The Quick Read: Usually less than your equity suggests, because the line is sized as property value times a 70% combined-loan-to-value ceiling, minus your first mortgage balance, then held to a $500,000 cap and a rent test on the full credit limit, all subject to underwriting. Combined loan-to-value (CLTV) means the first mortgage plus the new line, divided by the property’s value.
- On a second lien behind your first mortgage, the ceiling is typically 70% CLTV at a 720 credit score or better, on lines of $50,000 to $500,000.
- Your first mortgage uses the room first. At 50% of value it leaves about 20% of value for the line. At 60% it leaves about 10%. At 70% or more it leaves none.
- Rent must cover a stress payment on the entire credit limit at 1.10x or better, not just the amount you draw.
- The percentage limit almost always binds before the $500,000 cap does.
The Formula: Value Times the Ceiling, Minus Your Liens
The maximum line on a rental you already have financed is the property value times 70%, minus the first mortgage balance. Then the program’s dollar limits and the rent test apply. Across Lendmire’s wholesale network, this is how a second-lien DSCR line is sized, subject to underwriting and lender guidelines.
The line is a standalone second lien. It sits behind the first mortgage you keep, and that mortgage stays untouched. The rent qualifies the file, and the owner’s personal income is never calculated. A DSCR loan is a business-purpose investor loan designed for non-owner-occupied rentals, so it is reviewed differently from a standard owner-occupied mortgage.
Here is how the first mortgage balance changes the room, using only percentages of value:
| First mortgage (% of value) | Room under 70% CLTV | What it means |
|---|---|---|
| 50% | About 20% of value | Meaningful line possible |
| 60% | About 10% of value | Thin room, often near the minimum line |
| 65% | About 5% of value | Usually too small for the $50,000 minimum |
| 70% or more | None | Second lien not available |
Run the table backward and it gets practical. Take a hypothetical first mortgage with a $500,000 balance. That balance alone reaches 70% of value only at a property value of roughly $714,000, and a line of at least $50,000 needs room beyond that point. The exact figure is a modeled threshold, and it moves with the valuation. In this example, the $500,000 is the balance you owe on the first mortgage, not a cap on the line.
A declining-market flag on the property can lower the ceiling by 5 points. That pushes every number in the table the wrong way.
Which Limit Binds First?
For most owners with a mortgage, the percentage ceiling binds first. The $500,000 cap only matters on a high-value property with a modest first mortgage. The rent test can also cap the line before either one does.
Think of three gates. You must pass all three, and the smallest result wins:
1. The percentage gate: value times 70%, minus the first mortgage balance.
2. The dollar gate: $50,000 minimum and $500,000 maximum on a second lien.
3. The rent gate: rent divided by the stress payment on the whole line must be 1.10x or better.
Many owners assume the $500,000 maximum means they can borrow $500,000. It does not. A rental with a large first mortgage can have almost no room under the percentage gate, no matter how much equity looks like it exists on paper.
The same arithmetic shows up in general consumer guidance. The CFPB’s HELOC booklet explains that many lenders take a percentage of appraised value and subtract the balance owed on the existing mortgage. Its example uses a $100,000 value, 75% and a $40,000 balance to reach a $35,000 line. That 75% is illustrative and written for a home, not a rental. Rental lines run on stricter ceilings.
How the Rent Test Caps the Line
The rent test measures rent against a payment on the whole credit limit, so a bigger line needs more rent. You cannot make the test easier by planning to draw less. Rent used for lender review has to be at least 1.10x the qualifying payment.
Gross monthly rent is divided by a stress payment. That payment is fully amortizing principal and interest on the entire line, at the start rate plus 2 percentage points. Taxes and insurance are not part of the qualifying payment. Whether the first mortgage payment joins the calculation on a second lien is something to confirm on the file, because the lender’s own coverage calculation governs.
Rent is the lesser of the appraisal’s market rent and the lease, unless three months of receipts support a lease above market. A lease in place is required. A two-to-four-unit property can have at most one vacant unit.
Picture an owner with plenty of room under the 70% ceiling but a rental whose rent barely clears 1.0x on the full line. The rent gate sets the line, not the equity. Sometimes the answer is a smaller line, and sometimes it is a different product.
Because the test uses the full limit, the line you request sets the payment you must cover. Asking for a smaller limit can bring the coverage up to 1.10x. The lender’s own calculation decides the result.
Step-by-Step: Sizing Your Own Line
Work through these five steps in order. Each one can lower the answer.
1. Get a realistic value. Lines up to $400,000 typically use an automated valuation with a property inspection report. A full interior appraisal is the other path, and lines above $400,000 require one. Appraisal waivers are not accepted. An automated valuation will not capture a recent rehab, so an owner who just renovated may want the full appraisal. NerdWallet notes that investment-property HELOCs may require more than one appraisal.
2. Add the liens. Add your first mortgage balance to the full line you want, then divide by value. The full limit counts, not the drawn amount.
3. Apply the ceiling. Multiply value by 70%, subtract the first mortgage, and compare the result to the $50,000 minimum and $500,000 maximum.
4. Test the rent. Divide gross monthly rent by the stress payment on the full limit. Aim for 1.10x or better.
5. Check the first mortgage’s paperwork. If the first mortgage is itself a DSCR loan, its documents must allow a junior lien. If the first lender blocks a second lien, start with a cash-out refinance instead.
What Changes the Answer
Credit score. A second lien needs a 720 credit score or better. Below 720 there is no second-lien option. Above 720 does not raise the ceiling either, since 70% CLTV is the top of the second-lien grid. Leverage, reserves, and pricing vary by lender and program; the final terms follow the full file review.
No mortgage on the rental. A first-lien line exists only on a rental with no mortgage. It reaches 75% loan-to-value at 740 or better and 70% from 700 to 739 on lines to $500,000. Lines above $500,000, up to $1,000,000, run at 65% at 720 or better. A borrower who keeps a first mortgage can only take the second lien.
Low appraisal. The ceiling is a percentage of value, so a lower value shrinks the room dollar for dollar. A low value also pushes the first mortgage’s share of value up.
LLC title. The LLC can stay on title, depending on program guidelines. Members sign as guarantors. By contrast, an investment HELOC qualified on personal income is a different program with its own rules, and it works from the owner’s income file.
Seasoning. A rental bought or refinanced inside the last 6 months is not eligible (that clock runs from the last note date to the new note date), and the owner must have held title for 6 months (settlement date to note date).
Minimum line size. When the room under the ceiling falls below $50,000, the line does not fit. At a 60% first mortgage, 10% of value only reaches the minimum on a property worth $500,000 or more.
Property type. Eligible properties include single-family, townhomes, planned unit developments, two-to-four units and condominiums. Rural-designated property, row homes, condotels, leaseholds, commercial, agricultural, mixed-use and modular or log homes are outside this program. So are a property listed for sale in the prior 2 months and one with a solar lien.
Exposure. The program allows at most 5 loans or $2,500,000 per borrower.
Credit history matters too. The program looks for no 30-day mortgage late in the last 12 months and 48 months since a bankruptcy, foreclosure, short sale or deed-in-lieu. No reserves and no cash to close are required, subject to underwriting.
How the Draw Terms Affect Real Affordability
This line is not a classic open-ended credit card on your rental. At least 80% of the line is drawn at closing, and the closing draw is never less than $50,000. On the smallest lines, that means the whole line is drawn at closing. Later draws are at least $5,000 each.
The draw period runs 5 years, interest-only on the drawn balance. Then a 25-year fully amortizing repayment period follows, with a 30-year maturity. The rate is variable.
So the payment you carry changes twice: when the variable rate moves, and when the interest-only years end. Plan for the end of the draw period when you decide how much to take. If the rent covers only the interest-only payment with little room, the repayment period will be tighter. That is a good reason to size the line to the rent instead of to the maximum.
Another note on use of funds. A line can fund the down payment on your next rental, but a separate loan buys the property. Keep enough cash flow to service the line until the new property is financed. Tax treatment varies; consult a qualified professional.
Line or Cash-Out Refinance?
Choose the line when you want to keep a first mortgage you like. Choose the cash-out refinance when you need one large sum, your score is under 720, or the first lender blocks a junior lien.
| Factor | DSCR HELOC (second lien) | DSCR cash-out refinance |
|---|---|---|
| First mortgage | Stays in place | Replaced |
| Ceiling | Up to 70% CLTV | Typically up to 75% LTV on standard rentals, 70% on short-term-rental collateral |
| Credit floor | 720 | Varies by program |
| Seasoning | 6 months, two clocks | About 6 months on most files |
| Funds | Line, 80% drawn at closing | Lump sum |
A cash-out refinance can fit better when the room under the line’s ceiling is under $50,000. A payoff can also trigger a prepayment penalty on the old loan, so check that first. For a deeper look at the structure, see Lendmire’s piece How Much Can You Borrow on an Investment Property HELOC Behind Your Existing Mortgage?.
The network figure for this DSCR HELOC second lien is 70% CLTV at 720 or better, subject to underwriting. NerdWallet also says not all lenders offer investment-property HELOCs and that requirements are strict. If you are weighing a larger first mortgage, Lendmire’s article How Much Can You Borrow on an Investment Property HELOC With a $500K Existing Mortgage? works through that case.
For the full picture of how these loans fit together, Lendmire’s complete DSCR loans guide covers the basics. This line is offered in 15 of Lendmire’s 16 licensed states, every licensed state except Tennessee, through select programs.
Key Terms Defined
Combined loan-to-value (CLTV): the first mortgage balance plus the new line, divided by the property’s value.
Second lien: a loan secured by the property that sits behind the first mortgage in repayment priority.
DSCR: the debt-service coverage ratio, meaning gross monthly rent divided by the qualifying payment. This program looks for 1.10x or better.
Stress payment: a fully amortizing payment on the whole credit limit at the start rate plus 2 percentage points, used only to test coverage.
Draw period: the first 5 years, when you pay interest only on the drawn balance.
Seasoning: the waiting period a lender wants after a purchase or refinance before a new loan.
Frequently Asked Questions
Can I get a DSCR HELOC if my rental already has a DSCR first mortgage?
Yes, if the first mortgage’s documents allow a junior lien. Check the loan paperwork before you apply. If the first lender blocks a second lien, a cash-out refinance is the usual alternative, subject to underwriting.
Is the $500,000 maximum what I can borrow?
No. The $500,000 is the top of the line range, not an amount you are entitled to. The 70% CLTV ceiling usually limits the line first, because your first mortgage uses up part of the room. Only a high-value property with a small first mortgage gets near the cap.
Does the rent test use the amount I draw or the full line?
The full line. Gross monthly rent is divided by the stress payment on the entire credit limit, and the result must be 1.10x or better. Drawing less does not make the test easier, but requesting a smaller limit does.
What if my credit score is 700 to 719 and I have a first mortgage?
The second lien needs 720, so that tier is out. A first-lien line only exists on a rental with no mortgage. A cash-out refinance on the rental is the more likely path, subject to underwriting and lender guidelines.
Can my LLC hold the rental?
Yes, depending on program guidelines. The LLC can stay on title, and the members sign as guarantors. A title holder who is not a borrower signs a non-borrowing owner acknowledgment and the security instrument.
Next Step
If you are considering a home equity line on a rental property and want to see how the numbers work, Lendmire can help you compare DSCR HELOC options based on the property, the rent, the equity available, credit profile, combined leverage, and your goals. Lendmire is a broker that arranges financing through select lenders in its wholesale network, and every file is underwritten individually. Program terms change, so confirm current guidelines before you plan around any figure here.
Most owners find their real limit by running the three gates, and the smallest answer is the one that counts.
About Lendmire
Lendmire — NMLS# 2371349 — is a mortgage broker that arranges DSCR home equity lines of credit on rental property in 15 of its 16 licensed states (every licensed state except Tennessee) through wholesale lenders. The line is qualified on the rental’s rent rather than the owner’s personal income, and every line is subject to the lender’s guidelines and full underwriting. Scotsman Guide named Lendmire a Top Mortgage Workplace in both 2025 and 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. CFPB – What you should know about HELOCs (booklet)
2. NerdWallet: Can You Get a HELOC on an Investment Property
This article is part of Lendmire’s DSCR HELOC program — full qualification details, guidelines, and scenarios live on the program page.
Related reading: Top DSCR HELOC Providers Without Refinancing Your Current Mortgage · Banks That Offer a DSCR HELOC When You Are Not on the Existing Mortgage · Can a DSCR HELOC Work on a Rental When a Relative Pays No Rent?
Brandon Miller
Founder & CEO, Mortgage Loan Originator, Lendmire LLC
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Disclosure information. Lendmire is a state-licensed mortgage brokerage under NMLS# 2371349. Lendmire is not a depository institution, direct lender, or financial advisor — all loans referenced are placed through wholesale lender partners and are subject to each lender's underwriting standards. This article is provided for general informational purposes and is not a commitment to lend, nor does it constitute financial, legal, or tax advice. Loan programs, terms, rates, and qualification standards change without notice and depend on borrower profile, property type, and the state in which the subject property is located. Equal Housing Opportunity provider. NMLS Consumer Access: nmlsconsumeraccess.org.