Due Dates and Extension Information

Partnerships must file Form 510 by the 15th day of the 4th month following the close of the taxable year or period. S corporations must file Form 510 by the 15th day of the 3rd month following the close of the taxable year or period.

If unable to file Form 510 by the due date, see Form 510E - Application for Extension of Time to File Pass-Through Entity Income Tax Return for instructions on how to file an extension.

Properly and timely filed requests for extensions of time will be automatically granted for three months for partnerships and six months for S corporations.

Applications are due by the 15th day of the 4th month following the close of the tax year or period for partnerships or by the 15th day of the 3rd month for S corporations.

You may file for an extension online, telefile your extension by calling 410-260-7829 or toll free at 1-800-260-3664 or by mailing if tentative tax is due or if this is the first filing of the entity.