What is Cost Basis?

Cost basis is the original value of a security or other asset used for tax purposes to determine whether a capital gain or loss has been realized when that asset is sold or disposed. Depending upon the tax regulations, the cost basis may be adjusted for commissions, wash sales or corporate actions such as stock splits and return of capital distributions.

In certain instances, IBKR may be required to provide you and the IRS with annual statements reporting the cost basis of securities you have sold. For more information, please see What is a Covered Security?

IBKR also offers tax-advantaged account types for clients who are U.S. citizen, such as IRA accounts. Please click here to learn more about these account offerings. 

Additional Information

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How do I update cost basis information for transferred securities via Free of Payment of Global Securities?
Why did the cost basis of my position change?
Tax reporting: Capital gains and losses
Why Form 1099-B shows that disallowed wash sale exceeds total loss?