I have the same security within a qualified retirement account (IRA) AND a separate brokerage account. Changing the security to tax-exempt causes all dividends, regardless of account, to be tax-exempt in Tax Reports…
Preferably, if an account's type is IRA (traditional, Roth, 401k, etc.) than all dividends within should be tax-exempt. and … if the same security is in a Brokerage account then all dividends should be considered taxable (or at least the choice should be available)… The choice should be based upon the account type, not the specific security or ticker symbol.
Since the transactions are downloaded from brokerage accounts online, the ability to choose Ticker Symbols isn't assignable or re-assignable.
TIA