When you make your quarterly Federal tax payments, if they are made under your social security number and are posted for tax year 2020, the IRS should automatically adjust your account. You can expect to receive a Letter from the IRS advising you that there are estimated payments on your account that need to be verified so they can issue a refund or apply them to your tax return.
You can also amend your tax return in TurboTax online. Log in to your account, open the tax return you already filed, and click on the link to amend your return. You can add the estimated federal tax payments in Deductions and Credits, Estimated Tax Payments, Federal estimated taxes for 2020 (Form 1040ES).
