The tax season is officially open. Monday, Jan. 27 is the first day you can file your returns. They may not be due until April 15, but getting a head start will get you a quicker refund. Or give you more time to save if you owe the Internal Revenue Service (IRS) some cash.

Tax deductions, tax credit amounts, and some tax laws have changed since you filed your last federal income tax return.

Here's a look at key dates in the tax filing season, including deadlines to file, when to request extensions and how long until you get your refund.