If you locked in a 2.75%–4% mortgage rate, you own something you can never buy again. But what happens when life says it’s time to move — more space, less space, a different neighborhood — and selling means trading your rate for one nearly twice as high?
There’s a third option most homeowners never hear about: keep the house, keep the rate, and use the equity you’ve built to buy your next home. This guide explains exactly how it works, who it fits, who it doesn’t, and the honest math to decide for yourself.
1. What a HELOC Actually Is — In Plain English
A HELOC (Home Equity Line of Credit) is a credit line secured by your home — think of it as a large, low-rate credit card backed by the equity you’ve built. Three things make it different from a regular loan:
- You only borrow what you use. Approved for $250,000 but only need $150,000? You pay interest on $150,000 — the rest just sits there available.
- You only pay on what you’ve drawn. During the first phase (the “draw period,” typically 10 years), most lenders require interest-only payments.
- Your first mortgage doesn’t change. Your existing loan — and its rate — stays exactly as it is. The HELOC sits behind it as a second position.
After the draw period ends, the line converts to a repayment period (typically 10–20 years) where you pay principal and interest on the balance.
2. The Strategy: Keep the House, Buy the Next One
- Open a HELOC on your current home, using the equity you’ve built.
- Draw from the line for the down payment on your next home.
- Move into the new home. Rent out the old one.
- The rent covers the old mortgage plus the HELOC payment — this is the math that decides everything (Section 5).
The result: you kept your low-rate loan, you now own two appreciating properties, you have a tenant paying down your mortgage — and in California, your original home keeps its existing Prop 13 property-tax basis, which often makes the rental numbers meaningfully better than a new buyer of the same house would see.
3. Who This Works For — and Who It Doesn’t
This strategy fits you if:
- Your current mortgage rate is well below today’s rates (roughly 5% or lower)
- You have substantial equity — typically you can borrow up to a combined 80–90% of the home’s value across both loans
- Your income can qualify carrying the old mortgage, the HELOC payment, and the new mortgage (lenders typically credit about 75% of market rent from the old home to help you qualify)
- Your old home would rent for enough to cover, or nearly cover, its total monthly cost
- You’re open to being a landlord — or hiring a property manager (~8–10% of rent)
Think twice if:
- Your debt-to-income ratio is already tight — this strategy stacks three payments on you until the rental income is established
- Your equity is thin — borrowing near the maximum leaves no cushion if values dip
- You need the equity soon for retirement or other plans — this ties it up
- The rent your home would command falls well short of its monthly carrying cost — then you’re paying every month to keep it
4. Today’s Rates — and What “Good” Looks Like
As of July 2026, the national average HELOC rate is roughly 7.25%–7.45%, with actual offers ranging from about 6% for the strongest borrowers to over 8% depending on credit score, combined loan-to-value, and lender. HELOC rates are variable — tied to the prime rate — so your rate moves when the Fed moves. A fixed-rate cousin, the home equity loan (lump sum, currently averaging about 7.4%), trades flexibility for payment certainty; ask your lender to quote both.
- A good HELOC offer right now: at or below ~7.25%, low or no closing costs, no annual fee (or a small one), and no prepayment penalty.
- What moves your rate: credit score (740+ gets the best tiers; 800+ the very best), how much of your equity you borrow (lower is better), and shopping multiple lenders — quotes genuinely vary by a full percentage point or more.
5. The Math: How to Decide If This Is a Good Deal for YOU
Four steps. Grab your numbers and a calculator — this takes ten minutes.
Step 1 — How much can you borrow?
(Your home’s value × 0.85) − current mortgage balance = your approximate maximum HELOC
Example: $750,000 home × 0.85 = $637,500, minus a $350,000 balance = up to ~$287,000 available. (Some lenders use 80%, some 90%.)
Step 2 — What will the HELOC payment be?
Amount drawn × interest rate ÷ 12 = monthly interest-only payment
Example: $150,000 drawn × 7.25% ÷ 12 = about $906/month during the draw period.
Remember: interest-only means the balance isn’t shrinking. Plan to pay it down — or plan for the higher principal-and-interest payment when the draw period ends.
Step 3 — Does the rent cover the old house?
Market rent vs. (old mortgage payment + taxes + insurance + HELOC payment + ~5–10% for maintenance/vacancy)
Example: rent $3,400 vs. $2,100 PITI + $906 HELOC + $250 reserve = $3,256. Rent covers 104% — the house pays for itself.
Step 4 — Read your result:
- Rent covers 100%+ of total cost: strong deal — you’re moving for free while a tenant pays your mortgages down.
- Rent covers 90–100%: workable — a small monthly contribution buys you the low rate, the appreciation, and the tax basis. Many investors happily pay this.
- Rent covers less than ~90%: be honest with yourself — you’re paying real money monthly to keep the house. Sometimes still worth it; often a sign that selling (or a smaller draw) is the better path.
We will run this exact math for your specific home at no charge — including the true market rent (from real local comps, not a website guess) and what your home would actually appraise for. That’s the appraiser side of our team doing what it does.
6. Honest Cautions — Read These Before You Fall in Love
- The rate is variable. Budget the payment at 1–2% higher than quoted. If that breaks the math, the deal is too tight.
- You must qualify carrying everything. Old payment + HELOC + new mortgage. Rental income helps (lenders credit ~75% of market rent), but your income does the heavy lifting.
- Interest-only is a tool, not a lifestyle. The principal is still there. Have a paydown plan.
- Being a landlord is a job. Tenants, repairs, vacancies. A property manager (~8–10% of rent) solves most of it — include that cost in Step 3 if you’d use one.
- Taxes are their own conversation. Interest on a HELOC used to buy a different property is generally NOT deductible like regular mortgage interest, though rental-property rules may apply once the home is a rental. One meeting with your CPA before you draw a dollar — worth it.
- Alternatives exist, and here’s the honest take: a cash-out refinance would replace your low-rate loan entirely (defeats the purpose); bridge loans run 9–12% and are built for people planning to sell; a fixed home-equity loan is the right cousin if variable rates keep you up at night. For keeping your rate and buying the next home, the HELOC is the standard tool for good reason.
7. How to Get Started — The Exact Sequence
- Run the math first (Section 5) — or let us run it with real comps and a true rent number. Ten minutes tells you whether to proceed.
- Check your credit. 740+ unlocks the good tiers. Pay down credit cards before applying if you can.
- Open the HELOC BEFORE you house-hunt. This is the step people get backwards. Approval takes 2–6 weeks, and you want the line open and ready so you can write offers like a cash-strong buyer. An open, undrawn HELOC costs little or nothing to sit there.
- Gather your documents: two years of tax returns and W-2s (or business returns if self-employed), recent pay stubs, mortgage statement, homeowner’s insurance declaration, and bank statements.
- Apply with our recommended lender (below) — and it never hurts to collect one comparison quote. The lender orders an appraisal or valuation of your home, underwrites, and opens the line.
- Go shopping. With the line open, your down payment is a checkbook entry away. We find the next home — and when it’s time, we also handle the rental side: pricing the rent, and connecting you with tenant placement or management.
8. Our Recommended Lender
We work with Michelle regularly and trust her with our own clients. She is a licensed loan officer and can answer every qualification and rate question specific to your situation — the things we, as your real estate team, are not licensed to advise on.
Michelle Russell — Loan Officer, RWM Home Loans
NMLS #242014
Phone: (760) 403-8066
Email: Michelle.Russell@rwmloans.com
Web: MichelleR.rwmloans.com
Tell her: “Joel and Christie Daniel at Greenleaf sent me — I’m exploring a HELOC to purchase my next home.” She’ll know exactly what you’re doing and will quote you both the HELOC and the fixed home-equity loan option so you can compare.
9. What We Do In This Process
This strategy has three moving parts — the value of your current home, the rent it will command, and the purchase of the next one. Our team covers all three: Christie is a certified residential appraiser, so the home value and rent numbers you plan around are real appraisal-grade numbers, not website estimates. Joel handles the purchase side and the rental strategy. One team, both licenses, no guessing.
Free next step: we’ll run your numbers.
Your home’s true value, realistic rent, your available equity, and the Section 5 math — no cost, no obligation. And if the numbers say don’t do it, we’ll tell you that too. That’s the whole point of this guide.
Call or text (951) 897-9466 — or email greenleafhomesjc@gmail.com and say “run my numbers.”
Joel Daniel, Broker — DRE #01868045 | Christie Daniel, Certified Residential Appraiser
Greenleaf Real Estate and Appraisal • (951) 897-9466 • greenleafhomesjc@gmail.com • exploringtemecula.com
Educational material only — not a loan offer, legal advice, or tax advice. HELOC rates cited are national averages as of July 2026 and change frequently; confirm current rates and qualification guidelines with a licensed lender. Consult a CPA regarding tax treatment. Rental income projections are estimates; actual results vary.