New Zealand's services sector slipped from a six-year high in June while remaining broadly in expansion mode, led by new orders and sales.

The BNZ-Business New Zealand Performance of Services Index fell to 55 last month, from 56.2 in May, still the highest for the month of June since 2007. A reading above 50 indicates an expansion in activity.

The June PSI is "maybe not a gold medal performance, but surely a solid silver," said Doug Steel, economist at Bank of New Zealand.

"A new orders index at close to 60 is getting up there and bodes well for expansion ahead."

Of the other three main diffusion indexes, employment slipped back to 50.1 from 53.6 in May, stocks/inventories rose to 53.8 and supplier deliveries fell to 55.

On a regional breakdown, the northern region fell 3.7 points to 54.9 and the central region declined 2.3 points to 50.9. Canterbury/Westland jumped to 53.3 in June after two months of contraction and Otago/Southland recorded 56.9, the highest since March.

The combined manufacturing and services index, the BNZ-BusinessNZ Performance of Composite Index slipped last month.

The GDP-Weighted Index fell 1.4 points to 55 and the Free-Weighted Index fell 2.4 points to 55.2.