Still haven’t filed your income-tax return?

Following are some tips that may come in handy ahead of the filing deadline, which is midnight on Tuesday:

•Federal Tax: The Providence office of the Internal Revenue Service is holding special Saturday hours today, from 9 a.m. to 1 p.m., for people who need last-minute help.

The office, at 380 Westminster St., has forms and publications available. Representatives can also answer tax-related questions.

In addition, IRS representatives there can prepare and electronically file your federal income-tax return if your gross income was $40,000 or less last year, IRS spokeswoman Peggy Riley said.

(If you want to take advantage of this free service, be sure to bring a photo identification, Social Security cards for all those to be listed on your return, as well as wage statements, interest statements and other documents that you’d normally need to file a complete and accurate return.)

Also today, the office will be helping low-income people file an informational return on U.S. Form 1040A to claim a rebate under the new federal economic stimulus law.

Separately, Sen. Sheldon Whitehouse has encouraged eligible Rhode Islanders to file for the earned-income credit, a tax break intended to help the working poor.

In general, families earning up to $39,783 may qualify for the credit, he said. The maximum credit, available to families with two or more qualifying children, is $4,716, he said.

For more information about the credit, or other federal income-tax issues, call the IRS toll-free at (800) 829-1040, or use the IRS Web site:

www.irs.gov

Also on the IRS Web site is a link to the agency’s Free File service, which generally lets you prepare and file your federal return, online at no charge, if you meet certain income or other restrictions.

Forms and publications are also available at the following IRS Web site:

www.irs.gov/formspubs

The IRS’s Providence and Warwick offices will be open Monday and Tuesday from 8:30 a.m. to 6:30 p.m. (The Warwick office is at 60 Quaker Lane.)

•Postal Service: The main U.S. Post Office, at 24 Corliss St., Providence, will be open during the following hours:

•Today from 8 a.m. to 6 p.m.

•Tomorrow from 10 a.m. to 6 p.m.

•Monday from 7 a.m. to 9 p.m.

•Tuesday from 7 a.m. to midnight.

To alleviate congestion on Tuesday, postal employees, wearing orange reflective vests and U.S. Postal Service ID badges, will be available on the corner of Corliss and Charles Streets to accept stamped tax returns for customers who do not need to go inside the Post Office. Two detailed police officers will be on Charles and Corliss streets to control traffic.

(Keep in mind, however, that you must bring into the Post Office any envelope or package weighing over 13 ounces so it can be weighed, stamped and postmarked at the customer window. Mail weighing more than 13 ounces that is dropped in a mail collection box or given to the carrier for mailing will be returned to sender.)

Other post offices will have regular hours, Postal Service spokeswoman Christine Dugas said.

Also keep in mind that a number of Post Offices throughout the region, including the Corliss Street site, have automated postal centers, which are accessible around the clock. (The centers accept credit cards, Dugas said.)

More information about the postal service is available at its Web site:

www.usps.com

•Rhode Island Tax: The Rhode Island Division of Taxation headquarters, at One Capitol Hill, Providence, (Smith Street, opposite the State House), will be open from 8:30 a.m. to 4 p.m. Monday and Tuesday.

The office has forms and instructions available. Representatives will also be on hand to answer your tax-related questions.

You can also visit the office from 8:30 a.m. to 3:30 p.m. Monday and Tuesday to get help preparing your state income-tax return or your application for a rebate under Rhode Island’s statewide property-tax relief program.

You can also call the agency at (401) 222-1040 from 8:30 a.m. to 4 p.m. Monday and Tuesday, but keep in mind that call volume is high because the filing deadline is near, said state Tax Administrator David M. Sullivan.

Tax forms and instructions are available at the agency’s Web site:

www.tax.ri.gov

•Massachusetts Tax: For information about filing a Massachusetts return, call the Massachusetts Department of Revenue from within Massachusetts toll free at (800) 392-6089, or from outside Massachusetts at

(617) 887-6367, or use the agency’s Web site:

www.mass.gov/dor

•Connecticut Tax: For information about filing a Connecticut return, call the Connecticut Department of Revenue Service from within Connecticut toll free at (800) 382-9463, or from outside Connecticut at (860) 297-5962, or use the agency’s Web site:

http://ct.gov/drs

•Journal Site: The Providence Journal’s Web site includes a “Tax Time” section which features articles and links focusing on federal and state tax topics:

www.projo.com/business/taxes