Understanding Mortgage Down Payment Requirements. The next part of buying a house, after you’ve been approved, is gathering the downpayment and proving it to the bank. The minimum downpayment can be anywhere between 5%-20% of the total price of the house. Basic guidelines for proving your downpayment:It must be proven by 3-6 months of bank statements … Continue reading How To Buy A House (2/5) – The Downpayment