Hello – I have made trades in 2021 whereby in the same trade I have bought and sold shares in taxable and IRA accounts – Interactive Brokers has the facility of creating an advisor account whereby one can link taxable and IRA accounts to the advisor account, and then one can place orders against the advisor account which splits the trade to the linked accounts. So a trade to buy 100 shares of X would be split across a taxable account, and a IRA account as 50 shares of X each. Usually the trade executes at the same instant, and will close at the same instance (if at a loss, since the stoploss on the order is also the same).

If position X is closed out in both the taxable and IRA account at the same time because a stop-loss was hit within 30 days of opening the position, does this constitute as a wash sale in the IRA that disallows the loss in the taxable account? If I understand this comment on this same topic correctly, https://irahelp.com/comment/52957#comment-52957
my shares in the IRA dont constitute as replacement shares because they were opened and closed at the same instant as the Taxable account, but wanted to understand.