How Much a HELOC Saves on Card Debt When You Keep Your First

The Quick Read: A HELOC saves on card debt by replacing a high-cost unsecured balance with a lower-cost line secured by your home, while your first mortgage keeps its existing terms, and the real savings equal the rate gap times the balance moved, minus closing costs, adjusted for how much principal you actually repay.

• The savings are a scenario, not a promise, because the line floats and the card balance may not sit untouched.
• A second-lien line leaves your first mortgage’s rate, term, and payment alone. Only the new money is priced at today’s terms.
• On this network, an investment-property line tops out at 70% CLTV and $500,000. Primary-residence lines can run larger, up to $750,000, with tighter CLTV above $500,000.
• The cards have to stay at zero afterward, or the strategy adds debt instead of removing it.

What a HELOC Is, and Why Keeping the First Matters

A HELOC is a revolving line secured by your property. You draw, repay, and draw again within the limits. The lender’s collateral is the home, so the line is generally priced well below an unsecured card.

That is also the risk. Bankrate points out that rolling card debt into home-secured debt trades unsecured debt for secured debt. A missed card payment hurts your credit. A missed HELOC payment can put the property at risk.

Keeping your first mortgage matters for a simple reason. If you took a cash-out refinance instead, the new rate would apply to the whole balance, including the part you already owe at a lower cost. A second-lien HELOC prices only the new money. For an investor sitting on a below-market first mortgage, that difference can be larger than the card savings themselves.

Specify a second-lien line when you shop. A first-lien HELOC replaces the existing mortgage, as Benzinga notes, which defeats the purpose here. On Lendmire’s network, a line can sit in first or second position, so the lien position is a choice you make at application.

How the Savings Work, Step by Step

There is no single savings number. Three things decide it: the gap between the card rate and the HELOC rate, how much principal you repay, and what the line costs to open.

1. Find the gap. Card rates are typically tied to prime plus a fixed margin. A HELOC is also priced off an index plus a margin. Experian explains that the index is usually the prime rate and the margin stays fixed for the life of the line. Prime is the same for every lender, so the margin is where you can shop.

2. Size the balance moved. Only the amount you actually shift from cards to the line earns the lower price. The line must fit inside your combined loan-to-value room. Experian notes that thin equity may mean you cannot borrow enough to clear every card.

3. Run the formula. Savings equal the card rate minus the HELOC rate, times the balance moved, minus closing costs and any annual fees, adjusted for how long the balance would otherwise have sat on the cards.

4. Check the draw period. During the draw, payments are often interest-only. If you pay only interest, the principal never falls, and the debt has just moved. A payoff plan with a firm end date is what turns a lower rate into real savings.

5. Stress the number. The index moves, so the HELOC cost can drift up. Cards move with prime too, so they stay a poor benchmark either way. Still, run your math at a higher line cost and see where the break-even sits.

Here is a way to think about it without picking numbers. A large balance that would sit on cards for years gains the most from the swap. A small balance you could clear in a few months may not cover the closing costs. The savings disappear when the balance is small, the payoff horizon is short, or the fees are heavy.

The Federal Reserve’s G.19 release is the primary source for average card APRs. Trackers measure different things: all accounts, only accounts that accrue interest, or new offers. Use your own statements for the card side of the formula, not a headline average.

Keep-the-First Comparison

Here is how the common options treat your first mortgage.

BiggerPockets frames the core split this way: a HELOC is a second mortgage, so you carry two payments, while a cash-out refinance is a new first mortgage that replaces the old one with a lump sum.

The keep-the-first logic weakens in three cases. One is when your existing first-mortgage cost is close to current market pricing. Another is when the cash need is large. The third is when equity is thin and the line can’t cover the debt. In those cases, a refinance may win. This is a toss-up for many investors, and the answer comes from running both.

What the Network Allows

Lendmire is a mortgage broker. It arranges home equity lines through select wholesale partners and does not lend. Every figure below is subject to lender guidelines and a full file review. Availability is limited to Lendmire’s 16 full-service states, which is narrower than its 41-market DSCR footprint.

The ceiling depends on the property you borrow against:

• Primary residence: up to 90% CLTV, and only at a 720-or-better credit profile, on lines up to $500,000. A 700 profile reaches 85% CLTV up to $500,000. Lower tiers step down from there. Lines above $500,000, up to a $750,000 maximum, are available on primary residences only, cap at 75% CLTV, need a 700 credit profile or better (720 on the longer-runway structure, the 5-year draw and 25-year repayment option described below), and require a full appraisal.
• Second home: up to 90% CLTV at 720 or better, up to $500,000.
• Investment property: 70% CLTV, with a 700 credit minimum, up to $500,000. There is no tier above that.

Most lines are standalone and can sit in first or second position. Two draw structures exist on primary residences and second homes: a 3-year interest-only draw with a 17-year repayment, and the longer-runway 5-year draw with a 25-year repayment. Investment lines use the 5-year draw structure only. At least 75% of the line is drawn at closing, which suits a card payoff, since you are using most of the line immediately. Pricing floats through both phases and never converts to fixed.

Two qualification points matter for card debt. Debt-to-income caps at 50%, and the payment is figured on the interest-only amount at the maximum draw. Because card minimums count against you, paying them off can help the file. Lines at or below $500,000 usually run on an automated valuation instead of a full appraisal.

Title is the sharpest difference from a DSCR loan. The borrower must hold title individually or in a revocable living trust. An LLC cannot hold title on a home equity line. A property already deeded to an LLC needs a vesting change, or a DSCR cash-out instead.

DSCR Cash-Out as the Alternative

DSCR loans are designed for non-owner-occupied investment properties. Because they are business-purpose investor loans, they are reviewed differently from a standard owner-occupied mortgage.

A DSCR loan is reviewed primarily on property-level rental income covering the payment, subject to lender guidelines. Personal card balances do not drive that review the way they drive a HELOC’s debt-to-income test. On a standard rental, DSCR cash-out generally tops out around 75% LTV, with about six months of seasoning common. Coverage of 1.00 is where select programs start, and stronger ratios open better pricing and leverage. A separate select-lender path takes coverage below 1.00, with leverage and terms adjusted.

Understand what the ratio does and does not tell you. It compares rent to the full monthly obligation (principal, interest, taxes, insurance). Clearing 1.00 is not the same as positive cash flow. Repairs, vacancy, management, and utilities sit outside the calculation. Lendmire’s complete DSCR loans guide covers the mechanics in depth.

The tradeoff is cost and structure. A cash-out replaces your existing loan on that rental, so it only fits when you are comfortable repricing it. If the rental carries a low-cost first loan, a separate line against another property may keep more value.

Where the Savings Break Down

The general rule fails in several named situations.

• The cards refill. Experian warns that zeroing the cards and gaining a new credit line can tempt more spending. If balances return, you now owe both. Close cards or set a payoff date and automate it.
• Interest-only drift. Interest-only draw payments feel light. When the line converts to amortizing payments, the payment steps up. Plan for that shift before you sign.
• Variable cost. A rising index raises the line’s cost. Your budget has to hold at a higher figure.
• Credit-score effects differ. Experian says FICO scores are designed to leave HELOCs out of utilization, while VantageScore may count them. Paying cards down usually lowers utilization either way. A hard inquiry can cause a small, temporary dip.
• The interest is generally not a deduction. Tax treatment can depend on how the funds are used and how the property is held; investors should keep clear records and speak with a qualified tax professional before relying on any deduction.
• Equity opportunity cost. Equity used for cards is not available as down-payment capital. Ask what that equity is worth deployed into the next acquisition.
• Costs the rate omits. The CFPB’s HELOC booklet describes the product plainly: a line you borrow against, repay, and borrow again, secured by your home. Its APR reflects the interest rate alone, so closing costs and fees must be compared separately.

Practitioner view: across the wholesale network, the files that work best in this situation share a pattern. The investor holds a low-cost first mortgage, carries a card balance that would otherwise sit for years, and has a written payoff plan. The files that struggle usually have thin equity, or they treat the line as permanent working capital.

What the Investor Decision Looks Like

Picture an investor with a below-market first mortgage on a primary residence and a card balance built up from rehab costs. Equity is solid, credit is above 720, and the balance fits well inside the CLTV limit. A second-lien line is the natural fit. The first loan stays untouched and only the card balance is repriced.

Now change the facts. The card balance is small, or the investor plans to clear it in a few months. The closing costs may exceed the savings, and a balance-transfer offer may do the job.

Change them again. The rental sits in an LLC. The home equity line is off the table unless the title changes. A DSCR cash-out on that rental becomes the practical route, and rental coverage, not personal income, drives the review.

Before applying, run this checklist:

1. Confirm your first mortgage stays in place and the new line is second lien.

2. Estimate the savings with the formula and subtract all fees.

3. Stress the result at a higher line cost.

4. Set a payoff date and automate payments.

5. Decide what happens to the cards: close them or freeze them.

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. For a related look at the same strategy, Lendmire’s piece How Much a Self-Employed Owner Saves Consolidating Debt Into a HELOC walks through the self-employed version. Reach the team at 828-256-2183, or use the illustrative calculator on this page for a rough estimate.

Key Terms Defined

CLTV: Combined loan-to-value, which adds all liens on the property and divides by its value.

Draw period: The early phase of a line, when you can borrow and often pay interest only.

Index and margin: The index is a market benchmark such as prime, and the margin is the lender’s fixed add-on.

Second lien: A loan that sits behind your first mortgage and leaves it unchanged.

DSCR: A ratio that compares a property’s rent to its full monthly housing obligation.

About Lendmire

As a mortgage broker (NMLS# 2371349), Lendmire helps homeowners and real estate investors in its 16 full-service states open home equity lines of credit arranged through wholesale lenders. Lendmire is never the lender; line amounts, ceilings and terms are set by the lender under its guidelines. Scotsman Guide named Lendmire a Top Mortgage Workplace in both 2025 and 2026.

References

1. Bankrate: using home equity to consolidate debt

2. Benzinga

3. Experian: how HELOC APRs work

4. Experian: using a HELOC to pay off credit card debt

5. Federal Reserve G.19 release

6. BiggerPockets

7. Experian

8. CFPB HELOC booklet