What Is the Employment Cost Index (ECI)?

By Markets & Investing DeskUpdated Nov 10, 2026

Illustration · Fintrev

Definition

The Employment Cost Index (ECI) is a quarterly Bureau of Labor Statistics measure of how U.S. employers' wage and benefit costs change for a fixed mix of jobs.

Key takeaways

The ECI tracks the quarterly change in employee compensation per hour worked: wages and salaries plus employer-paid benefits such as health insurance, retirement plans and paid leave.
Fixed employment weights keep shifts into higher- or lower-paying jobs from distorting it.
Economists and the Federal Reserve watch it as a gauge of labor-market tightness and wage-driven inflation pressure.
It is released only quarterly, so monthly wage data often shapes expectations first.

The Employment Cost Index (ECI) is a quarterly measure of how much U.S. employers’ labor costs change over time, covering both wages and salaries and the cost of benefits. The Bureau of Labor Statistics (BLS), part of the U.S. Department of Labor, publishes it. Because it holds the mix of jobs constant, the ECI isolates changes in what employers pay for the same work. Shifts in who is employed do not move it.

What the ECI measures

The ECI covers civilian workers in the private nonfarm economy (excluding private households and the self-employed) and in state and local government. Federal government employees are not included. The underlying survey samples roughly 7,000 private business establishments and about 1,400 state and local government units.

Compensation is split into two parts:

Wages and salaries: straight-time pay for salaried and hourly work, including items such as production bonuses and commissions.
Benefits: employer costs per hour worked across 18 benefit categories, ranging from legally required items like Social Security contributions to paid holidays, health insurance and retirement plans.

The BLS publishes the headline index for total compensation and separate series for wages and benefits, broken down by industry, occupational group, region, bargaining status (union vs. nonunion) and ownership (private industry vs. state and local government).

How the Employment Cost Index works

The BLS collects payroll data from sampled employers in the final month of each quarter (March, June, September and December), for a pay period around the middle of that month. The same jobs at the same establishments are priced quarter after quarter. A change in cost therefore reflects a change in pay or benefits for that job, not a change in which job is being measured.

Calculating the Employment Cost Index

The ECI is a fixed-weight (Laspeyres-type) index. Each occupation and industry cell gets a weight based on its share of employment in a base period, and those weights stay fixed. In simplified form:

ECI(t) = [Σ (weight × compensation cost per hour at time t) ÷ Σ (weight × compensation cost per hour in base period)] × 100

The percent change between two periods is:

Percent change = (ECI current ÷ ECI previous − 1) × 100

The index is set to 100 in its base period. A reading of 160 means compensation costs for the fixed job mix are 60% higher than in that base period.

Worked example (hypothetical)

Assume an economy with two occupations and fixed weights of 60 workers in Occupation A and 40 in Occupation B.

	Weight	Base cost/hour	Next quarter cost/hour
Occupation A	60	$30.00	$30.60
Occupation B	40	$50.00	$50.75

Base aggregate: (60 × $30.00) + (40 × $50.00) = $3,800
Next-quarter aggregate: (60 × $30.60) + (40 × $50.75) = $3,866
ECI = $3,866 ÷ $3,800 × 100 = 101.74, a 1.74% quarterly increase

Now suppose there are no raises at all, but employers shift hiring so the workforce becomes 40 in A and 60 in B. Average hourly compensation rises from $38.00 to $42.00, about 10.5%, even though no one’s pay changed. The ECI stays at 100 because its weights are fixed, which is why analysts prefer it to simple averages for measuring whether employers are paying more for the same work.

Interpreting the Employment Cost Index

Two rates of change get the most attention:

Quarterly change, usually seasonally adjusted, which shows the most recent momentum.
12-month change, not seasonally adjusted, which smooths out quarter-to-quarter noise and compares directly with annual inflation figures.

A rising trend generally signals strong demand for labor and a tight job market. If compensation grows faster than productivity, employers’ cost per unit of output rises, and firms with pricing power may pass those costs on to customers. For that reason, an ECI reading well above expectations is often treated as a sign of building inflation pressure.

Why the Employment Cost Index matters

Monetary policy. The Federal Reserve treats the ECI as one of its main measures of wage growth. Labor is a large share of business costs, so sustained compensation growth above what productivity can support is relevant to the inflation outlook and to interest rate decisions.

Investors. Markets can react when the ECI differs sharply from consensus estimates. Higher-than-expected labor cost growth can push up inflation expectations and bond yields. Equity investors look at the industry breakdowns because labor’s share of total costs varies widely between sectors, so the same wage increase affects margins differently.

Employers. Companies use the ECI to benchmark their own pay and benefit changes against their industry and occupation group when setting raises.

Contracts and budgets. Because it measures cost changes for a constant job mix, the ECI is commonly used as an escalation index in long-term contracts and in cost projections where labor is a major input.

ECI vs. Consumer Price Index: The Consumer Price Index tracks prices consumers pay for a fixed basket of goods and services. The ECI applies a similar fixed-basket idea to jobs, tracking what employers pay for labor. The headline ECI is a nominal measure, so comparing its 12-month change with the CPI’s over the same period shows whether compensation is keeping pace with inflation.
ECI vs. average hourly earnings: The monthly Employment Situation report publishes average hourly earnings, which are timelier but cover wages only. They can also be pulled up or down by changes in the job mix, as the example above shows.
ECI vs. Employer Costs for Employee Compensation (ECEC): The ECEC comes from the same survey but reports cost levels in dollars per hour worked, such as how much an employer spends on health insurance per hour. The ECI reports changes in costs as an index.
ECI vs. productivity data: Productivity measures output per hour. Compensation growth only becomes a cost pressure to the extent it outpaces productivity, so analysts read the two together, often within the specific industries they follow.

Limitations of the Employment Cost Index

Quarterly frequency. Data arrives only four times a year for a mid-month reference period, so it can lag fast-moving labor conditions. Monthly hourly earnings data also gives markets an early read, which can blunt each release’s impact.
Lagging signal. Rising labor costs typically show up after overheating has already appeared in earlier indicators such as commodity prices, retail sales or output growth.
Volatility from irregular pay. Bonuses, commissions and other periodic payments, especially around year-end, can make individual quarters jumpy and require careful interpretation.
Fixed weights can drift from reality. The index does not show what employers’ total payroll costs actually did when the workforce composition changed.

The Bottom Line

The ECI matters most to Federal Reserve watchers, investors, employers setting raises, and anyone using labor cost escalation clauses in long-term contracts. Its fixed job weights make it a cleaner read on whether employers pay more for the same work than average hourly earnings. Readers should weigh it alongside productivity and monthly wage data, since it arrives only quarterly and can lag fast-moving conditions.