Second Mortgage vs Cash-Out Refinance: Which Costs Less?

TL;DR: A second mortgage (home equity loan or HELOC) is a new, separate loan on top of your current mortgage, so your original rate stays untouched. A cash-out refinance replaces your entire mortgage with a new, larger one, which means your whole balance moves to today's rate, not just the cash you pull out. If your current mortgage rate is below 5% and today's rates are near 7%, a second mortgage usually costs less over time.

_Last reviewed: August 2026 · 7 min read_

You need cash for a roof, a kid's tuition, or debt payoff, and your home has equity sitting in it. The confusing part is that two very different loans get pitched as the same solution, and picking the wrong one can cost you thousands over the life of the loan.

Okoniq Property Hub helps homeowners track their mortgage balance, equity, and payment history in one place, so you know your real numbers before you talk to a lender.

What's the actual difference between a second mortgage and a cash-out refinance?

A second mortgage adds a new loan behind your existing one, while a cash-out refinance replaces your existing mortgage entirely. With a second mortgage, either a home equity loan or a HELOC, you keep your current mortgage exactly as it is, rate and all, and take out a separate loan against your equity. You end up with two payments each month.

A cash-out refinance pays off your current mortgage and rolls it into a brand-new, larger loan that includes the cash you're taking out. You end up with one payment, but it's calculated at whatever rate is available today, applied to your entire balance, not just the new money.

This matters most when there's a gap between your existing rate and current market rates. If you locked in 3.25% in 2021 and today's rates sit around 6.8%, refinancing means giving up that 3.25% on your whole balance, not just the amount you're pulling out. For a deeper side-by-side on the home equity loan option specifically, see home equity loan vs HELOC.

Which one costs less in closing fees and interest?

A second mortgage typically has lower closing costs and preserves your low rate, while a cash-out refinance often has higher closing costs but sometimes a lower blended rate if your original loan was already expensive. Second mortgages usually close for $500 to $2,000 in fees since there's no need to pay off and re-originate the entire loan. Cash-out refinances run 2% to 5% of the total new loan amount, since you're refinancing everything, not just the cash-out portion, and that includes appraisal, title, and origination fees again.

Interest rates on second mortgages are usually 1% to 2% higher than a first mortgage rate, but that's only applied to the amount you borrow, say $40,000, not your full $300,000 balance. Run the numbers with refinance break-even calculator logic even for a second mortgage decision, since the math is similar: total upfront cost divided by monthly savings tells you the payback period.

| | Second Mortgage | Cash-Out Refinance | |---|---|---| | Original mortgage rate | Untouched | Replaced entirely | | Closing costs | $500–$2,000 | 2%–5% of new loan | | Number of payments | Two | One | | Best when | Original rate is well below market | Original rate is at or above market |

For the HELOC-specific comparison against refinancing, HELOC vs cash-out refinance covers variable-rate mechanics in more detail.

How do monthly payments and loan terms compare?

Second mortgages come with shorter terms and often variable rates, while cash-out refinances reset your entire mortgage to a fresh 15 or 30-year term. A home equity loan is usually fixed-rate over 5 to 20 years, giving you predictable payments. A HELOC starts with a variable-rate draw period of 5 to 10 years, then converts to repayment, which can mean payment jumps if rates rise during the draw period.

A cash-out refinance restarts your amortization clock. If you're 8 years into a 30-year mortgage and refinance into a new 30-year loan, you're back to year one, paying mostly interest again for a while. Check your current position first with an amortization schedule so you know how much equity and progress you'd be resetting.

If you're weighing a fixed monthly payment against a variable one, when an adjustable-rate mortgage makes sense walks through the tradeoffs that also apply to HELOC decisions.

Does it matter if I'm planning to sell or move soon?

Yes, timeline changes which option makes sense, because closing costs need time to pay off through savings or reduced interest. If you plan to sell within 3 years, a second mortgage's lower upfront cost usually wins, since you won't be around long enough to benefit from any rate improvement a refinance might offer. Should I refinance if I'll move in 3 years? breaks down the same break-even logic that applies here.

A cash-out refinance makes more sense if you're staying 7+ years and your current rate is actually higher than today's market rate, a rare situation in 2025 but still relevant for anyone who bought in 2023 or early 2024 at 7%+ rates.

What about PMI or existing loan terms that could complicate things?

If your current mortgage still carries PMI, refinancing could reset or extend it, while a second mortgage leaves your PMI situation untouched. Check how PMI works and when it drops before assuming a refinance clears it. Some homeowners refinance specifically to eliminate PMI once they've crossed 20% equity, which changes the math in favor of a cash-out refi even with higher rates. Also check your current loan for a prepayment penalty before choosing either route, since paying off your original mortgage early through a refinance could trigger a fee some loans still carry.

FAQ

Is a second mortgage the same as a home equity loan?

Not exactly. A second mortgage is the broad category, and a home equity loan is one type of second mortgage with a fixed rate and lump sum. A HELOC is the other type, with a variable rate and a draw period.

Can I get a cash-out refinance with bad credit?

It's harder but possible, usually requiring a credit score above 620 for conventional loans and 580 for FHA cash-out refinances, though FHA options come with mortgage insurance costs that add up over time.

How much equity do I need for either option?

Most lenders require you to keep at least 20% equity after the loan, meaning if your home is worth $400,000, you generally can't borrow past $320,000 combined between your first mortgage and any new loan.

Will a second mortgage hurt my credit score?

Applying causes a temporary dip of a few points from the hard inquiry, and carrying two mortgage payments increases your debt-to-income ratio, which lenders check on future applications like an auto loan or another property purchase.

Which option is faster to close?

A second mortgage typically closes in 2 to 4 weeks since there's no full loan payoff involved, while a cash-out refinance takes 30 to 45 days because it involves the same underwriting as an original mortgage.

This is educational information, not financial advice. Talk to a mortgage loan officer or fee-only financial advisor about which option fits your specific rate, equity, and timeline.