The sooner you start making payments, the less you will pay in total interest. The IRS will accept your money before they process your return. You can choose your method at Payment plan options. A bank draft is the cheapest and easiest.
You can file the 1040x without adding a check. In fact, I would not enclose a check, just do the payment plan.
Make sure that you mail the amended form with tracking to ensure the safe arrival of your confidential information.
The IRS just finished processing all 2020 returns a month ago from the main year, unemployment changed to nontaxable for the first $10,200 and economic impact payments. Covid threw everything off, including the IRS.
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