Every month, the Bureau of Labor Statistics (BLS) releases data on total nonfarm employment in two forms: seasonally adjusted and not seasonally adjusted.
- Seasonally adjusted (SA) employment data have had the effects of seasonal changes removed, such as the typical increase in hiring during the holiday season. This allows us to more clearly see the business cycle trends in employment.
- Not seasonally adjusted (NSA) employment data are the raw employment levels at a given time.
Our FRED graph above tracks the past two years of SA and NSA employment levels, showing how the number of workers rises and falls throughout the year. Looking at the latest initial data for July 2025, we can see the NSA number of jobs declined by over 1 million, while the SA number increased by 73,000.
With almost 160 million workers, the BLS cannot count each job every month. They use a sample of data from the Current Employment Statistics (CES) survey and a model to estimate hiring and layoffs by new firms that arose and former firms that went out of business since the previous survey. The BLS website provides more information on this process.
Because of this estimation, revisions to employment data are common. The BLS receives additional responses after their initial release of monthly data and adjusts as seasonal factors are more accurately calculated for the year. Check this FRED Blog post for more insight into BLS revisions.
Our next two graphs come from ALFRED: They show the revisions to the May and June SA and NSA employment numbers between the release of the data on July 3, 2025, and the next release of the data on August 1, 2025. The changes in SA employment were revised down by 258,000. This feeds into the total employment for June, which decreased from 159,724,000 to 159,466,000, or a –0.16% change in total employment.
To see which portion of the revision was driven by late-survey responses and which portion came from revisions to the seasonal adjustment, we can use the NSA revisions to decompose this number. Looking at the NSA revisions in the change in employment below, May and June were revised down by a combined 182,000. Taking this number to the seasonally adjusted number and subtracting it, we can see a downward revision of 76,000 came from the new calculations of seasonal adjustment. Both of these revisions were in the same direction, but sometimes they offset one another, which is why we subtract the NSA from the SA numbers.
A second and final revision for the June numbers will occur on September 5, when the first revisions for the July numbers will also be available. The May numbers were finalized in the August release.
How these graphs were created: First graph: Search FRED for “All Employees, Total Nonfarm” and click the first link to get the seasonally adjusted numbers. Then click the blue “Edit Graph” and open the “Add Line” tab. Search for PAYNSA and click the first result for the not seasonally adjusted numbers and then go to the format tab and click customize to change the line style to dash and the color to red. Then change date range to the last two years. Next two graphs: Go to ALFRED and search for All Employees, Total Nonfarm and click the first series labeled Monthly, Seasonally Adjusted. Use the “Edit Graph” panel to change the units to Change, Thousands of Persons. Select Bar 2 and do the same. Repeated this process for the Monthly, Not Seasonally Adjusted series.
Suggested by John Fuller and Charles Gascon.