Comment by sam_palus

Agreed, QSBS is too valuable to be cavalier about.

The active business asset test is about "intent and substance" and not balance sheet line items. I think it's very clear in this case that you'd be using it as a cash equivalent, since floating-rate agency MBS have a comparable risk profile to money market holdings (short duration, government-backed, highly liquid). And economically they're serving the same function: parking working capital safely until your business needs it. And frankly, I think accessing those assets through a treasury management platform, rather than a brokerage account, helps establish intent and substance.

That's my view on it at least, and I know many companies use these assets for long-term cash without issue. But I'm not a tax expert.

I do really appreciate you bringing this up though, and I'll reach out to our tax lawyer to get a proper written opinion we can share with our customers. Of course it's not a replacement for getting your own tax advice, but I think it'll be helpful regardless.