I entered a mock return in TurboTax desktop to try to recreate the error you are seeing, but could not do so.
My test case had over 90% of the income earned after 8/31/25 and all of the itemized deductions claimed before 8/31/2025, but did not get an error.
You may want to check your entries for Schedule 2210 AI to be sure that none of the entries for line 4a, 4b, or 4c, exceed the amount on 4d.
If you aren't able to resolve this, you could send a screenshot and any other details you wish to share about the issue in a response - just be sure that none of your personally identifiable information is present in the screenshot.
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