If you have any investment accounts there is a possibility that you won't receive your 1099s until mid-February (or later). If you have already filed a return and later receive a document that needs to be included with your tax return, you will need to amend. Unfortunately amending a return is required to be filed by paper (no e-file available) and will take 8-12 weeks to process, possibly longer during peak season.
So, bottom line for February, make sure you have all your documents before you go see your preparer (ME!). Have an excellent end to January and wonderful start to February!