You are paying more money when you add the W-2 because the amount in box 1 gets added to all your other income and the tax is computed on that. Then all of your withholding is subtracted. Multiple W-2s often result in more tax. Withholding is somewhat inexact when income from several sources is involved. Her wages are taxable, just not for Social Security. <a rel="nofollow" target="_blank" href="
https://ttlc.intuit.com/questions/2273878-why-did-my-refund-drop-when-i-entered-another-w-2">https:/...>
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