SANTA MONICA, Calif. -

June is looking like it will turn out to be a successful month for new- and used-car sales, even as the industry moves into the summer season that normally spells a slowdown after tax season highs.

According to TrueCar data, used-car sales from franchised and independent dealers as well as private-party sales are estimated to come in at 3.2 million for the month.

Meanwhile, new-car sales are predicted to end the month up 1 percent year-over-year, coming in at an expected 1.4 million unit sales.

This reprecents a predicted SAAR of 16.4 million new vehicle sales, up 3.2 percent from June 2013 and down 1.8 from this May.

“Summer selling season is off to an even better start than last year, despite one fewer weekend this June,” said John Krafcik, president of TrueCar. “Strong retail sales and stable incentive spending heading into the heart of summer give us confidence that 2014 will be the best year for automakers and dealers since 2007.”

Chrysler (170,000), Ford (219,000) and General Motors (257,000) are expected to lead manufacturers in new-car sales this month.

TrueCar expects the new to used ratio for June to come in at 1-to-2.3.

And as manufacturers gear up for the slower new-car sales summer months, incentive spending is on the rise.

According to TrueCar data, the industry average incentive spending per unit will be approximately $2,735 in June, an increase of 1.6 percent year-over-year and an increase of 2.4 percent from May.

Looking at total industry sales, fleet and rental sales are expected to make up 16.6 percent of that full number this month.

Rental sales remain strong as many older off-lease and off-rental vehicles are making their way into the wholesale arena, and companies are replacing aging fleets.