The National Federation of Independent Business (NFIB) index rose to 91.9 in December from November's 90.6. It was the first increase since July and matched that month's reading, but it held below its 50-year average of 98 for a 24th-straight month.

Conditions have tracked the Federal Reserve's most aggressive rate hike campaign since the 1980s, launched in 2022, during which small business owners have described tightened credit conditions.

A net negative 25% of businesses reported improved profits in December, a 7 point increase from the month prior, with labor costs continuing to weigh on earnings, the report said.

Inflation was the top problem for owners, and the share of owners reporting inflation as their main concern rose to a seasonally adjusted 23%. The jump comes after U.S. consumer prices unexpectedly rose 0.1% in November, Bureau of Labor Statistics data showed.

On a 12-month basis, prices in November edged up 3.1% driven in part by a resurgence in the prices of cars and trucks, the BLS data said. Uncertainty around future economic conditions has also eroded the business outlook, the NFIB report said.

The share of business owners citing labor quality as their greatest concern fell four points to 20%, while labor costs rose slightly as an area of worry. The portion of owners expecting better business conditions on a six-month basis rose 6 points to a net negative 36% in December.

(Reporting by Amina Niasse; Editing by Andrea Ricci)

By Amina Niasse