Clients often come to me asking for my take on financial advice they’ve picked up elsewhere. A sibling swears by a strategy that “changed everything.” A colleague shares something that’s working right now. Or they forward a social media clip with a quick, “What do you think about this?”

That last one happens a lot, and frankly, this is one of the underrated benefits of having an advisor. You don’t have to guess. You can sanity-check ideas before acting on them.

One concept that comes up repeatedly is the idea of using debt as a tool for investing. A few weeks ago, a client sent me an Instagram reel from a popular personal finance podcaster who laid out a confident, simplified case for why borrowing against home equity can be a powerful wealth-building move. It sounded smart, and parts of what he said weren’t wrong. But he’s not a Certified Financial Planner, and there were significant gaps in his recommendations.

The Pitch: Borrowing Against Your Home’s Equity to Invest

You’ll hear this framed as a smart, almost obvious move once you understand it. The logic is clean, the math looks compelling, and it’s usually delivered with a lot of confidence. The advice starts with a framing that immediately grabs attention: debt isn’t inherently bad (which I agree with); it can actually function like income if used “correctly.” The argument hinges on borrowing against an appreciating asset, avoiding taxes in the process, and investing the borrowed money for a higher return.

The example he provided goes something like this. Imagine you bought a home several years ago for $450,000. Over time, the value rises to $720,000. Instead of selling, you can tap into the equity and take out $120,000 through a cash-out refinance at roughly a 6.5% interest rate. And that money hits your bank account tax-free because loan proceeds aren’t considered income.

Next, you invest that $120,000 into a broad stock market index fund, which you can assume to earn around 9–10% annually over the long term. Over 30 years, the math looks compelling. You might pay back roughly $250k in total principal and interest on the loan, while the invested funds grow to well over $2 million.

The takeaway, according to the advice, is that “good debt” acts as a multiplier. You’re using other people’s money to grow your net worth, keeping liquidity intact, and avoiding current taxes. Do it carefully, manage leverage, and this approach, at least on paper, can dramatically increase wealth.

Now, here’s where I want to slow things down.

He’s right about one key point: you can borrow against home equity without triggering taxes, and you can invest those proceeds. 

But this strategy makes several major assumptions and glosses over some serious downsides. I know this because I did something very similar with my first home and learned the hard way. 

The Assumptions Beneath the Math

The first red flag is how aggressive the home appreciation assumption is. In the example, a $450,000 home appreciates by $270,000, reaching a value of $720,000 in a relatively short period of time. That kind of growth can happen, but it’s far from guaranteed, especially in today’s higher-rate, slower-moving housing market.

This strategy also assumes that home values move only in one direction. Markets don’t work that way. Areas that see fast appreciation (i.e., hot, volatile markets) can reverse just as quickly. If your original mortgage was $360,000 and you later pulled out $120,000, your total debt is now $480,000. If the property value slides back toward $500,000 at some point along the way and you need to sell within a few years, most of that paper gain disappears after commissions and closing costs.

Now layer in market risk. If the stock market has a couple of down years early on, as it periodically does, you could be down on the investment and overleveraged on the house at the same time. 

That’s what the simplified math skips over.

The Cash Flow and Tax Reality Check

Don’t forget: Borrowing against your home doesn’t just change your balance sheet; it also changes your monthly obligations. A larger mortgage means a higher required payment, which raises your fixed monthly expenses. And the amount you must pay each month matters, especially if you lose your job, you’d like to start a business, one partner wants to stay home with the kids, or you want to consider an earlier retirement. 

I generally advise keeping your baseline as low and flexible as possible, especially as you near retirement.

This approach also assumes a very long runway. The math only works cleanly if you hold the property for roughly 30 years and markets cooperate. Stock returns don’t follow a smooth 9–10% line every year. If you need to sell the home sooner due to a job change, family needs, or a market shift, the strategy can unravel quickly with big downsides.

Taxes are another missing piece. The growth of the investment portfolio isn’t tax-free. Capital gains could easily shave 20% or more off the upside. If this is a rental property and you’re claiming depreciation, part of the gain may be taxed at ordinary income rates due to depreciation recapture.

My takeaway? This isn’t a home run. There’s no free lunch in finance. Higher returns require higher risk, and this strategy carries more of it than the simplified version suggests.

The Double-Edged Sword of Leverage

I don’t want you to shy away from using leverage altogether. It can be a powerful financial tool. But I do want to caution you and make you keenly aware that it cuts both ways. 

Here’s another example to illustrate what can happen.

Say you buy a $1 million home and put 10% down, or $100,000. If the home appreciates to $1.1 million in one year and you sell, it looks like a home run. You made $100,000 on a $100,000 investment—a 100% return.

But you never know when real life will get in the way of clean math. After moving costs, closing costs, carrying expenses, and potential capital gains taxes (if this is a rental), that $100,000 gain may be closer to $50,000. A 50% return in one year is still excellent, but it’s not the doubling that the strategy enthusiasts suggest.

Now flip the scenario. If the home drops just 10% due to a financial crisis or some other factor outside of your control and sells for $900,000, your entire $100,000 down payment is gone. That’s a 100% loss. And in a real downturn, prices don’t always stop there.

This is exactly what fueled the housing crisis from 2007 to 2009. Many homeowners had to sell for less than their mortgage balances, leaving them without cash to cover the difference; leverage shifted from a wealth accelerator to a financial trap. 

Why Context, Experience, and Judgment Matter

Strategies like this tend to sound compelling because they’re built on selective truths. Yes, you can borrow against home equity. Yes, those proceeds aren’t taxed upfront. Yes, markets tend to rise over time. None of that is wrong on its own.

The problem is what gets left out.

Real financial decisions don’t happen on spreadsheets. They happen alongside job uncertainty, family obligations, changing goals, and markets that don’t move in straight lines. When you combine leverage, housing, and investing, you’re tying multiple risks together and reducing your margin for error at the same time.

That’s why I don’t evaluate ideas like this by asking, “Could this work?” I ask, “What happens if it doesn’t, and how painful is that outcome?” For many, the downside matters more than the theoretical upside.

If you come across advice like this and feel torn between excitement and unease, that’s a good instinct. Big financial decisions deserve more than confident delivery and clean math. They deserve context, judgment, and a clear understanding of what’s at risk, not just what’s possible.

Lake Road Advisors (LRA) is a virtual wealth management firm headquartered in Corning, NY, with offices in Ithaca, NY, and Vancouver, WA. Founded by Paul Sydlansky, CFP®, in 2016, it serves successful couples planning their next chapter—whether that’s retirement, part-time work, or a less demanding second act. Paul has worked in the financial services industry for 25+ years. Prior to founding Lake Road Advisors, he worked at Morgan Stanley in Manhattan for 13 years, where he was a senior-level manager within the Institutional Equities Department. In 2018, he was named to Investopedia’s Top 100 Financial Advisors list. Paul received a Bachelor’s degree in Economics from Marist College and holds an MBA from New York University Leonard N. Stern School of Business. Paul is a CERTIFIED FINANCIAL PLANNER® and a member of the National Association of Personal Financial Advisors (NAPFA) and the XY Planning Network. They can be reached by phone at the Corning, NY office at (607) 438-2914, Ithaca, NY office at (607) 463-8400, or Vancouver, WA office at (607) 292-2172 or at the firm’s website at https://www.lakeroadadvisors.com/

This material has been edited with the assistance of artificial intelligence tools. The information presented is based on sources believed to be reliable and accurate at the time of publication. This material is for educational purposes only and does not necessarily reflect the views of the author, presenter, or affiliated organizations. It should not be construed as investment, tax, legal, or other professional advice. Always consult a qualified professional regarding your specific situation before making any decisions.