cost basis step up on death of joint owner

Owner passes away who had a joint stock account with spouse.

Am I correct in stating that the stepped up cost basis is the date of death value of the owner divided by two?

Example: bought stock at 100 per share. Now is 200. Owner passes and new step up for joint owner (spouse) would b 150 per share?

or

does she get the step up of 2oo per share?

Thank you,
Douglas



Yes, 150 per share, but that is not the date of death basis/2. It is the total of the purchase cost plus the DOD value/2. This assumes a NON community property state.



What if they held the account as tenants in common?  Would it still be $150 per share?  Or would it be $100 a share for half of the shares and $200 a share for half of the shares, as if they each owned half of the shares?



I believe that the TIC share would need to be determined, since this would not be qualified joint property. The decedent’s interest would get the basis adjustment. 



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