estimated tax voucher

when I went to print my federal forms I noticed four 1040-ES " Individual estimated tax voucher" all for approximately $2000. (On My estimated tax due sheet it shows $11,500 in estimated tax for 2021). If my research is correct they want me to pay that because I have a 2020year federal tax payment  of $9***.  The only reason it was so high is because of a Capital Gains Sale (app$61,000).

    1).  in 2019 I/we received a tax rebate. (app. $2000).

     2).   our 2020 earned income was about $7000 LESS than our 2019 earned income.

    3).  2019 Total income was $119,***      2020 Total income is $175*** (again the increase from the             sale/capital gains from  some investments).

We are not planning any sale/capital gains events for the year 2021.

We Expect our income  to be closer to our 2019 tax year income ($119***).  

I am worried that if I am "required" to pay the estimated tax It would be difficult AND we would just end up getting it back at the end of 2021anyway????

 

Am I required to pay the Estimated Tax?

If not how do I tell Turbo Tax and the IRS that I am not going to, so I don't get "in trouble" so to speak?

 

It is possible that my research MISSED a place where it said paying estimated tax is optional, if so could some one please direct me to that place. I like to make copies of these types of info to access later and to include in my records so I understand three, four, five years from now , how/why I made the decisions I made THANK YOU VERY MUCH!