DETROIT >> With its sales slowing and its stock price tumbling, Tesla Inc. slashed prices dramatically today on several versions of its electric vehicles, making some of its models eligible for a new federal tax credit that could help spur buyer interest.

The company dropped prices by nearly 20% in the United States on some versions of the Model Y SUV, its top seller. That cut will make more versions of the Model Y eligible for a $7,500 electric-vehicle tax credit that will be available through March. It also reduced the base price of the Model 3, its least expensive model, by about 6%.

Far from pleasing investors, the sharp price cuts sent Tesla shares down about 3% in early trading today. Since the start of the year, the stock has plummeted more than 65%. Many investors fear that Tesla’s sales slowdown will persist and have grown concerned about the erratic behavior of CEO Elon Musk and the distractions caused by his $44 billion purchase of Twitter.

“I think the real driver for all of this is falling demand for Teslas,” said Sam Abuelsamid Guidehouse, an analyst Research e-Mobility.

Itay Michaeli, an industry analyst at Citi, wrote in a note to investors that Tesla appears to be prioritizing sales volume over price — a strategy that could affect its profit margins, at least in the near term.

Messages were left today seeking comment from Tesla.

The Model Y Performance version, formerly priced at nearly $70,000, now starts at just under $57,000. The starting price of the Model 3, Tesla’s lowest-priced vehicle, was cut to just under $44,000 from $47,000.

The company’s decision to drop the base price of the Model 3, which had already been eligible for the federal tax credit, is a clear sign that demand had weakened, Abuelsamid noted.

Tesla has added two huge factories in Austin, Texas, and Berlin that are running at only a fraction of their output capacities, “which is undoubtedly costing them dearly,” Abuelsamid said.