamps) and unemployment insurance (UI, also sometimes called unemployment compensation). In response to these data concerns, the Census Bureau released a supplemental research file that contains experimental versions of SNAP and UI estimates, derived using experimental edit and imputation processes. Please see the Is there a Safety Net for Surveys? working paper and 2021 SIPP Research File data page for more information.
📢 2021 SIPP data were updated on 7/24/2025 to correct an issue with Social Security Income Processing. Please see this year’s Release Notes for more information.
For questions about SIPP data, visit the Contact Us page.
Data and Documents - Longitudinal Weights for 4-Year Cohort
Longitudinal weights for the cohort of respondents who have data in the 2018 SIPP, 2019 SIPP, 2020 SIPP, and 2021 SIPP data files, in SAS, STATA, and pipe-delimited text formats, compressed as zip and gzip archives.
SAS Data Format
STATA Data Format
Pipe-Delimited Text Format
Supporting Documents
Data and Documents - Longitudinal Weights for 3-Year Cohort
Longitudinal weights for the cohort of respondents who have data in the 2019 SIPP, 2020 SIPP, and 2021 SIPP data files, in SAS, STATA, and pipe-delimited text formats, compressed as zip and gzip archives.
SAS Data Format
STATA Data Format
Pipe-Delimited Text Format
Supporting Documents
Data and Documents - Longitudinal Weights for 2-Year Cohort
Longitudinal weights for the cohort of respondents who have data in the 2020 SIPP and 2021 SIPP data files, in SAS, STATA, and pipe-delimited text formats, compressed as zip and gzip archives.
SAS Data Format
STATA Data Format
Pipe-Delimited Text Format
Supporting Documents
Data and Documents - Longitudinal Replicate Weights for 4-Year Cohort
Longitudinal replicate weights for the cohort of respondents who have data in the 2018 SIPP, 2019 SIPP, 2020 SIPP, and 2021 SIPP data files, in SAS, STATA, and pipe-delimited text formats, compressed as zip and gzip archives.
SAS Data Format
STATA Data Format
Pipe-Delimited Text Format
Supporting Documents
Data and Documents - Longitudinal Replicate Weights for 3-Year Cohort
Longitudinal replicate weights for the cohort of respondents who have data in the 2019 SIPP, 2020 SIPP, and 2021 SIPP data files, in SAS, STATA, and pipe-delimited text formats, compressed as zip and gzip archives.
SAS Data Format
STATA Data Format
Pipe-Delimited Text Format
Supporting Documents
Data and Documents - Longitudinal Replicate Weights for 2-Year Cohort
Longitudinal replicate weights for the cohort of respondents who have data in the 2020 SIPP and 2021 SIPP data files, in SAS, STATA, and pipe-delimited text formats, compressed as zip and gzip archives.
SAS Data Format
STATA Data Format
Pipe-Delimited Text Format
Supporting Documents
Data Disclosure Statement
The U.S. Census Bureau reviewed these data for unauthorized disclosure of confidential information and approved the disclosure avoidance practices applied to this release. CBDRB-FY22-258 & CBDRB-FY25-0011.