At the same time, hiring remained strong through March, and wages continue growing faster than Fed officials feel is sustainable.
The ECI is only released quarterly and includes both worker pay and benefits like healthcare, giving what Fed officials regard as a clearer sense of employment-related cost trends.
For Fed officials, it could influence their view of whether the economy and inflation are likely to slow more - perhaps much more - quickly than anticipated.
Reuters GraphicsEconomists expect the upcoming survey will show conditions tightening further still, this time alongside data showing credit from banks in decline.
"Banks may not be done tightening lending standards, which will restrict access to credit, hurt business investment, reduce business formation, and weigh on job growth and consumer spending."