This pop up is asking about your 2020 state tax payments. If you completed your 2020 CA state return in TurboTax you can sign in to your account and print/download your 2020 return. Be sure to select all forms/worksheets.
Look for the "Federal Carryover Worksheet." On that worksheet you will find the CA "Total withheld/payments" amount requested.
If CA was the only state you paid taxes to in 2020 and you itemized, you could also find your Federal Schedule A and use the line 5a amount plus any amounts paid with a CA extension if applicable.
You can also total the amounts in box 17 for CA on your 2020 W2s and add in any quarterly payments to CA in 2020 (if any) and if you filed a CA extension for 2020 and made a payment with that extension you would add that as well.
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