The size of your loan compared with the value of the property.
LTV is the loan balance divided by the property's value, expressed as a percentage. Lenders use it to gauge risk: a lower LTV (more equity) means better rates and no PMI, while a high LTV signals more risk. Reaching 80% LTV is the common threshold for dropping PMI.
A $320,000 loan on a $400,000 home is an 80% LTV.