For those of us who cannot resolve archive link.
Article https://www.bloomberg.com/news/articles/2024-02-22/this-exch...
Matt Levine's https://www.bloomberg.com/opinion/articles/2024-02-22/put-th...
Cloudflare blocks the extension to DNS that allows that. If you don't care, you can set your DNS to bypass Cloudflare for those domains only.
That being said, by "Cloudflare has issues with archive.is" I very literally meant that they have issues with the DNS records served to them by Archive.is. (i.e. They do not support EDNS.)
I can think of at least a few risks that one would not have with T-bills besides counterparty risk. You have management risk: they have said what their strategy is and what they will do, but what if they don't? I would also ask who is on the other side of these trades and how big that market is or can be. Alpha Architect's own explainer implies that box spreads can also be used to borrow money and that this might be cheaper for the borrowers than margin loans, which makes some sense, but it seems like a pretty esoteric instrument to use for that. Most of their argument is an appeal to the efficiency of markets, which might be true until it isn't. Finally, there's regulatory risk. They think this works under the current rules, but a regulator might disagree with that. If someone does not like it a sufficient amount the rules could be changed, just like there's already an exception for "original issue discount" that makes zero-coupon bond income like Treasuries count as interest income, not capital gains, even though no interest payments are ever made.
I'm not in finance, though, I'm just some guy, so take all of the above with a grain of salt.
For example, everything goes to shit if Rogers goes down so hard that no electronic payments of anything works; so maybe some percentage of an emergency fund should be literal cash on hand.
The returns supposedly track the short end of the yield curve on US Treasuries. That would make sense, as theoretically, the net premium of a box spread is equal to the net present value of the payout (under the no arbitrage assumption). That net present value should be very close to the yield on a zero-risk asset over the same time period. They're using 1 to 3 month options, so in theory, they get yield close to short-term US Treasuries (the market prices a near-zero probability of the US defaulting on its bonds in the next few months).
I haven't looked into the tracking error between SPY box spreads and the short end of the US yield curve. https://en.wikipedia.org/wiki/Box_spread#cite_note-2 says the yield averages about 0.35% above holding equivalent maturity US Treasuries.
Though, it sounds like they're using box spreads composed of American options, so I wonder how they deal with early exercise risk. You only get bond-like performance from a box spread if you don't have early-exercise risk. The further out of the money they place their strikes in the box spread to avoid early exercise risk, the lower the liquidity they get, and higher trading costs.
The tax trick is that they also enter into a delta-neutral trade on a high-value single stock. (They don't use and index for this part because they want the difference between the winning and losing parts of this trade to be as large as possible, so they want volatility in the underlying asset.) At certain points, they realize the losses on the losing half of that trade (reducing tax liability), and perform a tax-free in-kind exchange of units (shares) in their ETF for the winning half of that trade. Of course, they don't know in advance which half will win and which will lose, but it doesn't matter. The brokerage buying their ETF in order to make the tax-free exchange bumps up the price of the ETF, very close to the value of the winning leg of the tax-saving trade.
Note the several caveats above (and probably some I missed) in comparing with US Treasuries yield.
This is not investment or tax advice.
[1] https://www.bloomberg.com/opinion/articles/2024-02-22/put-th...
What about FDIC?
The section 1256 tax treatment is especially cool not so much because of the 60/40 taxation but because if you have several consecutive years of 60/40 gains you can edit your past year's income by incurring a current year loss and having a carryback loss.
There's a long thread on the Bogleheads forums about Box Spreads here: https://www.bogleheads.org/forum/viewtopic.php?t=344667