If you have overpaid your taxes, when you file a tax return you can elect to have the overpayment refunded or applied to cover future taxes. Generally, once you make a decision it is final and you can’t go back and change your mind. However, due to COVID-19 and the extended July 15th deadline, taxpayers who have already filed their 2019 tax returns and elected to apply any overpayment of taxes to the future get a reprieve. By filing a superseding tax return, you can elect to get a refund of any overpaid taxes instead of applying them to a future year. There is a deadline to file a superseding tax return which depends on your unique circumstances. However the deadline could be as soon as July 15th, so don’t delay if this applies to you.
More information can be found at Taxpayer Advocate - Superseding Tax Return.