Uncle Sam is giving New Yorkers an extra day to pay their taxes, thanks to a Massachusetts state holiday that will close a federal processing center in Andover on April 17.

Residents of five other eastern states and the District of Columbia also will have until midnight on Tuesday, April 18, to postmark their filings, the Internal Revenue Service said yesterday. All Americans have a couple of extra days to file this year, as the traditional Tax Day, April 15, falls on a Saturday.

The additional day for many residents in the Northeast comes because of Patriot’s Day, a holiday in Massachusetts and Maine that celebrates the anniversary of the Battle of Lexington and Concord, which took place on April 19, 1775. The Boston Marathon is held annually on Patriot’s Day, which is designated as the third Monday in April.

“It gives the procrastinators one more day,” a spokesman for the state’s Department of Taxation and Finance, Thomas Bergin, said. New Yorkers will also have an additional day to file their state taxes to Albany, Mr. Bergin said, because the state follows the IRS in setting an annual deadline.

Since 2004, most state residents file to Andover, Mass., but even those who don’t will have the extra day, the IRS said, to avoid confusion.

The last time Northeast residents got an extension from Patriot’s Day was in 2002, and they should get an extra day again next year, when April 15 falls on the Sunday before Patriot’s Day.

New Yorkers are likely to take advantage of the added time: While the state has already received more than 4 million out of the 9 million expected tax filings, more than half of all state residents wait until the last two weeks to file their returns, Mr. Bergin said.

Helen Chin, 37, of Lower Manhattan, said she would probably use the extra day. “We always file at the last minute,” she said.