SALT Deduction Cap and Real Estate

The $10,000 annual cap on state and local tax (SALT) deductions, enacted in 2017 and set to expire in 2025, has reshaped tax planning for high-income homeowners and real estate investors. In states with steep property taxes—California, New York, New Jersey, Illinois, Massachusetts—the cap bites hard. A homeowner paying £15,000 a year in property taxes alone now forfeits £5,000 of deductions. For real estate investors owning multiple properties, the crunch is even tighter.

How the cap works

Before 2017, taxpayers could deduct state and local taxes (property taxes, income taxes, and sales taxes) with no federal limit. High-tax states like California and New York were, in effect, subsidised by federal taxpayers in lower-tax states, who absorbed a larger share of federal revenues.

The Tax Cuts and Jobs Act of 2017 introduced a £10,000 annual aggregate limit on SALT deductions. This ceiling applies to married couples filing jointly and to single filers; married couples filing separately face a £5,000 each. The cap covers:

• Property taxes (real estate and personal property).
• State and local income taxes.
• Sales taxes (if claimed instead of income taxes).

The cap is an aggregate; a homeowner cannot claim £12,000 in property tax and £5,000 in state income tax. The total is capped at £10,000.

The real estate pinch

For real estate owners, the cap creates a profound distortion. A homeowner in California paying £20,000 a year in property tax on a modest middle-class home can deduct only £10,000 (less if she also pays state income tax). A homeowner in Texas or Florida, paying little to no property tax, faces no pressure from the cap.

For real estate investors holding multiple properties, the squeeze is worse. A landlord in New Jersey owning three rental properties and paying a combined £18,000 in property taxes can deduct only £10,000 against her rental income. The remaining £8,000 is lost. In prior decades, that £8,000 would have reduced her tax liability; now it is simply forfeited.

Why property taxes are treated differently

Property taxes are particularly cruel under the cap because they are unavoidable. A homeowner cannot opt out: property tax is a condition of owning real estate in nearly every jurisdiction. Income tax, by contrast, can be minimised by moving states (a small percentage do); sales tax can be reduced by altering consumption patterns.

Moreover, property taxes are not deductible at the corporate level for most businesses. A corporation owning real estate property pays property tax and cannot deduct it against corporate income; only individuals who itemize can deduct it. This asymmetry means that owner-occupied homes and small rental properties are at a tax disadvantage relative to real estate investment trusts (REITs) or large-scale portfolio investors.

The interaction with mortgage interest

The SALT cap exacerbates the erosion of the mortgage interest deduction, which has also been limited (to loans of £750,000 or less under current rules). Before 2017, a high-income homeowner might deduct substantial mortgage interest plus property taxes plus state income tax, creating a large overall tax deduction that offset her high earned income. Now, if she is capped at £10,000 of SALT, she has far less to deduct. The combination of the SALT cap and the £750,000 mortgage cap has dramatically reduced the tax benefit of homeownership for high-income earners in high-tax states.

Strategic responses

Real estate investors have developed workarounds:

Electing to pass through the entity. A landlord who owns rental properties in a C corporation cannot deduct property taxes at the personal level. But if she operates as a sole proprietor, partnership, or S corporation, the property taxes may flow through to her personal return and count toward her SALT cap—though she is still capped at £10,000.

Timing acquisitions. Some investors have timed property purchases to avoid bunching large property tax bills in a single year. This works only if property taxes are not yet due; in practice, it is a blunt tool.

Relocating. A small number of high-net-worth individuals have relocated to low-tax states (Florida, Texas, Nevada) to escape high state income taxes, thereby preserving their SALT cap room for property taxes. This is available only to the very wealthy.

Charitable bunching. A few taxpayers have combined SALT deductions with charitable donations in a single year to exceed the standard deduction, then claimed the charitable donation while accepting a standard deduction in other years. This requires advanced planning and a charitable budget.

Impact on real estate values

Economists debate whether the SALT cap has depressed property values in high-tax states. In theory, if the tax benefit of homeownership declines, the willingness to pay for homes should fall. Evidence is mixed: property values in California, New York, and New Jersey have remained strong, partly because the cap is temporary (set to expire in 2025 under current law) and partly because supply constraints dominate demand-side tax effects. However, the cap has certainly reduced the after-tax return on real estate investment in high-tax states, making them less attractive to out-of-state investors.

The sunset issue

The SALT cap is set to expire on December 31, 2025, unless Congress extends it. If it expires, the pre-2017 unlimited deduction returns. This creates planning uncertainty: a homeowner cannot know whether her 2026 property tax will be capped or uncapped. Some wealthy homeowners have prepaid 2026 property taxes in December 2025 (a strategy the IRS has partly disallowed) to lock in current-year deductions before the cap potentially expires.

Real estate professional and dealer treatment

For those classified as real estate professionals, rental losses are not passive and can offset other income, but the SALT cap still applies to their personal return. A dealer in real property (one who is treated as a merchant of property rather than a long-term investor) may benefit from different tax treatment of gains, but her property taxes are still capped at £10,000.

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