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Follow these instructions from the FAQ Where do I enter my estimated tax payments?: If you made estimated or quarterly tax payments in 2025 toward your federal, state, or local taxes, enter them in the Estimates and Other Income Taxes Paid section. Navigate to the estimated tax payments section: TurboTax Online/Mobile: Go to estimated tax payments (< click here) under Deductions & Credits. TurboTax Desktop: Go to the Federal Taxes, then Deductions & Credits. Select Estimates and Other Taxes Paid. Select Start or Revisit next to the type of estimated tax payment you'd like to enter under Estimated Tax Payments. Enter the amount of estimated tax you paid at each of the quarterly due dates. If you paid 2025 estimated taxes in 2025, you'll enter just one amount for each state or locality. Learn more about filing an amended return using TurboTax (FAQ): What should I know before amending my return? Here are some things to know before you begin: Make sure you really need to amend. Wait until your return has been accepted (or mailed if paper-filing). Use the same TurboTax account you used to file your original return. Once you begin your amendment, you'll see your original return. Only make changes to the areas of your return that need amending. The refund calculator will start new at $0 and only reflect the changes in the refund or tax due. Any changes you make to amend your federal return will automatically be transferred over to your state return. What if I haven’t finished filing my original return? If you haven't filed yet, you don't need to amend. Just continue working on your return and make whatever changes you need before filing.