I'm not sure how to change my situation. I can certainly look at what happened in 2014, but I was sort of hoping there would be an "if this then that" type of logic path to follow. Like, if you make x dollars, choose this thing to be withheld.
I make $55k/year and my wife makes about $12k/year. I live in KY but work in OH and she lives and works in KY. This is one area where I just have no clue what things are relevant to tell others so they can help me. I'll check out the link someone posted, but if there are more specifics someone could give apart from "look at your taxes last year" I would appreciate it.
I was more suggesting you should look at how your 2014 taxes were calculated and see what applies to 2015 as a starting point.
Alright, let's look at the federal 2015 taxes for your scenario. I'll be assuming you will file married jointly, have no kids, will only be claiming exemptions for yourself and your wife, and use the standard deduction instead of itemized. I'll also be assuming no pre-tax deductions (e.g. 401k, health insurance, state income tax).
First we'll figure out what your actual 2015 tax liability should be so that we have a target.
Gross income: $67k
Standard deduction: $12.6k
Exemptions: $8k
Taxable income: $46.4k
Tax liability: $6,037.50Now let's take a guess with the W-4 and see how it comes out. Because your incomes are so different I'm going to guess yours can be withheld as married and then set your wife's to the single brackets.
Husband W-4:
1 allowance, withhold as married
$55k - $12.6k (married standard deduction) - $4k (1 allowance) = $38.4k taxable
$4,837.5 will be withheld
Wife W-4:
1 allowance, married withhold at single rate
$12k - $6.3k (single standard deduction) - $4k = $1.7k taxable
$170 will be withheld
Total withheld from both paychecks for the year: $5,007.50. Okay, we missed our target by $1,030. Using these W-4s your wife's marginal tax rate 10% and yours is 15%. So if we drop both allowances to 0 that will withhold an additional $1000 (4000 * (.10+.15)). That gets us within $30. Now you will have to use the additional amount field. If you have something like 26 pay periods putting "$1" in additional amount field will get you about as close as you can expect. Let's run through the revised W-4s:
Husband W-4:
0 allowance, withhold as married, $1 additional (26 pay periods)
$55k - $12.6k (married standard deduction) = $42.4k taxable
$5,463.5 will be withheld
Wife W-4:
0 allowance, married withhold at single rate
$12k - $6.3k (single standard deduction) = $5.7k taxable
$570 will be withheld
Total withheld from both paychecks: $6,033.50. Of course, don't just go using this example W-4 exactly, as you'll need to adjust for any pre-tax deductions. And since we are already most the way through 2015 you would need to look at how much has been withheld already and compensate for that if it is too low or too high. I'll be happy to rerun calculations if you provide more specific information.
I'm not sure of your specifics with state tax. Do you know which state's taxes you are paying or are you asking for help with figuring that out?