Second-home buyers are making these costly financial mistakes, advisors warn

Second-home buyers are navigating one of the most demanding lending environments in years. The average second home mortgage rate stood at 7.60% as of April 2026, according to data from Curinos — approximately 0.50 to 0.75 percentage points higher than primary residence rates — while lenders now typically require between 10 and 20% down and up to six months of combined mortgage payments in cash reserves after closing, according to Fannie Mae and Freddie Mac conforming loan guidelines. The result is a market in which the gap between being able to make a payment and being financially prepared for ownership has never been wider. Four financial advisors say their clients are still making the same avoidable mistakes — and that the conversations advisors need to have are more urgent than most buyers realize.

Draining liquidity for the down payment is the classic trap

Mallon FitzPatrick, managing director and head of wealth planning at Robertson Stephens, says the most common mistake he sees is buyers depleting their cash reserves to fund the down payment, leaving them house-rich and liquidity-poor before the first mortgage payment clears.

"A common mistake is using up most of the liquidity for the down payment and not keeping enough in reserve," FitzPatrick said. "Some buyers also try to call an investment property a vacation home to get a better rate, which can backfire and cause real problems during underwriting. Lenders view second homes as a luxury, not a necessity, so they want to see deep pockets, not just a big down payment."

FitzPatrick also raises a misclassification risk that he sees more frequently as buyers stretch to qualify: intentionally describing an investment property as a vacation home to access the less stringent lending requirements that apply to owner-occupied second homes. The difference matters — under Fannie Mae and Freddie Mac guidelines, investment properties require larger down payments and higher reserves than true second homes, and misrepresenting occupancy intent to a lender constitutes mortgage fraud, a federal offense under 18 U.S.C. § 1014.

"Cash is king in today's second-home market as buyers look for ways to bypass interest rate sticker shock. Vacation homes are driven by emotion, but investment properties are driven by spreadsheets. That's why higher rates are hitting landlords much harder than vacationers," FitzPatrick said.

For clients who want a property that serves dual purposes — personal sanctuary and occasional rental — FitzPatrick recommends modeling both use cases carefully and building in a layer of creditor protection from the start. He advises holding rental properties inside a limited liability company formed in the state where the property is located. 

Projecting rental income as guaranteed cash flow is dangerous

Jamie Hopkins, chief executive officer of Bryn Mawr Trust Advisors LLC and chief wealth officer at WSFS Bank, frames the second-home mistake not as a math problem but as a mindset problem. Too many buyers, in his view, run their affordability calculations based on a best-case scenario — full occupancy, cooperative weather, stable local regulations — and never ask what happens when those assumptions break.

"Too many buyers build their entire affordability calculation around projected rental income. That is dangerous. Rental markets can weaken, local regulations can change, occupancy rates can fall, and economic downturns can impact travel demand almost overnight," Hopkins said. "If the property only works financially when everything goes right, it is probably too much house."

Hopkins also flags what he calls the single biggest blind spot in second-home planning today: insurance. Premiums in coastal and disaster-prone markets have surged dramatically in recent years, and buyers routinely budget using outdated cost assumptions — only to discover the actual premiums bear no resemblance to what they modeled. A comprehensive review of all carrying costs, including insurance, property taxes, HOA fees, maintenance, utilities, and furnishing expenses, should be completed before the purchase decision is made, not after. A 2026 second-home ownership guide from AmeriSave estimates that total ownership costs for a second home typically run 50% above the mortgage payment alone. 

Pre-closing financial moves can derail underwriting

Aaron Leak, founder and wealth anager at ECL Private Wealth Management, focuses his clients on a category of mistake that happens before the property is ever found: taking on new debt, making large purchases, or letting cash reserves slip below qualifying thresholds during the pre-approval window.

"Higher rates have definitely made buyers more selective," Leak said. "Clients buying a vacation home are typically doing it for the lifestyle, while investment buyers are much more focused on whether the property will generate positive cash flow. With financing costs higher, the numbers have to make sense."

Beyond the mortgage qualification itself, Leak emphasizes that most buyers systematically underbudget for the ongoing carrying costs that follow closing. He builds those expenses — insurance, property taxes, HOA dues, maintenance, utilities, furnishings, and repairs — into the financial plan before his clients begin their search, so the total ownership cost is visible before an emotional attachment to a specific property clouds the judgment. He also recommends evaluating a securities-based lending strategy as an alternative to liquidating invested assets for a down payment, depending on the client's portfolio composition and rate environment. 

Tax consequences of funding a down payment are often overlooked

Tracy Byrnes, vice president of women and investing at Lebenthal Global Advisors, zeroes in on a planning gap that often appears only after a client has already committed: the capital-gains bill triggered by liquidating appreciated investments for a down payment.

"Don't forget, a large stock sale can create a significant capital-gains bill just as cash needs are rising," Byrnes said. "Another mistake is assuming the property will 'pay for itself' through rental income. If rental income is part of the plan, the numbers should work under conservative assumptions, not peak-season projections."

Byrnes also raises the tax classification question that determines which deductions are actually available. The IRS applies different rules to properties classified as true second homes, full rental properties, and hybrid properties used for both personal and rental purposes. Under current IRS guidance, a property used personally for more than 14 days or more than 10% of the days it is rented — whichever is greater — is classified as a personal residence rather than a rental property for tax purposes, which limits the deductibility of rental expenses and losses. Buyers who assume mortgage interest, expenses, and losses will all be deductible without understanding the classification rules first are frequently surprised by the outcome.

"Don't ask whether you can afford the second home in a good year. Ask whether you can comfortably carry it in a bad one — when insurance jumps, something breaks, rental income disappoints, and the market is down. A second home should add to your life, not derail your already existing financial plan," Byrnes said.

The four advisors collectively describe a market in which the gap between wanting a second home and being financially ready for one is wider than it has been in more than a decade. The combination of elevated mortgage rates, stricter lender scrutiny, surging insurance costs, and complex tax treatment means the pre-purchase planning conversation is no longer optional — it is the work that determines whether the purchase is a sound investment or a source of sustained financial stress.