Um...you do not have to wait for a notice from the IRS. You can see how much you owe on line 20 your 1040X and can pay it when you mail the tax return. You can enclose a check or money order with the tax return or you can pay it on the IRS site:
https://www.irs.gov/payments
From the IRS
Line 20—Amount You Owe See the “Amount you owe” section in your income tax return instructions or go to IRS.gov/Payments for payment options. If you elected to apply any part of an overpayment on your original return to your next year's estimated tax, you can’t reverse that election on your amended return.
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