Monthly payments typically include more than just the loan payment!

If your down payment is less than 20% then your monthly payment typically includes: PITI... The principle and interest amounts; Property Taxes; Home Insurance and typically Private Mortgage Insurance. 

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Note: There are different kinds of mortgage loans. If you have an Adjustable-Rate Mortgage ("ARM",) your payment can go up or down according to your agreement. ARM's typically have adjustment periods where your payment can adjust up or down, so you can plan for and predict any changes, ARM's also usually have adjustment caps to limit the amount of any individual increase as well as the overall increases.