How do I file a lump sum settlement payment??

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Legal settlements that are taxable (including previously-deducted medical expenses related to physical injury or illness) are entered as miscellaneous (other) income.

Whether a settlement is taxable or not depends upon the type of settlement it is. The settlement type is usually listed on the Final Settlement Agreement.

This link explains how to enter taxable legal settlements into TurboTax:

https://ttlc.intuit.com/replies/3302162

This link explains more about how to determine if your settlement is taxable or not:

https://ttlc.intuit.com/replies/4787698