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I just went to the IRS site to pay my Estimated Taxes. There's no 2021 Tax Year in the dropdown menu, just 2022. So I guess it's too late to pay IRS Estimated Taxes for 2021. 

 

But on the FTB (California) site, I can select 2021 for Estimated Taxes, so I guess I can pay it for CA. 

 

Is there a problem if I pay the rest of my Estimated Taxes for California, but not for IRS? Should I just skip it for both, and pay it as part of my income tax payment?