No, you are not mailing the return, however you will mail the copy of the 1098-C (keep your original for your files) and Form 8453 will print when you finish your return. Form 8453 is used for tax returns that are filed electronically and yet the IRS wants to see some pieces of data on paper. The suggestion is to send it with delivery confirmation or certified mail so that you have proof it was sent to and received by the IRS. See the details below.
If you don't see a difference in your refund it may be that itemized deductions are not being used. I would suggest you print and review your tax return before filing (Schedule A for itemized deductions). You have access to all forms when you choose to print your return in TurboTax Online/Mobile. However you are required to pay before printing, but do not have to file until you are ready.
If you are using TurboTax Desktop you can switch to Forms and review all forms and worksheets.
If you are e-filing your tax return, then mail your statement (1098-C or other document showing detailed sales information) along with Form 8453 to:
Internal Revenue Service
Attn: Shipping and Receiving, 0254
Receipt and Control Branch
Austin, TX 73344-0254
If you need a blank Form 8453, you can download this pdf, enter your address information and check the box for Form 8949 (this form is really just a cover sheet).
@rbaron
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