Buying a Second Home: Financing, Taxes, and Real Math

You have rented the same lake house three summers in a row, or the mountain cabin is now the place your kids ask to go back to. At some point the question becomes whether to buy. Buying a second home is partly a lifestyle decision and partly a financial one, and the mistake most buyers make is letting the first part answer the second.

This guide covers the financial side honestly: how second-home mortgages work, what the tax rules actually allow, how rental income changes the picture, and what it costs to carry a property you visit a few weeks a year. It also addresses the harder question of whether a second home fits alongside your retirement and other goals.

Everything here is educational rather than individualized advice. Property, tax, and lending rules vary by location and change over time, so confirm the details with your lender and tax professional before you sign a contract.

Second Home or Investment Property? The Lender Decides First

Mortgage underwriting sorts properties into three categories: primary residence, second home, and investment property. The category sets your down payment, your interest rate, and the rules for how you may use the house. Misrepresenting how you will use it to get better terms is mortgage fraud, so answer the question accurately.

A second home generally must be a reasonable distance from your primary residence, be occupied by you for part of the year, and be under your exclusive control, meaning not managed by a rental company under an agreement that limits your use. Lenders commonly require at least 10 percent down and price the loan slightly above a primary residence rate. An investment property usually requires 15 to 25 percent down, carries a higher rate, and lets the lender count expected rental income toward qualifying. The Consumer Financial Protection Bureau offers plain-language guidance on comparing mortgage offers.

You will also need to qualify carrying both mortgages. Underwriters will count your existing housing payment plus the new one against your income, and they typically want to see reserves, often two to six months of payments on the second property, in cash after closing.

Vacation Home Taxes: What You Can and Cannot Deduct

Buyers often assume a second home comes with generous tax benefits. The reality is more limited. The deductions that exist are the same ones that apply to your primary home, and they share the same caps.

Mortgage interest

You may deduct interest on mortgage debt used to buy, build, or improve a primary residence and one second home, up to a combined acquisition debt limit of $750,000 for loans taken out after December 2017. If your primary mortgage already uses most of that limit, little or none of the interest on the second home is deductible. The IRS details the rules in Publication 936. Interest on a home equity loan taken against your primary residence to buy the second home is not deductible, because the borrowed funds were not used to improve the home securing the loan.

Property taxes and the SALT cap

Property taxes on a second home count toward the state and local tax deduction, which is capped. The cap was raised for 2025 and is scheduled to adjust in later years, with a phase-down at higher incomes, so the benefit for many high earners is smaller than the headline number suggests. Our guide to the SALT cap and itemizing in 2026 explains how the cap works and who benefits.

No capital gains exclusion

The $250,000 or $500,000 exclusion for gain on the sale of a home applies only to your primary residence. A second home does not qualify unless you later move in and satisfy the two-of-five-year ownership and use test, and even then, the portion of gain attributable to years of non-qualified use after 2008 is taxed. Plan on paying long-term capital gains tax, plus the 3.8 percent net investment income tax if your income is high enough, when you eventually sell.

Renting It Out: The 14-Day Rule and What Follows

Many buyers plan to offset costs with rental income. The tax treatment depends on how many days the property is rented and how many days you use it personally. The IRS summarizes the rules in Topic 415.

If you rent the home for 14 days or fewer during the year, the rental income is not taxable and you do not report it, though you also cannot deduct rental expenses. This is sometimes called the Augusta rule, and for a property near a major event it can produce meaningful tax-free income.

Rent it for 15 days or more and the income is taxable. If your personal use exceeds the greater of 14 days or 10 percent of the days rented at fair value, the property is treated as a residence you also rent, and expenses are allocated between personal and rental days. Rental deductions are limited to rental income, so the property cannot generate a loss that offsets your salary. If personal use stays under that threshold, the property is treated as a rental, which opens depreciation and potential loss deductions but also subjects those losses to passive activity limits that most high earners cannot use in the current year.

• Days spent at the property doing repairs and maintenance full time do not count as personal use.
• Days a family member uses it, or anyone who pays less than fair rent, count as personal use.
• Keep a calendar. In an audit, the day count is the whole case.
• Short-term rentals in many cities and counties require permits, hotel taxes, and sometimes limits on rental nights.

The Real Cost of Owning a Vacation Home

The purchase price is the easy number. The carrying cost is what determines whether the property is a joy or a burden, and it is consistently underestimated. A reasonable rule of thumb is that a second home costs 3 to 5 percent of its value each year to own before the mortgage, and more for waterfront, mountain, or older properties.

Insurance deserves its own line. Coastal properties face windstorm coverage and flood insurance requirements, and premiums in many resort markets have risen sharply. Mountain properties may carry wildfire surcharges. Get insurance quotes before you make an offer, not after. Because a second property increases your liability exposure, review your umbrella liability coverage at the same time.

• Property taxes, which are often higher on non-homestead property because you cannot claim the primary residence exemption.
• Homeowners, flood, and windstorm insurance.
• HOA or resort fees, which can run several thousand dollars a year.
• Maintenance and repairs, typically 1 to 2 percent of value annually, plus a caretaker or property manager if you live far away.
• Utilities, internet, security monitoring, and lawn or snow service that runs whether you are there or not.
• Furnishing the house, which can easily exceed $30,000 for a property you plan to rent.
• Travel to get there, which is the cost buyers most often forget.

Is Buying a Second Home a Good Investment?

The honest answer is usually no, not compared with a diversified portfolio, and that is fine if you are buying it for the right reasons. Housing appreciation over long periods has run modestly above inflation, while carrying costs of 3 to 5 percent a year consume most of that gain. Rental income can help, but a property that is rented heavily enough to cover its costs is often one you do not get to use during the weeks you want it.

A better way to frame the decision is as a consumption choice with a residual asset. Estimate what you would spend renting comparable places each year, compare it to the full carrying cost plus the opportunity cost of the down payment, and decide whether the difference is worth the ownership benefits: certainty, familiarity, a place to gather family, and possibly a future retirement home.

Run the numbers with a long horizon. Our future value calculator shows what the down payment and annual carrying costs would grow to if invested instead. If the property still wins on the lifestyle side after you see that number, you are buying with clear eyes.

Fitting a Second Home Into the Rest of the Plan

The right time to buy a second home is after retirement contributions are maxed, the emergency fund covers both properties, and the purchase does not require selling appreciated investments in a way that creates a large tax bill. If any of those are not true, the property is competing with goals that matter more.

Think about the exit as well. Will you keep the home into retirement, sell it when the kids are grown, or pass it to the next generation? A property held until death receives a step-up in basis, which erases the capital gain, but a house shared among adult children without a written agreement becomes a common source of family conflict. If the plan is to keep it in the family, an LLC or trust structure drafted by an estate planning attorney can set the rules for use, expenses, and buyouts in advance.

Finally, consider ownership titling and how the property fits your estate documents. Property in another state may require a separate probate proceeding there unless it is held in a trust or LLC. These are details our financial planning team coordinates with your attorney, and they are far easier to arrange at purchase than years later.

A second home can be one of the best purchases a family makes, or one of the most expensive hobbies. The difference is rarely the property itself. It is whether the buyer understood the financing category, the limits on tax deductions, the rental rules, and the true carrying cost before signing. Do that work first, make sure your retirement and other goals are funded, and then buy the place because you will use it and love it. That is the honest math, and it is the version that ages well.

Tony Colunga · Founder, Attend Wealth

Tony leads Attend Wealth, a fee-based wealth management firm in Atlanta serving professionals, families, physicians, and business owners. Advisory services are held to a fiduciary standard. More about Attend