Tax deductions on a land loan depend entirely on how the land is used, and in the most common scenario — buying a lot for personal use without starting construction — the interest is not deductible at all. Land held for investment, land under active construction for your home, and land used in a trade or business each follow a different rule, with its own limits and its own paperwork. Sorting out which category your parcel falls into matters more than any other tax choice you’ll make on the purchase.
Personal-Use Land: No Interest Deduction
If you borrow to buy land you plan to build on someday but haven’t started construction, the interest is nondeductible personal interest. The IRS states this directly: “No, you can’t deduct interest on land that you keep and intend to build a home on.”1Internal Revenue Service. Real Estate Taxes, Mortgage Interest, Points, Other Property Expenses The deduction opens up only once construction actually begins.
The same result applies to land bought for personal enjoyment — a lakefront lot, hunting acreage — that you don’t intend to develop or hold for appreciation. Interest on personal debt is not deductible unless it qualifies as mortgage interest on a home you already live in.2Office of the Law Revision Counsel. 26 U.S. Code 163 – Interest Many buyers only discover this after a year of payments, which is why the classification question is worth settling before you close.
Building a Home on the Land
Once construction starts, the tax treatment changes. The IRS lets you treat a home under construction as a qualified home for up to 24 months, and during that window the interest on your land and construction loans can qualify as deductible mortgage interest. Two conditions: the 24-month clock starts on or after the day construction begins, and the home must actually become your qualified residence when it’s ready for occupancy.1Internal Revenue Service. Real Estate Taxes, Mortgage Interest, Points, Other Property Expenses If the build runs past 24 months, or you never move in, interest from that period loses its deductible status.
The statute defines deductible acquisition indebtedness as debt incurred in acquiring, constructing, or substantially improving a qualified residence and secured by that residence.2Office of the Law Revision Counsel. 26 U.S. Code 163 – Interest In practice, the land loan and construction financing are usually rolled together or refinanced into a construction-to-permanent mortgage. The combined debt eligible for the interest deduction is capped at $750,000 for single filers and married couples filing jointly, or $375,000 for married filing separately.3Internal Revenue Service. Publication 936 – Home Mortgage Interest Deduction That cap covers the land loan and construction debt together, so an expensive lot eats into the amount of construction financing that qualifies.
The rule also works for a second home. The tax code allows interest deductions on one primary residence and one additional residence you select for the tax year, if you meet the usage requirements.4Internal Revenue Service. Revenue Ruling 2010-25 Keep records of the construction start date and the occupancy date. Those are the two facts that determine whether the interest qualifies.
Investment Land: Interest Capped by Investment Income
If you buy land purely for appreciation, with no plans to build or farm, the interest falls into a separate bucket: investment interest. It’s deductible, but only up to the amount of your net investment income for the year.2Office of the Law Revision Counsel. 26 U.S. Code 163 – Interest That income includes ordinary interest, non-qualified dividends, annuities, and royalties from your portfolio. It does not automatically include long-term capital gains or qualified dividends, which get preferential tax rates.
There’s a tactical choice available. You can elect to include your net capital gains and qualified dividends in investment income, which increases your deductible interest for the year. The tradeoff: those gains lose their favorable long-term capital gains rate and are taxed as ordinary income instead.5Internal Revenue Service. Form 4952 – Investment Interest Expense Deduction Whether the swap pays off depends on the spread between your ordinary rate and the capital gains rate, and on how much interest you’re trying to deduct. For most people holding land that generates no revenue, the math only works in years with significant capital gains from other investments.
Any investment interest you can’t deduct in the current year isn’t lost. It carries forward to future tax years and becomes deductible when your investment income catches up.6Internal Revenue Service. About Form 4952, Investment Interest Expense Deduction You report the calculation on IRS Form 4952, which tracks both the current-year deduction and the carryforward balance. Land investors who hold parcels for years before selling should file this form annually to preserve the deduction for the year they eventually realize a gain.
Business and Farm Land
Land used in a trade or business gets the cleanest treatment. Interest on a loan for farmland, ranch property, or a commercial development site is an ordinary business expense, deductible directly against the income the business generates.7Office of the Law Revision Counsel. 26 U.S. Code 162 – Trade or Business Expenses There’s no requirement to match the deduction to a specific type of income. The interest simply reduces taxable business income.
Sole proprietors report business interest on Schedule C, which has dedicated lines for mortgage interest and other interest.8Internal Revenue Service. Schedule C (Form 1040) – Profit or Loss From Business Farmers and ranchers use Schedule F instead, reporting land loan interest on Line 21a (for mortgage interest reported on a Form 1098) or Line 21b (for other interest).9Internal Revenue Service. Schedule F (Form 1040) – Profit or Loss From Farming
When Passive Activity Rules Kick In
The full business deduction only works if you materially participate. If someone else runs the farming operation or manages the commercial property while you collect income passively, the interest falls under passive activity loss rules. Losses from passive activities, including interest that exceeds income, can only offset other passive income, and disallowed losses carry forward. Rental activities on land are automatically passive regardless of your involvement, with a narrow exception for taxpayers who qualify as real estate professionals under the hours tests in the same statute.10Office of the Law Revision Counsel. 26 U.S. Code 469 – Passive Activity Losses and Credits Limited
Property Taxes on Land
Property taxes on land are deductible whether or not you’ve built anything on it.11Office of the Law Revision Counsel. 26 U.S. Code 164 – Taxes For business land, they’re a business expense with no special cap. For personal or investment land, property taxes fall under the state and local tax (SALT) deduction, which is capped.
For 2026, the SALT cap is $40,400 for most filers and $20,200 for married filing separately. That cap covers your combined state income taxes (or sales taxes) and property taxes on all properties you own. If you already max out SALT through your state income tax and primary home property tax, taxes on a second parcel provide no additional federal benefit. For taxpayers with modified adjusted gross income above $500,000, the cap phases down and can shrink as low as $10,000. Business-use property taxes reported on Schedule C or Schedule F sit outside the SALT cap entirely, which is one of several reasons business classification carries real tax advantages for landowners.
Capitalizing Costs Under Section 266
When you can’t deduct interest or property taxes currently — because the land is personal-use, your investment income is too low, or the SALT cap blocks the property tax deduction — Section 266 offers a fallback. You elect to capitalize those carrying costs, adding them to your cost basis in the land instead of deducting them.12eCFR. 26 CFR 1.266-1 – Taxes and Carrying Charges Chargeable to Capital Account
The election is available specifically for unimproved and unproductive real property, and it covers annual property taxes, mortgage interest, and other carrying charges.12eCFR. 26 CFR 1.266-1 – Taxes and Carrying Charges Chargeable to Capital Account The mechanics are simple: you don’t deduct the expenses, and you increase your basis by the same amount. A higher basis means less taxable gain when you sell.
A few details matter. The election must be made annually. You file a statement with your original tax return each year, listing the property and the specific expenses you’re capitalizing.12eCFR. 26 CFR 1.266-1 – Taxes and Carrying Charges Chargeable to Capital Account You can capitalize in some years and deduct in others when deductions are available. The election is not available for property that produces income during the tax year. For someone holding raw land for several years before selling, this is often the only way to get any tax benefit from the interest and taxes paid during the holding period.
How Capitalizing Plays Out at Sale
Every dollar you capitalize under Section 266 lifts your cost basis, which directly cuts the taxable gain when you sell. Bought land for $200,000, paid $30,000 in interest and $8,000 in property taxes over several years, capitalized all of it: your adjusted basis at sale is $238,000. A sale at $350,000 produces a $112,000 gain instead of a $150,000 gain.13Internal Revenue Service. Publication 551 – Basis of Assets
For investment land held longer than one year, that gain qualifies for long-term capital gains rates, which run lower than ordinary income rates for most taxpayers. Capitalizing costs during the holding period and paying capital gains rates at sale often produces a better tax outcome than deducting interest annually against ordinary income, especially for taxpayers in lower brackets during the holding years who expect to sell in a year when their income is also modest. Run the comparison both ways before locking in your approach for the year.