Why this is harder than it sounds
A HELOC on an investment property is a second lien on a non-owner-occupied home — the single riskiest position in residential lending. If values fall and the borrower walks, the first mortgage gets paid from the foreclosure sale and the second lien often gets wiped out entirely. And history says borrowers protect the house they live in long before they protect a rental. Most big banks exited this product after 2008 and never came back.
So the lender panel is a fraction of the primary-residence HELOC market: mostly credit unions, some regional banks, and a handful of non-bank and fintech lenders. This is a product you hunt for, not one you stumble into at your local branch. Expect several "we don't do that" answers before you find a yes — that's normal, not a reflection on your file.
What terms look like when you find one
Everything is tightened relative to a primary-residence line:
- CLTV caps around 70-75%. Combined loan-to-value — your first mortgage plus the full line — typically can't exceed 70-75% of appraised value, versus 85-90% on many primary-home HELOCs.
- A rate premium. Rental HELOCs price at a margin over prime that's meaningfully wider than the same lender's primary-residence line. The occupancy risk shows up directly in the spread.
- Smaller maximum lines. Many lenders cap rental lines well below their primary-home maximums.
- Standard structure otherwise. A draw period (often 5-10 years) with interest-only payments on what you've drawn, then a repayment period. Variable rate unless the lender offers fixed-rate draw conversions.
Here's the math on a real file. Say your rental appraises at $400,000 and your first mortgage balance is $220,000. At a 70% CLTV cap, total allowed debt is $400,000 × 0.70 = $280,000. Subtract the $220,000 first lien and your maximum line is $60,000. The same property as a primary residence at 85% CLTV would support a $120,000 line — double. Size your expectations accordingly before you spend weeks shopping.
Credit, reserves, and documentation
Because the collateral position is weak, lenders lean harder on the borrower. Expect a credit floor around 680 with the real pricing tiers starting at 700-720+. Most lenders qualify you with full income documentation and a DTI that assumes the line is fully drawn — a $60,000 line gets underwritten at its maximum payment even if you plan to draw $15,000. Reserves of 6 or more months of the property's full payment are common, sometimes with additional reserves for other rentals you own. Bring the lease and be ready to document rental income; some lenders also cap how many financed properties you can have.
When a rental HELOC beats a cash-out refi
The entire case for the HELOC is preserving your first lien. If your existing mortgage carries a rate well below today's market, a cash-out refinance resets your whole balance at current investment cash-out pricing — the widest-priced transaction in residential lending — just to extract some equity. The HELOC leaves that first mortgage untouched, and you pay interest only on what you actually draw.
The rule of thumb: when the amount you need is small relative to your first-lien balance and that first lien is cheap, the HELOC usually wins even at a premium rate, because you're paying the higher rate on $60,000 instead of repricing $220,000. When you need a large lump sum, or your first lien is nothing special — or it's an ARM nearing reset — the refi usually wins. We break down the full decision framework in HELOC vs cash-out refi.
Alternatives when the banks say no
| Option | First lien untouched? | Typical leverage | Best for |
|---|---|---|---|
| HELOC on the rental | Yes | 70-75% CLTV | Smaller, flexible draws when your first-lien rate is worth protecting |
| Cash-out refinance | No — replaced | 70-75% LTV | Large lump sums; when the existing rate isn't worth keeping |
| HELOC on your primary residence | Yes (on the rental) | 80-90% CLTV on the primary | The biggest, cheapest line — but your own home is the collateral |
| Business-purpose credit line | Yes | Varies; asset- or portfolio-based | Active investors with an LLC and multiple properties |
| Cross-collateralized blanket loan | No | 65-75% aggregate | Pulling equity across several rentals in one loan |
Two notes on that table. The primary-residence HELOC is often the best pure economics for funding a rental project — higher CLTV, lower rate — but understand what you're doing: you're moving investment risk onto the roof over your head. And business-purpose lines and investor second mortgages live in the same non-QM world as DSCR loans; several DSCR lenders now offer closed-end second liens on rentals, which behave like a fixed-rate HELOC alternative when a true line isn't available.
How to actually shop it
Start with credit unions where you already have accounts — membership relationships genuinely move the needle on this product. Then ask every candidate the same five questions: What's your maximum CLTV on non-owner-occupied? What's the margin over prime for my credit tier? Do you qualify me at the fully-drawn payment? Do you limit the number of financed properties? What are the annual, inactivity, and early-closure fees? The answers vary wildly between lenders on this product — far more than on primary-home lines — which is exactly why a marketplace search beats calling banks one at a time.
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