With under 20% down, conventional loans add private mortgage insurance. See the monthly cost and how many years until you reach 20% equity and it falls away.
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Your PMI
Monthly PMI
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PMI can be cancelled at 80% loan-to-value (20% equity) and ends automatically at 78%. This estimates the months to 80% equity from scheduled payments alone; extra payments or home appreciation get you there sooner. PMI rates vary with your credit and down payment.