The Quick Read: It depends on three numbers, and the adjustable rate on your first mortgage is not one of them: a second-lien DSCR HELOC is sized by property value times a 70% combined loan-to-value ceiling, minus your first mortgage balance, then limited to lines between $50,000 and $500,000, subject to underwriting. A DSCR HELOC is a home equity line on a rental, qualified on the rent instead of your personal income. Whether your first loan is fixed or adjustable changes the risk around the line, not the sizing formula.
- The ceiling is 70% combined loan-to-value (CLTV) on a second lien behind your first mortgage, on a non-owner-occupied rental, at a 720 credit score or better.
- Lines run from $50,000 to $500,000 on a second lien, and at least 80% of the line is drawn at closing.
- The rent must cover a stress payment on the entire credit limit at 1.10x or better, not just the drawn balance.
- An adjustable first matters through its balance, its reset schedule, and what its loan documents say about a second lien. Exact terms depend on the lender’s guidelines, property type, leverage, and a full review of the borrower’s file.
All figures are typical guideline ranges from select programs, not offers. Each file is underwritten individually. This is not a commitment to lend.
The Formula in One Line
The line equals property value times the maximum CLTV, minus every loan already secured by the property. CLTV means combined loan-to-value: all liens added together and divided by the property’s value. Motley Fool’s explainer on loan-to-value describes the same arithmetic for a home-equity line, and Yahoo Finance notes the calculation adds up all loans against the property.
Those outside pages describe owner-occupied home lines, where lenders often allow a CLTV of 80% to 85%. A rental line is a different product. Across the wholesale network Lendmire works with, the second-lien ceiling on a non-owner-occupied rental is 70% CLTV at a 720 score or better, on lines up to $500,000, subject to underwriting.
Here is the math with hypothetical, modeled inputs. Say the property is worth 100 units and the first mortgage balance is 50 units. The room is 70 minus 50, which is 20 units. You can think of units as percentages of value.
| First mortgage (% of value) | Room under 70% CLTV | What it means |
|---|---|---|
| 40% | 30% of value | A sizable line, capped at $500,000 |
| 55% | 15% of value | Works only if 15% of value reaches the $50,000 minimum line |
| 70% | 0% | No second lien is possible |
Equity and borrowing power are not the same thing. A property can have a lot of equity and still support a small line, because the ceiling counts every lien, not just your first.
Does an Adjustable First Mortgage Change the Number?
No, not directly. The formula uses the balance on your first mortgage, not its rate type. Two borrowers with the same value and the same first-mortgage balance get the same room under the ceiling, whether one loan is fixed and the other adjustable.
The adjustable first matters in four indirect ways:
1. Balance drift. Most adjustable loans amortize normally, so the balance shrinks over time. Some products carry interest-only or payment-option features that can let the balance hold steady or grow. A higher balance means less room.
2. Payment pressure. A reset can raise your first-mortgage payment. That squeezes cash flow even though the line’s sizing is unchanged.
3. Coverage math. Whether the first-mortgage payment joins the qualifying payment on a second lien is something to confirm on the file, because the lender’s own coverage calculation governs.
4. Loan documents. Your first mortgage note and deed of trust must allow a junior lien. That is a document check, not a formula.
How to Size Your Line, Step by Step
Run the numbers in this order before you apply.
1. Get a realistic value. Everything hangs on the valuation. On lines up to $400,000, the program uses an automated valuation (confidence score of 85 or better) with a property inspection report, or a full interior appraisal. Lines above $400,000 take a full interior appraisal on Form 1004, 1073 or 1025. Appraisal waivers are not accepted.
2. Add every lien. Use today’s first-mortgage balance, plus any older second lien or open line that is still recorded. An unreleased line counts against you even at a zero balance.
3. Apply 70% CLTV. Multiply value by 70% and subtract the liens from step two. That is your ceiling.
4. Check the line-size limits. Second-lien lines start at $50,000 and top out at $500,000. If your room falls below the minimum, a second lien does not fit.
5. Test the rent. The rent must cover the stress payment on the full line at 1.10x or better (more on this below).
6. Check the file items. Credit score, mortgage history, seasoning, borrower status and property type all have to fit.
If you want the detailed requirements list for this exact setup, Lendmire’s page on investment property HELOC requirements behind an adjustable first mortgage goes line by line.
What Else Limits the Line
The 70% ceiling is only the first gate. Several other limits can shrink or block a line, and most of them are the same whether your first loan is fixed or adjustable.
| Item | Second lien behind your first mortgage |
|---|---|
| Maximum leverage | 70% CLTV at 720 or better |
| Line size | $50,000 to $500,000 |
| Closing draw | At least 80% of the line; later draws $5,000 or more |
| Credit | 720 minimum; no 30-day mortgage late in the last 12 months |
| Seasoning | 6 months since the last note date and 6 months on title |
| Reserves | None required |
| Exposure | At most 5 loans or $2,500,000 per borrower with the program |
Credit history deserves a second look if your first mortgage is adjustable. The 12-month mortgage-history check covers your first loan too, so a late payment after a reset would count. Waiting periods are 48 months after a bankruptcy, foreclosure, short sale or deed-in-lieu.
Two rules on timing. 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). If you recently refinanced into your adjustable first, check the note date before you plan anything.
The program is open to U.S. citizens, permanent residents, and non-permanent residents with a Social Security number. Foreign nationals and ITIN borrowers are not eligible.
Property type also matters. Single-family homes, PUDs, townhomes, two-to-four-unit properties, condominiums and lots up to 10 acres can fit. Rural-designated property, row homes, condotels, leaseholds, land trusts, mixed-use, modular and log homes, and a property listed for sale in the prior 2 months are outside this lane. A declining-market flag on the property lowers the ceiling by 5 points, so a market-wide dip can shrink your room before you apply.
How the Rent Test Treats Your Line
The coverage test uses the whole credit limit, not just what you draw. DSCR is gross monthly rent divided by the qualifying payment. That payment is a fully amortizing payment on the entire line at the start rate plus 2 percentage points, so it is a stress payment. Taxes and insurance are not part of it.
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 1 vacant unit.
Picture an investor who asks for the largest line the formula allows. The stress payment is sized on that full amount, so asking for the maximum is the hardest version of the test. A smaller line produces a smaller qualifying payment and a higher coverage number. If the rent falls just short of 1.10x, trimming the requested line is often the cleanest fix, subject to the $50,000 minimum.
Confirm on the file how the lender treats your first-mortgage payment in that calculation. The qualifying arithmetic is illustrative, and the lender’s own calculation governs. For the broader method behind coverage ratios, the complete DSCR loans guide covers how the ratio works across DSCR products.
No traditional personal-income documentation, W-2s or personal income calculation are part of this. The line qualifies primarily on property-level rental income covering the payment, subject to lender guidelines. The lease, the credit report and the valuation are all still documented.
Two Floating Rates and Two Clocks
Your adjustable first and your DSCR HELOC both move, and they run on separate clocks.
On the HELOC side, the line has a variable rate. The CFPB’s HELOC booklet explains that HELOCs typically carry variable rates tied to a public benchmark, that federal law requires a lifetime ceiling on a variable-rate plan secured by a dwelling, and that payments can change even if you do not borrow more. Rate and pricing terms come with the lender’s disclosures.
On the first-mortgage side, the Ask CFPB page on adjustable-rate mortgages explains that the formula your lender uses to reset your rate is set in the loan agreement and does not change after closing. Only the benchmark it tracks moves, and the new rate is still subject to the ceilings in your note.
The program’s own clock is simple. The draw period is 5 years of interest-only payments on the drawn balance. Then a 25-year fully amortizing repayment period begins, with a 30-year maturity. The payment steps up when repayment starts, because principal joins the bill.
Map both timelines on one page. Mark your first mortgage’s next reset date and the date repayment would begin on the line. Then ask three questions:
- Flat benchmark: Does the rent still cover both payments with a comfortable cushion?
- Moderate rise: Does cash flow stay positive if both floating rates move up together?
- Both at their ceilings: Can you carry both loans if each hits the highest level its documents allow?
The third test is the one that matters. Run it with the ceilings written in your first mortgage note, not a number you invented. If the property only works when nothing moves, the structure is thinner than the 1.10x test suggests.
Check Your First Mortgage First
Before you size anything, pull your first mortgage documents and confirm these items.
- Lien language. Look in the deed of trust for any clause that restricts a junior lien. Ask the servicer if the answer is unclear.
- Reset date and schedule. Know when the next adjustment lands and how often it repeats.
- Ceilings in the note. Find the per-adjustment limit and the lifetime limit.
- Balance behavior. Confirm the loan fully amortizes and has no balance-growth features.
- Prepayment terms. These matter if you may refinance the first later.
- Other liens. Order a title or lien search to catch old seconds or open lines.
The borrowers on the line do not have to be the borrowers on the first mortgage. The owner’s LLC can stay on title for an investment property, with the members signing as guarantors, subject to program terms. A title holder who is not a borrower signs a non-borrowing owner acknowledgment and the security instrument.
When There Is No Room
If your first mortgage already sits at or near 70% of value, a second lien has little or no room. You have a few honest options.
- Wait. Principal paydown and rising value both open room over time, though neither is predictable.
- Pay down the first. A lump-sum paydown can create room, though it uses the cash you were hoping to unlock.
- Switch structures. A DSCR cash-out refinance replaces the first mortgage instead of sitting behind it. That ends your exposure to the adjustable rate, but it also gives up the first loan you chose to keep.
The two paths compare like this.
| Factor | DSCR HELOC (second lien) | DSCR cash-out refinance |
|---|---|---|
| Your first mortgage | Stays in place | Paid off and replaced |
| Structure | Revolving line, 5-year interest-only draw period | New closed-end loan |
| Adjustable-first exposure | Remains | Ends |
| Leverage measure | CLTV, up to 70% | Loan-to-value on the new loan; varies by program |
The comparison turns on your existing loan. If its terms are strong and the reset is far away, a line behind it can make sense. If the reset is close and the balance is high, replacing the loan may fit better.
Common Mistakes That Shrink the Line
Honestly, most surprises come from these.
- Treating equity as the line. The line is the ceiling minus all liens, not your total equity.
- Borrowing a home-line benchmark. The 80% to 85% figures quoted for owner-occupied home lines do not apply to a rental. This program is never offered on an owner-occupied home.
- Assuming the adjustable first disqualifies you. It does not, on its own. The lender looks at the balance, the payment history, and the loan documents.
- Using a stale value. CLTV is only as good as the valuation. An automated valuation may not reflect a recent renovation, which is one reason larger lines take a full appraisal.
- Forgetting old liens. A forgotten second or open line eats room.
- Testing the drawn balance. The rent test runs on the full limit.
- Assuming a higher credit score raises the ceiling. On a second lien, the score unlocks the tier. The tier starts at 720, and the ceiling is 70% CLTV.
Key Terms Defined
DSCR (debt service coverage ratio): Gross monthly rent divided by the qualifying payment; this program requires 1.10x or better.
CLTV (combined loan-to-value): Your first mortgage balance plus the new line, divided by the property’s value.
Second lien: A loan recorded behind your first mortgage, paid second if the property is ever sold or foreclosed.
Draw period: The first 5 years of this program, when payments cover interest only on the drawn balance.
Reset: The date an adjustable first mortgage recalculates its rate under the formula in its loan agreement.
Stress payment: The qualifying payment the lender tests rent against, calculated on the full line at the start rate plus 2 percentage points.
Frequently Asked Questions
Does an adjustable first mortgage reduce how much I can borrow?
Not by itself. The line is sized from value, the 70% CLTV ceiling and your first-mortgage balance, so the rate type does not enter the formula. A higher balance does reduce room, and an adjustable loan with a balance-growth feature could do that over time. The first loan’s documents must also allow a second lien.
Can I draw only part of the line at closing?
At least 80% of the line must be 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 $5,000 or more each. Size the request to what you plan to use.
Does the first mortgage payment count in the rent test?
The program tests rent against a stress payment on the entire line, and the lender’s own calculation governs the treatment of the first-mortgage payment. Confirm on the file how the lender handles it. Taxes and insurance are not part of the qualifying payment.
Can my LLC hold the property?
Yes, an LLC can be on title for an investment property, subject to lender program eligibility. The members sign as guarantors, and a title holder who is not a borrower signs a non-borrowing owner acknowledgment and the security instrument. Owner-occupied homes and second homes are not eligible.
Where is this program offered?
The DSCR HELOC is offered in 15 of Lendmire’s 16 licensed states, every licensed state except Tennessee. These are Alabama, California, Colorado, Florida, Georgia, Indiana, Michigan, Montana, New Mexico, North Carolina, Ohio, Pennsylvania, Texas, Virginia and Washington. Lendmire is a broker that places the line through a wholesale lender in its network.
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. Call 828-256-2183 or request a quote through Lendmire’s quote page. Qualification is subject to lender guidelines, credit approval and property review.
The adjustable rate on your first loan decides how much risk you carry, not how much room you have, so start with the balance and the reset date.
About Lendmire
Lendmire (NMLS# 2371349) is a mortgage brokerage serving landlords and real estate investors in 16 licensed states. DSCR home equity lines of credit on non-owner-occupied one-to-four-unit rentals are arranged through wholesale lending channels in 15 of those states (every licensed state except Tennessee); Lendmire brokers the line and the lender underwrites each application on the property’s rent, credit and leverage. 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. Motley Fool – Loan-to-value
2. Yahoo Finance – Combined loan-to-value ratio
3. CFPB – What you should know about home equity lines of credit
4. Ask CFPB – Adjustable-rate mortgages: how the formula for your rate works
This article is part of Lendmire’s DSCR HELOC program — full qualification details, guidelines, and scenarios live on the program page.
Related reading: How Much Can You Borrow on a DSCR HELOC for a Mortgaged Rental With a Fixed First? · How Much Can You Borrow on a DSCR HELOC as a Co-Owner Who Is on the Deed? · How Much Can You Borrow on a DSCR HELOC After a First Mortgage Modification?
Brandon Miller
Founder & CEO, Mortgage Loan Originator, Lendmire LLC
- Mortgage Loan Originator · NMLS# 1129696 · Verify on NMLS Consumer Access
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- Lendmire LLC · Firm NMLS# 2371349 · Verify firm licensure
Compliance and disclosures. Lendmire (NMLS# 2371349) is a licensed mortgage broker and is not a direct lender, depository institution, financial advisor, or tax professional. Content in this article is general market analysis and educational information — not financial, legal, or tax advice for any specific situation. Lendmire does not guarantee loan approval; every transaction is subject to underwriting by the funding lender. Mortgage pricing and loan program guidelines are subject to change at any time without notice and vary by borrower characteristics, property type, and state regulations. Lendmire complies with Equal Housing Opportunity. Licensure verification: NMLS Consumer Access.