Ring signatures are unwound when the tax authorities require you to provide your password to justify your tax basis.
Use more than 1 wallet? Plausible deniability is such a nice toy. And why password? Give them a viewkey to whatever wallet you want to have exposed. Ideally you can even password protect a wallet with different keys who then unlock whichever viewkey you want to release, like the hiddenos feature of safeguard and truecrypt.