get the spouse's tax basis in those stocks
Basis of property received. Your basis in property received from your spouse (or former spouse, if incident to your divorce) is the same as your spouse’s adjusted basis. This applies for determining either gain or loss when you later dispose of the property. It applies whether the property’s adjusted basis is less than, equal to, or greater than either its value at the time of the transfer or any consideration you paid. It also applies even if the property’s liabilities are more than its adjusted basis.
This rule generally applies to all property received after July 18, 1984, under a divorce or separation instrument in effect after that date. It also applies to all other property received after 1983 for which you and your spouse (or former spouse) made a “section 1041 election” to apply this rule. For information about how to make that election, see Temporary Regulations section 1.1041-1T(g).
