How do I file an amendment

[herbertreeves1563]

How do I show the mileage?

[xmasbaby0]

What mileage are you asking about?   Mileage driven for self-employment that goes on a Schedule C with other business expenses?  Mileage driven for medical appointments that goes under medical expenses?  Mileage driven as a volunteer for a charity that goes under your donations?  Mileage driven to the rental properties you own that goes on Schedule E?

Wait until your original return has been fully processed before you amend, and make sure you have saved a pdf of the original return before you amend. (If you do not save it as a pdf, the amended return will overwrite the original, and the original will be lost forever)

See this TurboTax support FAQ for amending a tax return -

CURRENT YEAR

https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-return/amend-federal-tax-return-curr...