The clock is ticking, and last-minute tax filers have just three days to finish and mail off their 1040s.
With the annual tax deadline looming at midnight Monday, both the Boulder Post Office downtown at 1905 15th St. and the High Mar Post Office at 4985 Moorhead Ave. will be open regular hours Saturday, 10 a.m. to 2 p.m. and 10 a.m. to 1 p.m., respectively.
Both also will be open from 7:30 a.m. to 5:30 p.m. Monday.
The Valmont Post Office at 2995 55th St., will be open its regular hours, 9:30 a.m. to 2:30 p.m., on Saturday.
It also will be open from 8 a.m. until 7 p.m. Monday -- the only location in Boulder with late tax mail collection on April 15.
For those waiting until the literal eleventh hour to file their taxes, the Denver General Mail Facility Post Office, at 7500 E. 53rd Ave., in Denver, will be open until midnight Monday.
David Rupert of the United States Postal Service set out tips for filing and sending taxes at the last minute to ensure they get to the correct location on time:
Place the correct postage on the envelope; a regular No. 2 envelope costs 46 cents for the first ounce for first class.
Either add extra postage or take your tax forms to the post office if you don't know what the correct postage should be.
Check the IRS website for the correct address to send your forms.
If you can't file your taxes before April 15, take them to the Valmont location for a late tax mail collection.
Those who file their taxes near April 15 can labeled as lazy or as procrastinators. For some, though, filing taxes at the last minute is a necessity.
Carly Mangles falls into the second category. Because her income comes from rental property in California, Mangles has been sending her tax forms back and forth to her tax preparer in that state over the last few weeks and dropped off her final forms at the post office on Friday.
"It's been a process," Mangles said. "I just got everything together today so I wanted to send it."