December 9, 2021
Last month, I published Part 49 of my Safe Withdrawal Rate Series, dealing with leverage in retirement. In that post, I surmised that the cheapest form of leverage likely comes in the form of a margin loan in an Interactive Brokers (IB) account. If you have the IB Pro account you have access to loan rates tied to the Federal Funds Rate plus a tiered spread ranging from 0.3% to 1.5%. Though, the really low rates don’t start until your loan reaches at least $3,000,000. For more manageable loan amounts that the average retail investor would use, we’re looking at a higher spread: 1.50% spread for the first $100,000 and 1.00% over the Fed Funds Rate for the next $900k. With the current effective Fed Funds Rate at around between 0.08% and 0.10%, that’s a very competitive rate. Certainly better than a Home Equity Line Of Credit (HELOC).
In the comments section, though, a reader brought up an idea for an even lower-cost method for borrowing against your assets: an exotic options trade called a “box spread”. I had heard of this trade before but never put much thought into it. And I certainly didn’t put any money into that idea. But just for fun, I researched this trade some more and even initiated one box spread trade on Monday, essentially issuing a synthetic $20,000 zero-coupon bond maturing in December 2026 at a very competitive interest rate, significantly lower what you’d get from IB.
So, in today’s post, I like to go through the basics of the Box Spread, how to implement it and how this trade could in fact give us a cheaper form of leverage than even the rock-bottom rates from IB. Let’s take a look at the details…
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