If she is used to getting the Earned Income Credit then you are going to be very surprised when you file a joint return this year ... when completing a new W-4 form for your employers you must use the multi income section to compute the correct withholding.
Try these tools:
http://www.irs.gov/Individuals/IRS-Withholding-Calculator
https://turbotax.intuit.com/tax-tools
http://turbotax.intuit.com/tax-tools/calculators/taxcaster
If you are using the downloaded program you may want to complete a couple of "what if" or "test" returns to see what filing jointly will look like for you this year...
If you want to play around
with different figures and tax scenarios without affecting your original return
you can
>>>In the TurboTax CD/Download software by creating a test copy:
1. Open your return
in TurboTax.
2. From the File
menu, choose Save As.
3. Give the copy a
new name to distinguish it from the original (for example, by adding
"Test" or "Example" to the file name).
4. Click Save.
You are now safely working in the test copy and anything you do here will not
affect the original.
https://ttlc.intuit.com/questions/1900642-how-to-make-a-test-copy-of-your-return
>>OR use the WHAT
IF tool:
- Click Forms Icon (upper
right of screen) or Ctrl 2 (forms view)
- Click on the Open Form
Icon
- In the “Type a form name.” area
type What-If (with the dash), click on the name of the worksheet - click on
Open Form
- You will see the worksheet
on the right side of the screen; enter the information right into the
form
- To get back to interview
mode - click on the Step-by-Step Icon (upper right of screen) or Ctrl 1
Just got married? How
will it affect your taxes? You'll have to choose a tax filing status, adjust
your withholdings, and coordinate tax-favored benefits at work.
Info on Getting Married…..
http://turbotax.intuit.com/tax-tools/tax-tips/Family/Getting-Married/INF12006.html
Is it better to file Joint or Separately?
https://ttlc.intuit.com/questions/1894449-is-it-better-for-a-married-couple-to-file-jointly-or-separ...
