How much can I afford to pay in rent?

[Cubswin]

You calculations assume interest rates dont move... correct?

[dcasper70]

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You calculations assume interest rates dont move... correct?

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Absolutely no assumption at all.
In a 4 year comparison, I GARANTEE interest rates don't move.

By definition, the rate in a 5/1 ARM doesn't move for 5 years.
Should I also define 30yr FIXED.....???