The Quick Read: It depends on how much equity is left after your first mortgage: on an investment property, the line can reach 70% combined loan-to-value (CLTV, all loans on the property measured against its value), minus your existing balance, up to a $500,000 maximum line, subject to lender guidelines and a 700 minimum credit score.
- The formula: property value × 70%, minus every lien already on the property. Then the line must land between $25,000 and $500,000.
- Your first mortgage balance matters. Its low rate does not. A cheap loan with a big balance eats your room just like an expensive one.
- Title is a gate. The property must sit in your personal name or a revocable living trust. An LLC cannot hold title on this product.
- Credit above 700 buys eligibility, not leverage. Scores of 700 and 720 both reach the same 70% ceiling.
- Most of the line is drawn at closing, and the pricing floats. That changes how you should think about “available” credit.
Everything here is subject to lender guidelines and full file review. It is not a commitment to lend.
How large a line the equity supports.
An equity line is sized by combined loan-to-value, occupancy, and credit — not by rental coverage. Switch the occupancy or the credit band and the ceiling moves with it.
Investment-property lines require a 700 minimum credit score; second-home lines start at a 640 minimum and primary-residence lines at 600, and the combined-LTV ceiling steps down as the credit band drops on primary-residence and second-home lines and holds on investment-property lines; the line cap steps down on primary-residence lines and holds at every tier on investment-property and second-home lines.
A debt-to-income ratio above 45% requires 680+ credit. Profiles under 640 are limited to single-family homes. At least 75% of the approved line is drawn at closing. Ceilings, floors, and caps update from Lendmire’s centralized guideline source.
Line estimate
Illustrative estimate only — not a quote, Loan Estimate, approval, or commitment to lend. The rate is an editable assumption; equity-line pricing is variable through both the draw and repayment periods and never converts to fixed. Occupancy and credit drive the ceiling together: an investment property tops out at 70% combined LTV (minimum credit 700, line cap $500,000); a second home tops out at 90% combined LTV (minimum credit 640, line cap $500,000), with the ceiling stepping down as the credit band drops (the cap holds at every tier); a primary residence tops out at 90% combined LTV (minimum credit 600), and its $750,000 maximum line is available only at 75% combined LTV or below with a 700-or-better credit profile (720 on the longer-runway program) and a full appraisal. Lines above $500,000 require a full appraisal. Credit, debt-to-income, property type, and full underwriting review all affect the final line.
Why Lock-In Owners Ask This Question
If your first mortgage was set in a more favorable rate environment, refinancing to pull equity out feels like selling your best asset. That is the lock-in effect, and it is widespread. HousingWire’s coverage of First American’s lock-in report puts accessible home equity at a record $13.2 trillion, with about 88% of it tied to existing mortgages that sit below today’s market terms.
So the question becomes practical. Can you leave the first mortgage alone and borrow against the rental with a second lien? Scotsman Guide’s report on that research notes that a borrower who wants to keep a low-rate first mortgage may find a HELOC or home equity loan more attractive. Borrowers whose rates sit closer to the market may prefer a cash-out refinance.
Both halves of that matter. The line can work well. It also has a hard ceiling that surprises people who assume rentals borrow like a primary home.
How Is the Maximum Line Calculated?
The maximum line is the property’s value times the lender’s CLTV cap, minus every lien already on the property, then trimmed by the line’s dollar limits and your personal qualification. On this network’s investment-property product, the CLTV cap is 70% and the line runs from $25,000 to $500,000.
Work it in four steps:
1. Value the property. On an investment line, the value usually comes from an automated valuation. More on that below.
2. Apply the 70% cap. Multiply value by 0.70. That is the most total debt the property can carry.
3. Subtract all existing liens. Your first mortgage balance comes off first. Any other lien comes off too.
4. Apply the line limits. The result must be at least $25,000 and no more than $500,000. Your credit and debt-to-income ratio (DTI) must also clear. DTI tops out at 50%, and the lender reviews your file on the interest-only payment calculated on the maximum draw.
One point trips people up. The CLTV test generally counts the whole credit limit, drawn or not. An undrawn line is not free headroom.
NerdWallet’s explainer on HELOCs for investment property says investors face a smaller pool of lenders and cannot borrow as much as against a primary home, because lenders treat default risk as higher on rentals. That matches what you see across the market. Market surveys vary on the cap. Experian says lenders typically cap investment-property LTV at 80%, though that page is older. On this network, the investment-property ceiling is 70% CLTV. No tier sits above it.
Three Worked Examples (in Percent of Value)
These are modeled assumptions, not market data. They use percentages of value so you can map them onto your own property. Your own numbers come from your valuation and your payoff statement.
Low first mortgage.
- First mortgage balance: 20% of value.
- Room under the 70% cap: 50% of value.
- Result: on a higher-value rental, the $500,000 maximum line binds before the 70% test does.
Middle case.
- First mortgage balance: 50% of value.
- Room under the cap: 20% of value.
- Result: the line is that 20% slice, provided it clears the $25,000 minimum and your DTI.
Tight case.
- First mortgage balance: 67% of value.
- Room under the cap: 3% of value.
- Result: on all but high-value properties, that sliver falls under the $25,000 minimum. No line.
Notice what the examples share. Your first mortgage’s rate never enters the math. A recent buyer with a high-balance loan gets the least room. An owner with a long-amortized, low-balance loan gets the most.
Simple. Not always welcome.
What Moves the Limit and What Doesn’t
| Factor | Changes your limit? |
|---|---|
| First mortgage balance | Yes, dollar for dollar |
| First mortgage rate | No |
| Property value estimate | Yes |
| Credit score above 700 | No, eligibility only |
| Title (personal, trust, LLC) | Gate: LLC is out |
| Property type | Gate: some types are out |
| Number of financed properties | Gate: over 15 is ineligible |
That credit row deserves a second look. On an investment property, 700 is a hard floor with no tier beneath it. Scores of 700 and 720 land in the same 70% tier. A stronger score helps you qualify and protects you from a DTI problem. It does not buy a bigger line.
Where Lock-In Owners Hit a Wall
Title. The property must be held by you personally or by a revocable living trust. LLCs, corporations, partnerships, and irrevocable, blind, or land trusts cannot hold title. This is the sharpest difference from a DSCR loan. If your rental already sits in an LLC, you face a vesting change or a different product. A DSCR cash-out is the usual alternative, and DSCR loans to LLC-titled borrowers are available subject to lender program eligibility.
Property type. Single-family, two-to-four-unit, PUD, townhome, and condominium (including non-warrantable) are eligible. Manufactured homes, co-ops, condotels, log homes, commercial, mixed-use, and agricultural-zoned properties are not offered.
Exposure limits. A borrower is limited to three lines in total. An investor with more than 15 financed properties is not eligible. If you run a larger portfolio, this product may be closed to you before the math even starts.
Geography. The home equity line is available in a narrower set of states than the DSCR programs. Lendmire’s DSCR investor loans reach 41 markets, including Washington, D.C., but the HELOC footprint is smaller, so confirm availability first.
Valuation. Because an investment line caps at $500,000, and full appraisals begin only above $500,000, an investment HELOC sits in the automated-valuation lane. It commonly closes with no traditional appraisal. You can still ask for a full appraisal. Do that if you think the automated number undersells your property.
Floating Pricing, a 75% Draw, and the Payment Shift
The investment line uses a 5-year interest-only draw followed by a 25-year fully amortizing repayment. At least 75% of the line is drawn at closing. Pricing floats during both the draw and the repayment period, and it never converts to fixed.
Two consequences follow. First, you cannot open a large line and leave it parked as a cushion. Most of it becomes debt on day one. Second, your payment is lowest during the interest-only years and steps up when repayment begins.
The CFPB’s HELOC explainer describes the same shape: a draw period (it gives 10 years as an example) followed by a repayment period. Experian’s draw-period guide adds that some lines carry a balloon payment at the end of the draw. Check your own terms for that.
After closing, you can draw more in $1,000 minimums. The line is a tool for staged projects, not a savings account.
HELOC, DSCR Cash-Out, or a Line on Your Home?
Pick the HELOC when your first mortgage is worth keeping, you have room under 70% CLTV, and the property sits in your name. Pick a DSCR cash-out when you want an entity-held property or a qualification based on the rent. The table lays out the tradeoffs.
| Factor | Investment HELOC | DSCR cash-out | Line on your home |
|---|---|---|---|
| Collateral | The rental | The rental | Your residence |
| First mortgage | Stays in place | Replaced | Stays in place |
| Leverage | 70% CLTV | Up to 70% LTV | Higher tiers, credit-based |
| Reviewed on | Your credit and DTI | Property rent coverage | Your credit and DTI |
| LLC title | Not allowed | Per program eligibility | Not applicable |
A DSCR cash-out replaces your existing first mortgage. It qualifies primarily on property-level rental income covering the payment, subject to lender guidelines. Across most of the network, cash-out tops out around 70% LTV on standard rentals, and about 6 months of seasoning is the common expectation. Short-term-rental collateral caps lower than that standard figure. Most programs want a score near 660. A 620 floor exists in parts of the network, and 700+ unlocks the strongest leverage tiers.
On coverage, 1.00 is where many select programs start. A separate select-lender path takes coverage below 1.00, with leverage and terms adjusted. A stronger ratio opens better pricing and leverage. Clearing 1.00 is also not the same as positive cash flow. The calculation compares rent to the full payment (principal, interest, taxes, insurance) and nothing else. Repairs, vacancy, management, and utilities sit outside it.
The real price of a DSCR cash-out for a lock-in owner is the loss of the old first mortgage. If that loan is the reason you are reading this, run the blended picture before deciding. Compare your current first-mortgage payment plus the line’s interest-only draw payment against a single new loan. Do that comparison at each stage of the line, including after repayment begins.
Lendmire’s complete DSCR loans guide covers the full structure of those programs.
The primary-home route. You can also borrow against your own residence and use the cash toward a rental purchase. The rental is not the collateral in that case, so the investment-property ceiling does not apply. The line on your home carries its own rules and its own risk: your house secures the debt.
Thinking Out Loud: Is the Low Rate Worth the Cap?
This is a genuine toss-up for many owners. The HELOC keeps the cheap first mortgage but limits you to 70% CLTV, a $500,000 line, and floating pricing. A refinance gives you more leverage and a fixed structure, but it resets the loan you were protecting.
An investor with a small first-mortgage balance on a free-and-clear-ish rental may find the HELOC gives enough room. An investor whose first mortgage is already near two-thirds of value has almost nothing to borrow. For that second investor, the real choice is between a refinance and doing nothing.
Your Next-Steps Checklist
- Pull your first mortgage payoff balance and note any other liens.
- Confirm the title: personal name or revocable living trust.
- Confirm the property type is on the eligible list.
- Count your financed properties and existing lines.
- Check your credit score against the 700 floor.
- Work the formula: value × 70%, minus liens, against the $25,000 and $500,000 limits.
- Decide how much of the line you will carry, knowing most is drawn at closing.
- Compare against a DSCR cash-out using your rent and the blended-payment picture.
Key Terms Defined
CLTV (combined loan-to-value): The total of all loans on a property divided by its value.
Lien: A legal claim on the property that secures a loan. Your first mortgage is one.
Lock-in effect: The reluctance to give up a low-rate mortgage, which keeps owners from refinancing.
Draw period: The stretch when you can borrow from the line, usually with interest-only payments.
Automated valuation: A computer-generated property value used in place of a traditional appraisal.
Vesting: How title to the property is held, such as personal name, trust, or LLC.
DSCR (debt service coverage ratio): Monthly rent divided by the monthly principal, interest, taxes, and insurance.
Frequently Asked Questions
Does my low first-mortgage rate raise how much I can borrow?
No. The lender cares about the balance, not the rate. A low-rate loan helps your monthly cost, but the same balance leaves the same room under the 70% CLTV cap. The benefit of the lock-in is that the HELOC leaves that first mortgage untouched.
Can I use my primary home’s equity to buy a rental instead?
Yes. A line on your residence is a separate product with its own limits, and your home secures it. The rental you buy is not collateral, so the investment-property cap does not apply. You carry the added risk that missed payments put your own house on the line.
Will an investment HELOC require a full appraisal?
Usually not. Because an investment line caps at $500,000 and full appraisals begin only above that, these lines commonly run on an automated valuation. A higher CLTV may call for a secondary valuation, and you may request a full appraisal in any case.
Does the rent help me qualify?
Not on this product. An investment HELOC is reviewed against credit, DTI, and the equity in the property. A DSCR loan is the rent-based route, qualifying primarily on property-level rental income covering the payment, subject to lender guidelines.
Can an LLC borrow on this line?
No. Title must be held by you personally or by a revocable living trust. If the rental is already in an LLC, the practical options are a vesting change or a DSCR cash-out, subject to program terms.
Where to Go From Here
If you are considering a home equity line and want to see how the numbers work, Lendmire can help you compare HELOC options based on the property, the equity available, credit profile, combined leverage, and your goals. As a broker, Lendmire arranges these loans through select lenders in its wholesale network and does not lend directly.
About Lendmire
Lendmire, NMLS# 2371349, is a mortgage brokerage that arranges home equity lines of credit through wholesale lending partners in its 16 full-service states. Lines on primary residences, second homes and investment properties are each reviewed individually by the lender under the program’s occupancy, credit and combined-loan-to-value guidelines.
Scotsman Guide named Lendmire a Top Mortgage Workplace in 2026.
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Informational only. Not a Loan Estimate, approval, or commitment to lend. Program availability and eligibility are subject to lender guidelines, credit approval, property review, and underwriting.
References
1. HousingWire — accessible home equity and rate lock-in
2. Scotsman Guide — record home equity trapped by higher rates
3. NerdWallet — can you get a HELOC on an investment property
4. Experian — can you get a HELOC on investment property
6. Experian — what is a draw period on a HELOC
This article is part of Lendmire’s investment property HELOC program — full qualification details, guidelines, and scenarios live on the program page.
Related reading: How Much Can You Borrow With a DSCR Cash-Out Refinance After the Rehab on a BRRRR Rental? · 5 Portfolio DSCR Cash-Out Refinance Options to Borrow Against Property Owned by an LLC · Where to Get a DSCR HELOC on a Short-Term Vacation Rental
Brandon Miller
Founder & CEO, Mortgage Loan Originator, Lendmire LLC
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Required disclosures. Lendmire (NMLS# 2371349) operates as a licensed mortgage broker, not a direct lender or depository. The discussion in this article is general in nature and should not be relied upon as financial, legal, or tax advice — every investment scenario is unique and should be reviewed by a qualified professional. Any loan inquiry is subject to lender underwriting, and this article is not a commitment to lend or a guarantee of approval. Mortgage rates, loan terms, and program guidelines vary by borrower, property, and state, and may change without notice. Equal Housing Opportunity. Verify licensure at NMLS Consumer Access.