Loan-to-value is your debt as a share of the property's value. It's the number lenders use to size loans, and the number you should watch to know how much cushion stands between a market dip and being underwater.
How it's computed
LTV = loan balance ÷ property value. A $210,000 loan on a $300,000 property is 70% LTV. Portfolio-wide LTV works the same way: total debt ÷ total value. As you pay down principal and the property appreciates, LTV drifts down; a cash-out refinance pushes it back up.
What lenders allow
For investment properties, US lenders commonly cap purchase loans at 75–80% LTV and cash-out refinances around 70–75% — tighter than the 95%+ available on owner-occupied homes. Lower LTV usually buys a better rate, because the lender's loss risk in a foreclosure drops sharply once there's a real equity cushion.
Reading your own LTV
Under 60% is conservative — lots of trapped equity, low risk. 60–75% is the working range for most active investors. Above 80% on a rental, you are one soft appraisal away from being unable to refinance and one downturn away from owing more than the property is worth. Remember the denominator is an estimate: LTV is only as honest as the valuation behind it.
Worked example
You bought a fourplex for $400,000 with a $300,000 loan (75% LTV). Three years later the balance is $285,000 and comparable sales suggest $460,000. LTV = $285,000 ÷ $460,000 = 62%. A lender allowing 70% cash-out would refinance up to $322,000 — roughly $37,000 of tappable equity before costs, if the new payment still covers.
When this rule of thumb breaks
LTV says nothing about cash flow: a 50% LTV property with negative cash flow is still a monthly problem, and DSCR — not LTV — is often the binding constraint on a rental loan. Values are also cyclical: an LTV computed at a market peak flatters you exactly when caution matters most. In thin markets where appraisals swing widely, treat any single valuation — and the LTV built on it — as a range, not a fact.