WESTPORT — The owner of a local tree business, who pleaded guilty last December to not paying taxes on more than $900,000 in unreported income, has been sentenced to one year and a day in prison for tax evasion.

Robert Porzio, 48, owner of Bert’s Tree Service, was sentenced Monday by Judge Stefan Underhill at U.S. District Court in Bridgeport, according to a statement from Leonard Boyle, the U.S. attorney for Connecticut.

The Westport resident also will be subject to a year of supervised release following his prison term, and was ordered by the judge to pay a $25,000 fine.

Porzio, according to the U.S. attorney’s office, in the 2012-16 tax years failed to report more than $900,000 in additional income from tree service customers’ checks that he deposited in personal bank accounts. He did not inform the business’s bookkeeper about the additional payments, the U.S. Attorney’s Office said.

The diverted revenues were not reported on Porzio’s personal income tax returns or those of his business, the prosecutors added.

Porzio’s unreported income-tax liability and the tree company’s payroll tax obligations resulted in a loss of $331,388 to the Internal Revenue Service, according to the statement.

Porzio has paid his back taxes, officials said, but he still owes interest and penalties.

The IRS Criminal Investigation Division investigated the case, which was prosecuted by Assistant U.S. Attorney Anastasia King.