Procrastinators, take note: Tuesday is Tax Day, the last day to file income tax returns. This year's due date is April 17 because April 15 fell on a weekend, followed by a holiday, DC Emancipation Day, reports the Colorado Department of Revenue. Unless someone has filed for an extension, any mailed tax returns must be "properly addressed, postmarked and deposited in the mail by the due date," the IRS advises. Some tax changes took effect in January. In the last days of 2017, the El Paso County Treasurer's Office was inundated with an unprecedented number of residents prepaying their 2017 taxes. Under the Republican-sponsored tax bill, the cap for itemized state and local tax deductions was set at $10,000 Read more on Colorado Springs Gazette