New Zealand shares ended flat on Tuesday as Wall Street saw a session of losses ahead of the upcoming US Federal Reserve rate decision later this week.

The S&P/NZX 50 Index was little changed to close at 12,421 points.

On Monday, the blue-chip Dow fell 0.2%, while the Nasdaq Composite lost 0.7% and the S&P 500 finished down 0.6%.

The US President Donald Trump has been outspoken about his strong recommendation for the Fed to lower rates, but the majority consensus expects the Fed to leave rates unchanged.

On the domestic front, consumer spending through all core retail merchants in Worldline NZ's payments network rose 0.9% year on year to NZ$3.74 billion in April, buoyed by multiple holidays during the month, the payments company reported Monday.

Meanwhile, the ANZ World Commodity Price Index was flat month-over-month in April, according to a Tuesday report from ANZ Research.

In corporate news, SkyCity Entertainment Group (NZE:SKC, ASX:SKC) now expects earnings before interest, taxes, depreciation, and amortization for fiscal year to fall to around 4% below the bottom of its current guidance range of NZ$225 million to NZ$245 million due to a continuous deterioration of market conditions.

Summerset Group Holdings (ASX:SNZ, NZE:SUM) said it is considering a six-year fixed-rate bond offer to institutional and New Zealand retail investors.