subject: Planning a home loan, Know the terms [print this page] Under a home loan Bank/ HFIs fund only around 80% to 85% of the cost of the house. The remaining 20% to 15% has to be borne by the customer himself. This amount paid by the customer out of his own pocket is called the Margin or also the Own Contribution towards the cost of the house. The Margin amount is subject to the eligibility of the individual.