Tax Planning for Home Purchases

Why Home Purchase Tax Planning Matters

Buying a home is one of the largest financial decisions you’ll make. Beyond the mortgage, down payment, and ongoing costs, there are significant tax implications that many first-time homebuyers overlook. Understanding the deductions available to you — mortgage interest, property taxes, points — can help you plan your finances more effectively and may substantially change your tax picture.

For many homebuyers, especially those who previously took the standard deduction, the act of buying a home triggers a shift to itemizing deductions on Schedule A. This change can meaningfully reduce your overall tax liability.

The Mortgage Interest Deduction

When you take out a mortgage, the interest you pay is tax-deductible — but with limits.

You can deduct interest on mortgages up to $750,000 in loan amount. (This limit was reduced from $1 million under the Tax Cuts and Jobs Act.) Importantly, this is the mortgage balance, not the home’s value. If you have a $1.2 million home but only a $700,000 mortgage, you can deduct all the interest when you itemize.

Mortgage interest is fully deductible — it’s not subject to the SALT cap that limits property tax deductions.

Example. You purchase a home with a $750,000 mortgage at 6% interest. In a full year, you’d pay nearly $45,000 in interest (though this decreases slightly each year as principal is paid down). All of that interest is deductible if you itemize.

Only taxpayers who itemize deductions on Schedule A can claim the mortgage interest deduction. If your total itemized deductions don’t exceed the standard deduction, you’ll take the standard deduction instead, and the mortgage interest benefit is lost.

Property Taxes and the SALT Cap

Property taxes on your home are deductible on Schedule A — but they’re subject to the SALT cap (State and Local Taxes).

For 2025, the SALT cap is $40,000 for married filing jointly ($20,000 for single filers). This cap applies to the combined total of state income taxes, local income taxes, and property taxes.

Example. A married couple pays $20,000 in property taxes and $25,000 in state income tax. Together, that’s $45,000 in SALT. But only $40,000 is deductible; the remaining $5,000 is lost.

For high earners in expensive homes in high-tax states (California, New York, New Jersey, etc.), the SALT cap is a real constraint. You may not be able to deduct all your property taxes, even though they’re otherwise deductible. The SALT add-back is also one of the most common triggers for the Alternative Minimum Tax (AMT).

Points and Prepaid Interest

When you close on a home, you may pay “points” — prepaid interest designed to lower your mortgage rate. One point typically equals 1% of the loan amount.

Points paid for the purchase of your principal residence are fully deductible in the year paid. This can be a meaningful deduction in the closing year.

Points paid for a refinance are treated differently: you must amortize (spread) them over the life of the new loan rather than deducting them all at once.

Home Equity Line of Credit (HELOC) Interest

HELOC interest is deductible — but only under specific conditions.

HELOC interest is deductible only if the borrowed funds are used to buy, build, or substantially improve your home. If you use a HELOC to pay off credit card debt, fund a vacation, or cover other expenses unrelated to the home, that interest is not deductible.

This is a common misunderstanding. Many people assume all HELOC interest is deductible, but the IRS requires you to track how the borrowed funds are actually used. If you can’t document that the proceeds were used for qualifying home-related purposes, the interest deduction is denied.

The First-Year Adjustment: Partial-Year Deductions

Most home purchases don’t happen on January 1st. If you close in June, you’re only paying mortgage interest and property taxes for about half of the year.

Example. You close on a home on July 1 with a $750,000 mortgage at 6%. In a full year, you’d pay nearly $45,000 in interest. But since you own the home for only six months, your first-year interest deduction will only be half of that. You will likely also only pay half of the annual property taxes. In total, your deductible housing costs will be far less than in a full year.

This matters because it affects whether you’ll actually exceed the standard deduction and trigger itemization in year one. Many first-time homebuyers expect to itemize immediately but find they don’t quite cross the threshold in year one because of the partial-year effect.

The offset: points paid at closing are fully deductible in year one (not in subsequent years), which helps narrow the gap. But depending on how many points you pay, it may not fully make up the shortfall.

The key takeaway: don’t be surprised if your tax savings from the home purchase are smaller in year one than you expected. In year two and beyond, with a full year of deductions, the benefit becomes clearer.

The Itemization Flip: When Home Purchase Changes Your Tax Profile

Before buying a home, many people take the standard deduction (simpler, often sufficient given their income and deductions).

After buying, mortgage interest, property taxes, and points may collectively push your total itemized deductions above the standard deduction. When that happens, you switch from taking the standard deduction to itemizing on Schedule A.

This shift can meaningfully change your tax profile.

Example. A single filer earns $150,000 and has minimal deductions. Their standard deduction for 2026 is $16,100. Without a home, they take the standard deduction and owe roughly $24,000 in federal income tax.

After buying a home, they may have $30,000 in mortgage interest and $12,000 in property taxes = $42,000 in itemized deductions. Now they itemize instead of taking the standard deduction. Their taxable income drops from $150,000 to $108,000, and their federal tax liability drops to roughly $17,000 — a savings of approximately $7,000.

Coordination with Other Deductions and Strategies

Once you begin itemizing due to a home purchase, other deductions become relevant and valuable:

• Charitable giving. If you weren’t itemizing before, charitable donations (above 0.5% of your AGI) now reduce your taxable income. This pairs naturally with donor-advised fund strategy — bundling charitable giving in high-itemization years maximizes the tax benefit. Donating appreciated stock instead of cash can amplify the value further.
• Medical and dental expenses. Once you’re itemizing, qualifying medical expenses (above 7.5% of your AGI) become deductible.
• Other state and local taxes. Sales tax (if you elect this instead of state & local income tax) counts toward your SALT deduction.

Understanding that you’re now in “itemization territory” may prompt you to reconsider other tax strategies.

The Takeaway

Home purchase creates multiple tax deduction opportunities: mortgage interest, property taxes, and points. For many first-time homebuyers, these deductions trigger a shift from standard to itemized deductions on Schedule A, which can meaningfully reduce tax liability. However, expect year-one deductions to be lower due to partial-year ownership; the full benefit materializes in subsequent years. HELOC interest is deductible only if borrowed funds are used for home purchase or improvement — not for other purposes. Understanding these tax implications helps with financial planning and may change your overall tax strategy.