Contract Spending and Federal Headcount Often Moved Independently

The measures do not move as one

Contract obligations and federal employment describe different parts of agency capacity. Obligations record the legal commitments agencies make on contracts. Headcount measures the covered federal workforce reported through OPM. An agency can add employees and contract obligations at the same time, reduce both, or move them in opposite directions.

Federal Hiring Data calculated a correlation of 0.169 between the percentage change in contract obligations and the percentage change in September headcount in this sample. That is a weak positive relationship, not evidence of a consistent one-for-one connection. The median agency had a 9.5% increase in nominal contract obligations and a 1.2% increase in covered headcount.

This finding does not mean contracting replaced federal employees. It shows why spending and staffing must be measured separately before making claims about how an agency delivers its work.

Agency comparisons

The table below shows a reviewed set of large departments and agencies from the 28-agency calculation. Dollar values are nominal and have not been adjusted for inflation. Headcount is the OPM-covered September workforce summed to the mapped parent agency.

Five agencies moved in opposite directions

Five agencies in the bounded sample had higher contract obligations in FY2025 and lower September headcount than in FY2019: Defense, Justice, Interior, Social Security, and the Securities and Exchange Commission.

The scale and direction differed sharply. Defense contract obligations rose from about $383.6 billion to $491.7 billion, while covered headcount fell 3.5%. Interior obligations rose 66.7% while headcount was almost flat, down 0.1%. Social Security obligations rose 11.0% while headcount fell 16.0%. Justice and the SEC had smaller obligation increases alongside modest headcount declines.

These are descriptive pairings. Contract portfolios include goods, technology, facilities, professional services, and many other purchases. A department-level total cannot identify which contracts complement employees, automate work, support a surge, or serve a mission unrelated to staffing.

Other agencies grew on both measures

Several large agencies increased both contract obligations and covered headcount. Veterans Affairs obligations rose from about $28.8 billion to $78.3 billion while headcount increased 14.2%. Homeland Security obligations increased 61.9% while headcount rose 9.9%. Treasury obligations increased 83.9% while headcount rose 23.4%. Energy also recorded increases on both measures.

Other agencies moved down together. Health and Human Services had a 3.8% decline in nominal contract obligations and a 5.6% decline in September headcount. Commerce and Education also had lower values on both measures in this comparison.

The variation is the central result. There is no single federal pattern that turns a change in contract obligations into a predictable staffing change.

How Federal Hiring Data calculated this

The spending measure comes from the official USAspending API. Federal Hiring Data summed contract obligations by awarding top-tier agency and fiscal year. The workforce measure comes from official OPM workforce files and uses September employment summed to the parent department.

Agencies were joined only where the USAspending top-tier name matched a verified OPM parent-agency identity after conservative normalization. The analytical sample required positive FY2025 obligations, at least $100 million in FY2019 contract obligations, and nonzero September headcount in both years. Twenty-eight agencies met those rules.

The reported correlation is the Pearson correlation between the two percentage-change measures across those 28 agencies. The threshold avoids unstable percentage changes from very small contract bases, but it also means the result should not be generalized to every independent board or commission.

Limits readers should keep in view

• Obligations are nominal dollars, not inflation-adjusted purchasing power, outlays, contract counts, or contractor headcount.
• OPM coverage does not include every person working for the federal government, and agency reporting structures can change.
• September headcount is a fiscal-year endpoint, while contract obligations accumulate throughout the fiscal year.
• Department totals can hide major differences among components and contract categories.
• The observed relationship is descriptive and cannot establish why either measure changed.