Get your taxes done using TurboTax

Not so sure what you are thinking when it comes to "year round"--the software for the next tax year--2017--will become available in late November.  Tax filing deadline for 2017 taxes is in mid-April 2018.  Unless you plan to file late every year.
Entering information from pay stubs is not a good way to prepare your tax return,  The information from your pay stubs will not actually match the W-2 you get from the employers.  Your employers should issue your W-2's by the end of January, and anyone who will be issuing a 1099Misc should also get it to you by the end of January.  Certainly it is a good idea to save your pay stubs and keep accurate records, especially for contract work.  And keep records of expenses you have when you perform contract work.  There is not an effective way to enter that information into tax return software "year round."  If you are doing lots of independent contract work, @VolvoGirl  has some great tips to offer.
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**