People use leverage all of the time for home loans, and it is not unheard of to use a 80% loan to value ratio for a mortgage. For a $500k home, you might put up $100k cash and take a $400k loan. You would likely do this at a reasonable interest rate, and your hope is the value of the home goes up faster than your interest charges. Your home value could fall, leaving you with a mortgage that is underwater, i.e. you owe more than the home is actually worth. All of this can apply to investing as well. Using a 30% LTV for investing seems perfectly reasonable to me.
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Forum threads:
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- [Lifecycle Investing - Leveraging when young](https://www.bogleheads.org/forum/viewtopic.php?t=274390)
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Books:
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- [Lifecycle Investing: A New, Safe, and Audacious Way to Improve the Performance of Your Retirement Portfolio](https://www.amazon.com/dp/B003N44KOM/)
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### Margin loan
When you have stocks, brokers will let you take a margin loan of at least 50% or more of your equity value. This gives you at least 1.5 leverage, at the cost of margin loan interest, which is usually terrible at most brokerages. For example, Schwab will charge you 13% interest as of today (June 2025). If you cannot make more than 13% on the investments you do with leverage, you won't even break even. Interactive Brokers will give you a much better rate, for example 5%. This is an easier number to beat on investment return.
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> The second cash sweep that will happen actually happens overnight. You will see this listed as "Cash Sweep" in ThinkorSwim. This overnight sweep is used to get the futures cash balance high enough to cover the exchange's initial requirement which is posted by the CME. As of today, for /MES the exchange initial requirement is 2,412.3 per contract for longs, however this does change every day. The overnight sweep moves the cash, so the futures cash balance equals the exchange initial requirement.
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Some useful threads:
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Forum threads:
- [How do rolling and margin on futures trading work?](https://www.bogleheads.org/forum/viewtopic.php?t=300111)