When you take a HELOC or a second mortgage, one number decides how much you can borrow: CLTV. It’s the ratio lenders use to measure all the debt on a property at once, and it’s what caps your equity access.
Understand it, and you can calculate your available credit before a lender does.
LTV vs CLTV
Loan-to-Value (LTV) measures a single loan against the property’s value:
LTV = Loan Amount ÷ Property Value
Combined Loan-to-Value (CLTV) measures all loans on the property against its value:
CLTV = (All Loans Combined) ÷ Property Value
The difference matters the moment there’s more than one loan. Your first mortgage has an LTV. Add a HELOC, and together they have a CLTV. Lenders cap the CLTV, which is what limits how large your second loan can be.
Why CLTV Governs Second Loans
A HELOC or second mortgage sits behind your first mortgage in priority. If the property is ever foreclosed, the first mortgage gets paid before the second sees a dollar. That makes the second loan riskier for the lender — so they limit total debt against the property, not just their own piece.
That total-debt limit is the CLTV cap. It’s why your available HELOC depends not only on your property’s value, but on how much you already owe on the first mortgage.
A Worked Example at Every Tier
A property worth $450,000 with a first mortgage of $270,000. The first mortgage alone is at 60% LTV. Here’s what different CLTV caps allow:
| CLTV Cap | Max Total Debt | Minus First Mortgage | Available to You |
|---|---|---|---|
| 75% | $337,500 | −$270,000 | $67,500 |
| 80% | $360,000 | −$270,000 | $90,000 |
| 85% | $382,500 | −$270,000 | $112,500 |
| 90% | $405,000 | −$270,000 | $135,000 |
Read across one row. At an 85% CLTV cap, total debt can reach $382,500. You already owe $270,000, so your available HELOC or second loan is $112,500.
Notice how much the cap matters. Moving from 75% to 85% CLTV nearly doubles what you can borrow on this property — from $67,500 to $112,500. When comparing lenders, the CLTV cap is one of the most consequential numbers, because it directly sets your borrowing ceiling.
How to Calculate Your Own
Three steps:
- Find your property’s current value. An appraisal is definitive, but recent comparable sales give a working estimate.
- Multiply by the CLTV cap. If a lender allows 85%, multiply value by 0.85. That’s your maximum total debt.
- Subtract what you owe. Deduct your first mortgage balance. What remains is your available line.
On a $450,000 property at 85% CLTV with $270,000 owed: $450,000 × 0.85 = $382,500, minus $270,000, equals $112,500 available. Simple once you know the cap.
What Moves Your CLTV Room
- Paying down your first mortgage increases the gap under the cap — more room for a second loan.
- Rising property value raises the ceiling, since the cap applies to a larger number.
- A higher first-mortgage balance shrinks your room. If you recently did a cash-out refinance, less CLTV space remains.
- The lender’s cap itself is the biggest variable. Shop it — investment-property CLTV limits vary meaningfully between lenders.
CLTV on Investment Property
CLTV caps are generally lower on investment properties than on a primary residence. Lenders view non-owner-occupied real estate as higher risk, so they allow less total leverage against it.
This is why an investor HELOC often permits less borrowing than a homeowner HELOC on an identical property value. It’s not arbitrary — it reflects the risk difference between a home someone lives in and one they rent out. Our investor HELOC page covers the specific CLTV limits available on investment property.
Using CLTV in Your Planning
Before counting on a HELOC or second mortgage as a funding source, calculate the realistic amount:
- Estimate your property’s current value conservatively
- Apply the CLTV cap the lender offers on investment property
- Subtract your current first-mortgage balance
- Treat the result as your ceiling, and plan for the lender’s appraisal to possibly come in lower than your estimate
Knowing this number before you apply prevents the common disappointment of expecting a large line and receiving a smaller one because the CLTV cap left less room than assumed.
Calculate Your Available Equity
Our HELOC calculator applies the CLTV cap to your property’s value and current balance, showing what you can actually draw. For the broader choice between a line and a full refinance, see HELOC vs cash-out refinance.
When you know your number, apply now to see terms. Pre-qualification takes minutes with no hard credit pull.
All figures are illustrative and vary by lender and property. CLTV caps differ significantly between lenders and are typically lower for investment properties. Appraised value governs final calculations. Nothing here is a commitment to lend or financial, tax, or legal advice.
