I think you mean that the IRS calculation is on the W-4 that you gave to your employer.
If you've prepared a W-4 and still owe substantial taxes, you may have misunderstood how to post the form.
If you have multiple incomes, your taxes will go up rapidly.
Taxes start at 10% and go up to 37%. I'll show fewer tax brackets for simplicity.
For Married Filing Jointly
$0 to $22,000 - 10%
$22,001 to $89,450 - 12%
$89,451 to $190,751 - 22%.22
If your married and both of you work.
You both have taxable income of $50,000.
You get taxed at 10% for $22,000 = $ 2,200
And at 12% for the next $30,000 = $3,600
Your spouse is taxed 12% in $37,450 = $4,497 (the balance in the 12% bracket
Finally she will pay 22% on the last $12,550 = $2,761
For a total tax of $13,048
The W-4 has to show how the income accumulates, and must be complected for all sources of income.
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