Turning a Second Home Into a Rental: Tax Tips to Avoid Trouble

With mortgage rates keeping many owners in their second homes longer than planned, more people are asking whether that lake house or ski condo could earn its keep as a rental.

It’s a reasonable move, but the day you start renting it out, the tax and legal rules that apply to the property change in ways that catch a lot of owners off guard, from how the IRS classifies your personal use of the place to what your insurer needs to hear about before a guest checks in.

This guide walks through the depreciation and reporting rules that kick in once a second home starts earning rent, the permits and coverage most owners overlook, and what’s worth weighing before committing to the switch.

The 14-Day Rule Most Owners Have Never Heard Of

The IRS treats a second home used purely for your own enjoyment very differently from one rented out for income, and the line between the two comes down to personal use.

If you stay under 14 days a year, or 10% of the days it’s rented, whichever is greater, the property is generally treated as a rental, letting you deduct losses within normal passive-activity limits. Cross that line, and it becomes a vacation home instead, which caps deductible expenses at whatever rental income you actually bring in.

Additionally, depreciation starts on the conversion date, not the purchase date. Your depreciable basis is the lower of your adjusted basis, purchase price plus improvements minus any prior depreciation, or the property’s fair market value the day it becomes a rental. Furthermore, only the structure counts since land isn’t depreciable.

For the exact thresholds and worked examples, IRS Publication 527 is the primary source worth a skim before you file.

Where the Real Money Sits

Rental income and expenses land on Schedule E, separate from your regular household finances. It covers mortgage interest, property taxes, landlord insurance, repairs, management fees, and depreciation on the structure itself.

If you convert partway through the year, you’ll need to prorate between the personal-use months and the rental months rather than deducting the full twelve. Estimating the expected monthly rent can also help owners determine whether rental income will cover the property’s ongoing expenses and generate positive cash flow.

For some owners, this is also where a cost segregation study comes in. 

Dylan Scandalios, Co-Founder of Seneca Cost Segregation, explains: 

“Most people depreciate the whole building over 27.5 years by default, but a lot of what’s inside it doesn’t need to wait that long. A cost segregation study separates out the parts that qualify for shorter recovery periods, so more of the deduction comes in the early years of ownership, which is usually when cash flow is tightest. It isn’t the right fit for every property or budget, and anything you accelerate gets recaptured when you sell, so it’s about timing rather than a permanent saving. That’s why it’s a conversation worth having with your accountant before you file your first rental year.”

Permits Come Before Guests

Most jurisdictions want to know about a rental before the first guest checks in, and skipping that step tends to surface later, usually at the worst time.

Depending on where the home sits, that can mean a short-term rental permit, registering to collect local lodging tax, confirming the zoning actually allows it, or working around an HOA that caps how often the unit can be rented. Some cities also require a local contact person on file for guest issues, which is easy to overlook until a neighbor complains.

There’s also the practical side of preparing the home for guests. Owners often need to remove personal belongings, seasonal gear, valuables, or excess furniture before listing the property, especially if they still plan to use the home themselves part of the year. Using off-site self-storage can keep those items accessible without taking up guest space.

Insurance needs the same update. A standard homeowner’s policy generally stops covering a home once it’s rented to guests, and most insurers want to hear about the change before a claim rather than after.

Also, check the mortgage, since many second-home loans carry an owner-occupancy clause. Renting without telling the lender can technically put you in breach of the loan even though the payments stay the same.

Deciding Whether Renting Is Even the Right Call

Before committing, it’s worth weighing renting your second home against simply holding the property or selling it outright. This guide to real estate exit strategies walks through how a rental conversion compares with alternatives like a 1031 exchange, which can save a lot of second-guessing later.

Whatever you decide, keep records of the conversion date, the fair market value at that point, and every expense and depreciation figure claimed afterward, along with receipts for repairs and improvements.

Depreciation deducted while the home was a rental gets recaptured and taxed at up to a 25% rate when it sells, separate from ordinary capital gains, and good records now are what make that number defensible later rather than a guess.

What It Comes Down To

A second home earning rental income can be a genuinely good move, and for many owners it turns an underused property into a source of steady cash flow. But it stops being a simple asset the moment the first guest books a stay, and treating it that way from day one avoids problems down the line.

Getting the basis and paperwork right early saves a lot more than it costs. A short conversation with an accountant before the first booking goes live is usually enough to avoid the most common and costly mistakes.