Loan-to-value (LTV) is the loan balance on a property divided by that property's value, written as a percentage. It is the single ratio a lender looks at to decide your rate, whether you owe mortgage insurance, and how much cash you can take out when you refinance.
The lower the number, the more of the property you actually own and the less risk the lender carries if you stop paying. A $150,000 balance on a $250,000 property is 60% LTV. The same balance on a property worth $180,000 is 83% LTV, and that gap changes everything about what a bank will offer you.
In practice
Say you buy a duplex for $340,000 and put $85,000 down, so you borrow $255,000. Your starting LTV is $255,000 ÷ $340,000, which is 75%. Three years later you have paid the balance down to $240,000 and a nearby sale puts the duplex at $380,000. Your LTV is now $240,000 ÷ $380,000, or about 63%.
That drop matters when you go to borrow against it. Most cash-out refinances on a rental cap out around 70% to 75% LTV, so on a $380,000 value a lender might let the new loan reach $266,000 to $285,000. Subtract the $240,000 you still owe and you could pull roughly $26,000 to $45,000 in cash, before closing costs. Run the same property at 83% LTV and there is nothing to pull.
Why it matters to a small landlord
LTV sets the price of your debt. Investment-property loans already carry higher rates than a primary residence, and a high LTV pushes them higher still, because the lender is exposed if values dip. Cross 80% on a conventional loan and you usually pick up private mortgage insurance, a monthly cost that buys you nothing. Knowing your LTV before you apply tells you whether a refinance is even worth the appraisal fee. For the full picture, see how a cash-out refinance on a rental works and how lenders set investment property mortgage rates.
The catch is that LTV moves on two axes you only partly control: the balance, which you pay down on a schedule, and the value, which the market and your appraiser decide. A soft appraisal can quietly raise your LTV and shrink what you can borrow.
LTV is really a mirror image of your equity: a 70% LTV means 30% equity. It is what triggers private mortgage insurance above 80%, and it is the number that gates every cash-out refinance you will ever run. Watch it, and you will know your options before the loan officer does.