A fundamental question is how much leverage you want to use. You can easily bankrupt yourself, and unfortunately brokerages make this all too easy. I prefer the leverage amount of 1.3. For example, if I have $100k cash, I will use that to invest $130k in a diversified portfolio. The key is diversified, because you want to be able to ride out the downswings.
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### USD margin loan
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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. It must have been nice during the [ZIRP](https://en.wikipedia.org/wiki/Zero_interest-rate_policy) era, but those days are gone for now.