Most homeowners know they can write off mortgage interest. That single line item, however, barely scratches the surface of what the tax code allows. The IRS publishes a web of guidance across multiple publications that, taken together, outlines at least eight additional breaks. Interestingly, many filers either misunderstand or skip them entirely causing them to miss out on homeowner tax deductions.
With property values climbing and more workers splitting their homes between personal and business use, the gap between what homeowners claim as homeowner tax deductions and what they qualify for has likely widened.
Real Estate Taxes vs. Nondeductible Assessments
Property tax bills often bundle several charges into one payment, and that bundling trips up filers. State and local real estate taxes are deductible as an itemized expense. On the other hand, special assessments for local benefits such as sidewalks, sewer lines, or street improvements generally are not. The IRS draws a clear line between the two in its homeowner guidance, yet many taxpayers either deduct the full bill or skip the deduction altogether out of confusion.
A Government Accountability Office report titled “Real Estate Tax Deduction: Taxpayers Face Challenges in Determining What Qualifies” found that filers routinely struggle to separate deductible taxes from nondeductible charges on their statements. The GAO recommended clearer disclosures so property owners can more easily identify qualifying amounts. That report is over a decade old, but the confusion it documented has not disappeared. Homeowners who take the time to parse their tax bills line by line may find they are entitled to a deduction they assumed was off limits, or that they have been overclaiming charges that do not qualify.
Points Paid on a Mortgage
Points, sometimes called loan origination fees, are prepaid interest charged at closing. When the proceeds of the loan are used to buy, build, or substantially improve a primary residence, those points can often be deducted in the year they are paid. But the rules carry restrictions. If the loan proceeds go toward something other than acquiring or improving the home, the deduction must be spread over the life of the loan instead. The IRS spells out this allocation and timing requirements in its mortgage interest guide. The guide also covers late payment charges and mortgage prepayment penalties. It regards them as potentially deductible items that sit adjacent to interest itself.
A related wrinkle catches refinancers off guard. When a homeowner refinances and has not yet deducted all the points from the original loan, the remaining unamortized balance can be written off in the year the old loan is paid off. The Schedule A instructions detail this rule. Despite that, it is one of the most commonly missed line items on itemized returns. That said, reviewing closing disclosures for both the original and refinanced loans can help identify any remaining points that should be deducted.
Personal Property Taxes Based on Value
Beyond real estate, some states and localities impose annual taxes on personal property such as vehicles, boats, or equipment. These are deductible as long as two conditions are met: the tax must be based on the item’s value, and it must be levied on a yearly basis. A flat registration fee does not count. The IRS explains these requirements in the itemized deduction instructions. That’s why homeowners who also own cars or recreational vehicles in states with ad valorem taxes should check whether they are leaving money on the table.
Because these charges often appear on state registration or renewal notices rather than a property tax bill, they are easy to overlook. Taxpayers who itemize may benefit from gathering all such statements for the year. Also, highlighting any line that is explicitly tied to the value of the asset and assessed on a recurring basis can be helpful too.
The Mortgage Interest Credit for MCC Holders
One of the least-used homeowner tax benefits is not a deduction at all. It is a credit. Taxpayers who receive a Mortgage Credit Certificate from a state or local housing program can claim the mortgage interest credit on Form 8396. Because credits reduce tax liability dollar for dollar rather than simply lowering taxable income, this benefit can be more valuable than an equivalent deduction. The credit is calculated as a percentage of the mortgage interest paid. Note that it is still subject to program limits and federal caps.
Many qualifying buyers never file for it because they do not realize the certificate they received at closing unlocks a benefit. That certificate unlocks a federal tax benefit separate from the standard interest deduction. Reviewing closing packages for any reference to a Mortgage Credit Certificate and retaining the annual interest statement from the lender are key steps to capturing this credit.
Capital Improvements That Reduce Future Gain
Not every tax benefit shows up on a current-year return. Homeowners who add a deck, replace a roof, or install a new HVAC system are making capital improvements that increase the home’s cost basis. When the property eventually sells, a higher basis means a smaller taxable gain. The IRS distinguishes improvements from repairs: a repair maintains the home in its current condition, while an improvement adds value, prolongs its life, or adapts it to a new use. The rules for what qualifies appear in the agency’s home sale publication.
Also, closing costs such as title insurance and recording fees can also be added to basis according to IRS guidance on asset basis. Points paid to obtain a loan, however, do not increase basis. That’s because they are treated as deductible interest instead. Maintaining a running file of receipts, contracts, and settlement statements can make it far easier to reconstruct basis when it is time to sell.
Home Office Expenses for the Self-Employed
Remote work surged in recent years. But the home office deduction remains limited to taxpayers who are self-employed or independent contractors. W-2 employees generally cannot claim it under current law. For those who do qualify, the IRS offers two paths. The simplified method allows a flat per-square-foot rate.
The actual expense method lets filers allocate a share of utilities, insurance, repairs, and depreciation based on the percentage of the home used exclusively for business. The agency’s home office guide walks through both calculations. Self-employed homeowners who default to the simplified method without running the numbers on actual expenses may be leaving a larger deduction unclaimed. On the other hand, the recordkeeping burden for actual expenses is higher, so weighing the potential tax savings against the time required to track bills and maintain floor plans is essential.
Rental Income Deductions for Mixed-Use Homes
Homeowners who rent out a room, a basement apartment, or a vacation property enter a different tax category. That category unlocks deductions unavailable to purely personal-use owners. Depreciation, maintenance, and a proportional share of mortgage interest and property taxes can all be written off against rental income. The IRS explains these rules in its residential rental guidance. The rules cover how to divide expenses between personal and rental use when a property serves both purposes.
The allocation typically depends on the number of days the property is rented at fair market value versus used personally. Allocation can also depend on the square footage devoted to tenants. Misclassifying days of use or failing to claim depreciation are common errors. Because depreciation reduces the property’s basis, it also affects the tax consequences when the home or rental portion is eventually sold, making accurate records critical.
Bringing It All Together at Tax Time
For many homeowners, the biggest challenge to getting homeowner tax deductions is not understanding any single rule in isolation. Rather, it’s about coordinating them across one property that may serve multiple roles over time. A house might start as a primary residence, later include a home office, and then add a short-term rental unit. It may eventually get sold after substantial improvements. Each stage invokes a different slice of the tax code.
Taking a systematic approach can help. Start by separating bills into categories: real estate taxes, personal property taxes, mortgage-related charges, and home improvement costs. Then match each category to the relevant IRS publication or form instructions. Keeping digital copies of tax bills, closing disclosures, contractor invoices, and loan statements in a single folder for each property can make year-end preparation more straightforward. It also does reduce the risk of overlooking valuable deductions or credits.
The complexity of the rules is unlikely to shrink, but the payoff for careful recordkeeping and a close reading of IRS guidance can be significant. For homeowners willing to go beyond the familiar mortgage interest line, the tax code offers a broader toolkit than many realize.
Paul Anderson is a finance writer and editor at The Financial Wire. He has spent seven years writing about investment strategies and the global economy for digital publications across the US and UK. His work focuses on making sense of economic policy, cost-of-living issues, and the stories that affect everyday Americans.
