It costs money to buy a put contract to protect the loan.

So if you need a 1mil loan, now you also gotta buy puts that'll protect a downturn of 1mil. So now you gotta sell stock which will be taxed. It's less than 1mil so you're taxed less, but you will have taxes.

Edit: you could zero cost collar (puts + covered calls) your investment to protect it's current value, but you'll give up potential gains as well to get the zero cost part. But this would be a way to protect the value without selling. If the options get exercised though, you'd then have some taxes to pay.