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The housing market in many parts of the country is strong this spring. If you’re buying or selling a home, you should know how to determine your “basis.”

How it works

You can claim an itemized deduction on your tax return for real estate taxes and home mortgage interest. Most other homeownership costs can’t be deducted currently. However, these costs may increase your home’s “basis” (your cost for tax purposes). And a higher basis can save taxes when you sell.

The law allows an exclusion from income for all or part of the gain realized on the sale of your home. The general exclusion limit is $250,000 ($500,000 for married taxpayers). You may feel the exclusion amount makes keeping track of the basis relatively unimportant. Many homes today sell for less than $500,000. However, that reasoning doesn’t take into account what may happen in the future. If history is any indication, a home that’s owned for 20 or 30 years appreciates greatly. Thus, you want your basis to be as high as possible in order to avoid or reduce the tax that may result when you eventually sell.

Good recordkeeping

To prove the amount of your basis, keep accurate records of your purchase price, closing costs, and other expenses that increase your basis. Save receipts and other records for improvements and additions you make to the home. When you eventually sell, your basis will establish the amount of your gain. Keep the supporting documentation for at least three years after you file your return for the sale year.

Start with the purchase price

The main element in your home’s basis is the purchase price. This includes your down payment and any debt, such as a mortgage. It also includes certain settlement or closing costs. If you had your house built on land you own, your basis is the cost of the land plus certain costs to complete the house.

You add to the cost of your home expenses that you paid in connection with the purchase, including attorney’s fees, abstract fees, owner’s title insurance, recording fees, and transfer taxes. The basis of your home is affected by expenses after a casualty to restore damaged property and depreciation if you used your home for business or rental purposes,

Over time, you may make additions and improvements to your home. Add the cost of these improvements to your basis. Improvements that add to your home’s basis include:

A room addition,
Finishing the basement,
A fence,
Storm windows or doors,
New heating or central air conditioning system,
Flooring,
A new roof, and
Driveway paving.

Home expenses that don’t add much to the value or the property’s life are considered repairs, not improvements. Therefore, you can’t add them to the property’s basis. Repairs include painting, fixing gutters, repairing leaks, and replacing broken windows. However, an entire job is considered an improvement if items that would otherwise be considered repairs are done as part of extensive remodeling.

The cost of appliances purchased for your home generally doesn’t add to your basis unless they are considered attached to the house. Thus, the cost of a built-in oven or range would increase basis. But an appliance that can be easily removed wouldn’t.

Plan for best results

Other rules and requirements may apply. We can help you plan for the best tax results involving your home’s basis.

If you own a home, the interest you pay on your home mortgage may provide a tax break. However, many people believe that any interest paid on their home mortgage loans and home equity loans is deductible. Unfortunately, that’s not true.

First, keep in mind that you must itemize deductions in order to take advantage of the mortgage interest deduction.

Deduction and limits for “acquisition debt”

A personal interest deduction generally isn’t allowed, but one kind of interest that is deductible is interest on mortgage “acquisition debt.” This means debt that’s: 1) secured by your principal home and/or a second home, and 2) incurred in acquiring, constructing or substantially improving the home. You can deduct interest on acquisition debt on up to two qualified residences: your primary home and one vacation home or similar property.

The deduction for acquisition debt comes with a stipulation. From 2018 through 2025, you can’t deduct the interest for acquisition debt greater than $750,000 ($375,000 for married filing separately taxpayers). So if you buy a $2 million house with a $1.5 million mortgage, only the interest you pay on the first $750,000 in debt is deductible. The rest is nondeductible personal interest.

Higher limit before 2018 and after 2025

Beginning in 2026, you’ll be able to deduct the interest for acquisition debt up to $1 million ($500,000 for married filing separately). This was the limit that applied before 2018.

The higher $1 million limit applies to acquisition debt incurred before Dec. 15, 2017, and to debt arising from the refinancing of pre-Dec. 15, 2017 acquisition debt, to the extent the debt resulting from the refinancing doesn’t exceed the original debt amount. Thus, taxpayers can refinance up to $1 million of pre-Dec. 15, 2017 acquisition debt, and that refinanced debt amount won’t be subject to the $750,000 limitation.

The limit on home mortgage debt for which interest is deductible includes both your primary residence and your second home, combined. Some taxpayers believe they can deduct the interest on $750,000 for each mortgage. But if you have a $700,000 mortgage on your primary home and a $500,000 mortgage on your vacation place, the interest on $450,000 of the total debt will be nondeductible personal interest.

“Home equity loan” interest

“Home equity debt,” as specially defined for purposes of the mortgage interest deduction, means debt that: is secured by the taxpayer’s home, and isn’t “acquisition indebtedness” (meaning it wasn’t incurred to acquire, construct or substantially improve the home). From 2018 through 2025, there’s no deduction for home equity debt interest. Note that interest may be deductible on a “home equity loan,” or a “home equity line of credit,” if that loan fits the tax law’s definition of “acquisition debt” because the proceeds are used to substantially improve or construct the home.

Home equity interest after 2025

Beginning with 2026, home equity debt up to certain limits will be deductible (as it was before 2018). The interest on a home equity loan will generally be deductible regardless of how you use the loan proceeds.

Thus, taxpayers considering taking out a home equity loan— one that’s not incurred to acquire, construct or substantially improve the home — should be aware that interest on the loan won’t be deductible. Further, taxpayers with outstanding home equity debt (again, meaning debt that’s not incurred to acquire, construct or substantially improve the home) will currently lose the interest deduction for interest on that debt.

Home sales: How to determine your “basis”