It takes approximately 14 weeks to process an amended return. Therefore, if you are on an installment agreement, it is suggested that you continue with the terms of the agreement until the 1040X is processed. Otherwise, you may be subject to enforcement actions.
Or, you can contact the Internal Revenue Service at 1-800-829-1040 to inform them that the 1040X is pending. They may annotate your file to prevent any enforcement actions from being taken if you choose to default on your agreement.
If you are not on an official installment agreement, then you have a choice of making payments. However, once a final notice is received and the Form 1040X has not been processed, you should make arrangements to pay the tax.
Any over-payments on your account will be refunded to you once the Form 1040X is processed.
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