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2 replies

Level 15
March 5, 2025

You provide that value based on your records or research. 

DawnC
Employee Tax Expert
Employee Tax Expert
March 5, 2025

Cost basis is the original purchase cost of an asset (such as stocks, bonds, or property), plus any adjustments that result from transactions over the period you own the asset.   If you know when the stock was purchased, here are some tips to help you find the original basis.