With the deadline for filing tax returns rapidly approaching, the United States Postal Service reminds last-minute filers to pay special attention to collection box pickup times and Post Office retail hours on Monday.

Post Offices in Pennsylvania will be open regular business hours on Monday.

Post office, self-service kiosks and collection box location, hours, and pickup time information is available at 1-800-ASK-USPS or online at www.usps.com.

Here are some tax tips from the USPS:

• On April 15, mail early in the day at any Post Office, station, branch or collection box.

• If depositing returns in a collection box on April 15, double-check the pickup schedule on the label. To ensure getting the April 15 postmark, deposit returns before the last scheduled pickup time.

• Stamped packages weighing more than 13 ounces must be presented in person to a post office clerk to comply with FAA regulations.

• Affix the appropriate postage, especially since the item may weigh more than an ounce. Have a postal sales and service associate weigh and rate the item for you. Tax agencies will not pay postage due and your short-paid return will be returned to sender — and you may miss the deadline (tip: 5 pages equals approximately one ounce).

• Furthermore, it is very important that your envelope has a return address. Short-paid items without a return address will be sent to the postal mail recovery office for determination of the sender, delaying its return.

• The USPS recommends getting the security of proof of mailing and proof of delivery of your tax returns — use certified mail service with a return receipt, plus the applicable postage.

• Tax forms are no longer available at post offices. Check at local libraries or online at http://www.irs.gov (Federal forms) or http://www.revenue.pa.gov (PA forms).

Remember that mail must be deposited before the last collection time at the post office or collection box on April 15 to receive an April 15th postmark.

The Postal Service does not receive tax dollars for operating expenses; it relies entirely on the sale of postage, products and services to fund its operations.