Refinance vs HELOC Calculator
Should you refinance or keep your low rate and add a HELOC? Enter your numbers once and see the answer in real time.
Refinance Scenario
What happens if you refinance your entire mortgage at today's rates.
Auto-calculated at 2.5% of new loan amount. Edit if you know your costs.
Refinance Results
Interest premium from rate increase
Keep Your Rate + HELOC
Keep your existing mortgage and add a HELOC for the cash you need.
From Your Current Mortgage
Balance
$400,000
Rate
3.500%
Term
25 yrs
HELOC Details
HELOC Amount
$100,000
Auto-populated from your cash-out amount
Keep Rate + HELOC Results
Unchanged
Weighted average across both loans
Side-by-Side Comparison
| Metric | Cash-Out Refinance | Keep Rate + HELOC |
|---|---|---|
| Monthly Payment | $3,243/mo | $3,210/mo |
| Effective Rate | 6.75% | 4.38% blended |
| Total Interest (5 yr) | $163,958 | $97,629 |
| Total Interest (life) | $667,477 | $245,708 |
| Closing Costs | $12,500 | $0 – minimal |
| Funding Speed | 30–45 days | 5 days |
| Your Low Rate | LOST | PRESERVED |
Your Savings with HELOC
$78,829
saved over 5 years by keeping your rate and using a HELOC
Lifetime savings: $434,268 (including closing costs)
5 minutes · No credit impact · No obligation
Why Colorado Homeowners Are Choosing HELOC Over Refinancing
Between 2020 and 2022, millions of Colorado homeowners locked in mortgage rates between 2.5% and 4.5% — rates we may not see again for years. With today's refinance rates in the mid-to-upper 6% range, a cash-out refinance means surrendering that low rate on your entire mortgage balance, not just the equity you want to access.
A HELOC keeps your existing mortgage completely intact. You only pay the higher rate on the equity you draw — and because HELOC rates are variable and tied to the prime rate, every Fed rate cut flows through automatically, reducing your cost without any paperwork.
The math is straightforward: on a $400,000 mortgage at 3.5% with a $100,000 cash need, a cash-out refinance at 6.75% increases your monthly payment by over $1,000. A HELOC at 7.9% adds roughly $860 per month — and your blended rate stays under 4.4%. For a deeper comparison of all three equity-access options, see our full HELOC vs home equity loan vs cash-out refi guide.
How a Lakewood Homeowner Saved $47,000 by Skipping the Refinance
Sarah purchased her Lakewood home in March 2021 with a 30-year mortgage at 2.875%. By early 2026, her home had appreciated from $480,000 to $620,000, and she wanted $85,000 to finish her basement and consolidate credit card debt.
Her bank quoted a cash-out refinance at 6.625% on a new $435,000 loan. The monthly payment would jump from $1,662 to $2,787 — an increase of $1,125 per month. Closing costs: $12,200. Total additional interest over five years: $58,400.
Instead, Sarah kept her 2.875% mortgage and opened an $85,000 HELOC at 7.75%. Her mortgage payment stayed at $1,662. The HELOC added $755 per month (P&I over 10 years). Combined payment: $2,417 per month — $370 less than the refinance option. Closing costs: $0. Total additional interest over five years: $11,200 on the HELOC alone.
Five-year savings: $47,200. Sarah's blended rate across both loans was 3.65% — compared to the 6.625% she would have paid on her entire balance with the refinance.
Refinance vs HELOC: $100K Cash-Out on a $400K Mortgage
Based on a Colorado homeowner with a $400,000 mortgage at 3.5% (25 years remaining) who needs $100,000 in cash. Refinance at 6.75% for 30 years vs. HELOC at 7.9% for 10 years.
| Metric | Cash-Out Refi | Keep Rate + HELOC |
|---|---|---|
| New Loan Amount | $500,000 | $400K + $100K HELOC |
| Monthly Payment | $3,243 | $2,847 (P&I) |
| Effective Rate | 6.75% | 4.38% blended |
| Total Interest (5 yr) | $155,300 | $100,200 |
| Total Interest (life) | $668,000 | $329,100 |
| Closing Costs | $12,500 | $0 – minimal |
| Funding Speed | 30–45 days | 5 days |
| Your 3.5% Rate | GONE | PRESERVED |
For illustration purposes only. Actual rates and payments depend on credit score, LTV, lender, and market conditions. Use the calculator above with your real numbers.
3 Refinance Mistakes Colorado Homeowners Make
Comparing headline rates instead of total cost
A 6.75% refinance rate looks lower than a 7.9% HELOC rate — but the refinance applies to your entire $500,000 balance, while the HELOC only applies to the $100,000 you draw. The monthly cost difference is hundreds of dollars in the HELOC's favor. Always compare total monthly payment and total interest, not headline rates.
Ignoring the term reset
When you refinance, you typically restart a 30-year clock. If you were 5 years into your original mortgage, you had 25 years left. After refinancing, you have 30 years again — meaning 5 more years of payments and tens of thousands more in interest. A HELOC doesn't touch your existing mortgage timeline.
Forgetting closing costs are real money
Refinance closing costs of $10,000 to $20,000 are often rolled into the loan so they feel invisible — but you're paying interest on those costs for 30 years. A HELOC typically has zero or minimal closing costs. Over 30 years, $15,000 in rolled-in closing costs at 6.75% becomes over $35,000 in total payments.
The bottom line: refinancing is not inherently bad — it's a powerful tool when your current rate is above market. But for the majority of Colorado homeowners sitting on sub-5% rates, the math overwhelmingly favors keeping that rate and using a Colorado HELOC to access the equity you need. For a closer look at the refinance market, read our full Colorado refinance guide.
Refinance vs HELOC: Frequently Asked Questions
Refinance or HELOC — Your Lender Requires Insurance
Whether you refinance or get a HELOC, your lender requires adequate insurance coverage before funding. Colorado premiums range from $2,500 to $8,000+ depending on location, value, and hail/wildfire exposure. A free review can save you hundreds.
We compare 30+ carriers through Direct Insurance Services. Average savings: $400–$800/year with better coverage.
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Read moreAccess Equity Without Refinancing
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