Banks consider a number of factors when calculating your existing commitments. These include:\r\r\r Existing loans: Most lenders may use the actual repayments for your current mortgages and loans. However, some may use a higher assessment rate.\r\r Credit Cards: Even if you may not use some of your credit cards, most lenders will assess all of your credit cards as being fully drawn. They will then use 2% to 3% of the credit limit as a monthly repayment in their assessment. There are a select few banks though that can ignore credit cards that are not used or that are paid off in full each month.\r\r Personal Loans: Most lenders will use the actual personal loan repayments.\r\r Rent-free with parents: With most lenders, living rent-free with parents will have no effect. Some lenders allow for $150 per week as a rent expense in case you need to move out of home.\r\r\r\rNote that some banks may lend you more even if you have several mortgages, or credit cards that you arent using.