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Tiny variations can add up to big differences in your monthly payment. When in doubt, be conservative. For instance, if you do not know exactly how much interest you are likely to pay, estimate your interest a little high. If you do not know exactly how large a down payment you will be able to put down, estimate the amount a little low. Experiment with the loan calculator, entering a longer or shorter loan term, a higher or lower interest rate, more or less of a down payment, and so forth.