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The fact that you accrue interest means that your loan will grow, which means it will take longer to pay it off. But most people will never pay it off in full within the thirty-year time frame anyway. However large your loan becomes - if it were to grow to PS100,000 with interest - you still only pay off 9 per cent above the threshold each year. That is why unless you are earning a lot of money you don't need to worry too much about interest charged, because you only pay off what you can within thirty years.