Cash-out refinancing converts home equity into liquid cash by taking a new, larger mortgage that pays off the existing one. The new loan carries a new rate, new term, and a balance that includes whatever cash you pulled out. It's one of the most powerful sources of low-rate borrowing available to homeowners — and one of the easiest ways to quietly unwind decades of equity if used without a plan.
The Thesis in One Sentence
A cash-out refinance works when the value of the cash (returned rate, investment yield, debt-interest savings, or essential expense) exceeds the long-term cost of interest on the larger loan — and when you have a specific, disciplined use for the proceeds.
How It Works
Say you have a San Diego home worth $1.2M with a $500K mortgage balance. That's $700K in equity. A cash-out refinance at 80% loan-to-value would give you a new $960K loan — paying off the $500K existing mortgage and delivering roughly $460K in cash at closing (minus closing costs and any payoff overlap).
The Math in Plain Numbers
Home value: $1,200,000
Current mortgage: $500,000
Max new loan (80% LTV): $960,000
Cash out to borrower (before costs): $460,000
Closing costs (~2.5%): $24,000
Net cash received: ~$436,000
Loan-to-Value Limits by Program
| Loan Type | Max Cash-Out LTV | Notes |
|---|---|---|
| Conventional (Fannie/Freddie) | 80% | Owner-occupied; investment properties capped lower |
| FHA Cash-Out | 80% | Full underwriting; requires 12 months of on-time payments |
| VA Cash-Out | 100% | Unique advantage; full equity access in most cases |
| Jumbo Cash-Out | 70-75% | Varies by lender and loan size |
The VA cash-out refinance is the outlier: 100% LTV cash-out is possible, meaning veterans can pull their full equity position. Conventional and FHA cap at 80%, leaving a 20% equity cushion in place.
Cash-Out vs. Alternatives
Before committing, run your numbers against the alternatives:
| Option | Typical Rate | Affects Primary Mortgage? | Best For |
|---|---|---|---|
| Cash-Out Refi | Current market + 0.125-0.375% | Replaces it | Large needs, plan to hold long-term |
| HELOC | Prime + 0-2% (variable) | No — second lien | Flexible access, shorter needs |
| Home Equity Loan | Fixed, ~2-3% above primary mortgage | No — second lien | Fixed-rate certainty, medium size |
| Personal Loan | 8-14%+ | No — unsecured | Small amounts, short term |
| Margin Loan (brokerage) | 5-10% | No | Portfolio-backed; tax strategies |
The Rate Environment Matters
If your current mortgage rate is below today's market (which applies to most pre-2022 San Diego borrowers), a cash-out refi means you're paying current rates on the entire balance, not just the cash-out portion. For a borrower with a $500K loan at 3.5% and $200K cash need, a HELOC at 8% on $200K costs dramatically less than a cash-out refi at 6.5% on $700K.
When Cash-Out Refi Makes Sense
- Your current rate is at or above today's market. No penalty for refinancing the base loan.
- You have a large, long-lived need — major home improvements, college tuition, a business opportunity with clear returns.
- You're consolidating high-interest debt and have the discipline to not re-incur it.
- Interest deductibility matters and the proceeds are used for home improvements (the IRS allows mortgage-interest deduction only on the portion used for home improvement, not general-purpose cash-out).
- You want to lock in a fixed rate on borrowed funds rather than a variable-rate HELOC.
When Cash-Out Refi Doesn't Make Sense
- You have a low fixed rate from 2020-2021 and a modest cash need. HELOC almost always beats cash-out here.
- You're planning to sell within 2-3 years. Closing costs don't amortize, and you're lowering your proceeds at sale.
- You don't have a specific use. "Just in case" cash-out refinances often become consumption. The interest keeps running regardless.
- You've already refinanced multiple times. Each cash-out resets amortization and compounds interest costs. Serial cash-out refis are how homeowners end up with no equity after 20 years of payments.
- Your cash-out purpose is a depreciating asset (a car, a boat, a wedding). Long-term amortization on short-term consumption is a bad match.
Costs and Tax Treatment
Closing Costs
Cash-out refinances typically run 2-4% of the loan amount in closing costs — slightly higher than rate-and-term because many lenders charge a "cash-out pricing adjustment" of 0.125-0.375% in rate or 0.5-1 point in fees.
Property Tax (California)
Refinancing does not trigger Prop 13 reassessment. Your property tax basis stays the same.
Mortgage Interest Deductibility
Under current IRS rules, mortgage interest is deductible only on the portion of the loan used to acquire or substantially improve the home. If you cash-out $200K and use $100K for a kitchen renovation and $100K to pay off credit cards, the interest on $100K is deductible; the interest on the other $100K is not. Keep records if this matters to your tax situation.
The San Diego Context
San Diego's appreciation since 2015 has created massive equity positions for long-term homeowners. A family that bought in 2016 at $650K in a median-price neighborhood likely has $600K+ in equity today. That creates real cash-out capacity — and real temptation.
The most common productive uses we see:
- Major home improvements (ADU construction, kitchen/bath remodels, seismic retrofitting)
- Funding down payment on a second property or investment
- Consolidating high-interest debt when the borrower has a clear repayment plan
The most common problematic uses:
- Lifestyle consumption (travel, cars, renovations without clear ROI)
- Paying off debt without addressing the habits that created it
- Investing proceeds in speculative assets
Process and Timeline
- Get an equity estimate. Recent comp pricing or a broker's opinion of value.
- Pre-qualify at 2-3 lenders. Cash-out pricing varies more than rate-and-term.
- Submit full application. Cash-out requires full underwriting — tax returns, pay stubs, asset statements.
- Full appraisal. Required on cash-out; can add 10-14 days.
- Underwriting. Stricter than rate-and-term; 2-4 weeks typical.
- Closing. Primary residence cash-out has a mandatory 3-business-day rescission period before funds release.
Typical total timeline: 35-50 days, longer than rate-and-term or streamlines.
Common Mistakes
- Not running the HELOC alternative. For borrowers with low fixed rates on the primary, HELOC math usually wins.
- Cashing out without a plan. The interest meter starts immediately.
- Underestimating closing costs. Cash-out pricing adjustments can add 0.125-0.375% to the rate or $5K+ in fees.
- Missing the tax-deductibility nuance. Non-improvement cash-out isn't deductible. Document uses carefully.
- Resetting a nearly-paid-off loan. If you have 8 years remaining on your mortgage, a new 30-year cash-out adds 22 years of interest payments.
The Bottom Line
Cash-out refinancing is a powerful financial tool when the math works and the use is disciplined. For San Diego homeowners with substantial equity and a specific, productive purpose — particularly VA-eligible borrowers who can access 100% LTV — it can be the cheapest source of large-scale borrowing available.
But the structural risk is real: cash-out refis quietly reset the amortization clock and add decades of interest to cover short-term needs. Before pulling the trigger, run the same dollars against a HELOC and a home equity loan. Often the second-lien products win — especially for anyone with a pre-2022 mortgage rate.
If you're weighing this decision, start with the refinance calculator to model the new payment, then compare against a HELOC scenario. The right answer becomes obvious once the numbers are on the page.