A short box spread is another way to take a loan, except it is not from your broker, but from the options market. This essentially gives you the best borrowing rate that your broker will never beat, but you will need to trade fairly complex options spreads. [This blog post](https://thefinancebuff.com/short-box-spread-vs-margin-loan-fidelity.html) describes the process. I created [this video](https://www.youtube.com/watch?v=mSmY9HNzeAo) and [slides](https://docs.google.com/presentation/d/1-CDrMKt7snfninR7kycAI7HIv2nGCyVBD-ozjVqwVUc/edit?slide=id.p#slide=id.p) going into the mechanics.
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A short box spread is another way to take a loan, except it is not from your broker, but from the options market. It is a combination of a synthetic long and synthetic short. This essentially gives you the best borrowing rate that your broker will never beat. [This blog post](https://thefinancebuff.com/short-box-spread-vs-margin-loan-fidelity.html) describes the process. I created [this video](https://www.youtube.com/watch?v=mSmY9HNzeAo) and [slides](https://docs.google.com/presentation/d/1-CDrMKt7snfninR7kycAI7HIv2nGCyVBD-ozjVqwVUc/edit?slide=id.p#slide=id.p) going into the mechanics. [Here](https://youtu.be/IjVoQqNhsmM?si=tfZDomQMdVoOLbN4) is another good video about how this works.
[Boxtrades](https://www.boxtrades.com/) is a good site for figuring out the trade to enter. You can even combine this with a forex carry trade to take the loan in another currency with lower interest rate, but you will need to be able to trade options in non-US markets (e.g. [SMI index](https://www.six-group.com/en/market-data/indices/switzerland/equity/smi.html) for CHF).