Why do you say you don't owe? If you added a W-2 you added income. Higher income generally means higher tax liability.
If you had a refund on your original return and should have had a smaller refund, then you would have to pay some of it back.
Basically, the amended return is making up for any additional refund you received that you should not have due to having more income as well as adding any additional taxes that you would owe with the additional income.
Ex. If you received a refund of $2,000 without your additional W-2, but if you would have added the W-2 on your original return, you would have owed $150, you would now on your amended return owe $2,150.
Before you amend, be sure your previous return was fully processed as the IRS does frequently catch missing forms and will send you a letter of correction and adjust your refund or amount due based on the information they have. If your return was already processed, and it is showing a tax due, it is best to pay as soon as possible to avoid additional interest and penalties.
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