inhibitor - a substance that retards or stops an activity. substance - a particular kind or species of matter with uniform properties; shigella is one of the most toxic substances known to man. angiotensin II inhibitor - an agent that retards or restrains the action of angiotensin II. antioxidant - substance that inhibits oxidation or inhibits reactions promoted by oxygen or peroxides. anticatalyst - (chemistry) a substance that retards a chemical reaction or diminishes the activity of a catalyst.
Amended returns typically take 8-12 weeks for the IRS to process, so you should wait at least 8 weeks before checking on the status of your tax refund. If it has been over 12 weeks since you filed your amendment and you have not received your refund, you should call the IRS at 1-800-829-1040 and speak to a customer service representative.
If you were owed a refund on any of those prior year tax returns, you can only collect it if you file the return within three years of the original tax deadline. Keep in mind that the IRS will expect you to pay any amount you owe.