Vanguard Group will pay $106.4 million to settle U.S. Securities and Exchange Commission charges alleging it failed to disclose important tax information about its popular target-date funds, resulting in hundreds of thousands of ordinary investors getting stuck with inflated tax bills.

An investigation by the S.E.C. and several states found that the company had failed to notify investors of changes in the terms of some funds, leading to higher capital gains taxes.

More than 15,000 New York investors, including 2,700 Long Islanders, were forced to pay higher capital gains taxes after Vanguard made changes to retirement funds.