Harris County Property Taxes Went Up. How Much Can You Deduct in 2026?

Harris County Commissioners Court approved a combined 2026 rate of $0.6715 per $100 of value for the county, flood control district, Port of Houston and hospital district, up from $0.6241, which budget officials said adds about $188 a year for a home appraised at $400,000 (ABC13). Harris County bills are typically mailed in October and are due by January 31 (Ownwell), so statements are landing now. So the question I'm getting from Houston clients is a fair one: how much of this bill can I actually deduct?

The short answer for 2026: up to $40,400 of combined state and local taxes if you itemize, less if your income is above $505,000, and the timing of your payment decides which year gets the deduction. Here is how the pieces fit together.

This is general education, not advice for your specific situation.

What is the SALT deduction cap for 2026?

The state and local tax (SALT) deduction covers property taxes plus either state income taxes or state sales taxes. For 2026 the combined limit is $40,400, or $20,200 if you're married filing separately (IRS). That's up from $10,000, where it sat from 2018 through 2024, and from $40,000 in 2025.

The 2025 tax law (the One Big Beautiful Bill Act) raises the cap by 1% a year through 2029 and then drops it back to $10,000 in 2030 (Congress.gov). So the window for a large property tax deduction is four tax years, 2026 through 2029, unless Congress changes course.

Two things are easy to miss:

• It only matters if you itemize. The 2026 standard deduction is $32,200 for married couples filing jointly, $16,100 for single filers and $24,150 for heads of household (IRS). Your deductions have to add up to more than that before the SALT deduction is worth anything.
• The cap is per return, not per house. A primary home and a Galveston beach house share the same $40,400.

Why does the cap matter more in Texas?

In a state with an income tax, the cap fills up fast with income tax alone. Texas has none, so for Houston families the SALT deduction is property tax plus sales tax. You elect to deduct state and local general sales tax instead of income tax by checking box 5a on Schedule A, using either your actual receipts or the IRS optional sales tax tables, which estimate sales tax from income and family size and let you add the tax on big-ticket items like a vehicle or boat (IRS Topic 503).

Not everything on your Harris County statement counts. Deductible real property taxes are taxes levied for the general public welfare at a uniform rate; charges for specific services, like a periodic trash collection fee or a per-unit water charge, aren't deductible even when the taxing authority collects them (IRS Publication 530). Homeowners association dues aren't deductible either (IRS Topic 503).

How does the phase-down work above $505,000?

This is the part that catches high earners. For 2026, the $40,400 cap is reduced by 30% of the amount your modified adjusted gross income exceeds $505,000 ($252,500 if married filing separately), but not below $10,000 (Congress.gov). The cap hits the $10,000 floor at about $606,333 of MAGI (Congressional Research Service).

Two practical points:

• The phase-down only costs you to the extent your actual SALT exceeds the reduced cap. If your property tax plus sales tax total $22,000, nothing changes until the cap falls below $22,000, which happens at roughly $566,000 of MAGI. If your total is $40,400 or more, every dollar over $505,000 takes 30 cents of deduction with it.
• Inside the window, your effective marginal rate jumps. Losing 30 cents of deduction per dollar of income, at the 35% bracket most of this range falls into for joint filers (the 35% bracket starts at $512,450 and the 37% bracket at $768,700 for 2026, per the IRS), adds roughly 10.5 percentage points. A dollar of income between $505,000 and $606,333 can effectively be taxed at about 45% for a family whose SALT is at the cap.

That makes income timing a property-tax question. A year-end bonus, a Roth conversion, exercising options, or the year you sell a business can push MAGI into the phase-down range. If that income can land in a different year, the SALT deduction is one more reason to run the numbers before December 31. The other year-end levers are in the 2026 year-end tax planning checklist.

Should I pay my Harris County bill in December or January?

Texas gives you a choice most states don't. In most cases you have until January 31 to pay, and taxes unpaid on February 1 are delinquent (Texas Comptroller); Harris County requires mailed payments to be postmarked by the last business day in January (Harris County Tax Office). Because the 2026 bill arrives in October but isn't delinquent until February 2027, you decide which tax year it belongs to:

• Pay by December 31, 2026: the deduction goes on your 2026 return.
• Pay in January 2027: the deduction goes on your 2027 return.

Which is better depends on where the deduction is worth more:

One caution if your lender escrows your taxes: you deduct only the property tax the lender actually paid to the county during the year, not what you deposited into escrow (IRS Publication 530). If you want control over the payment year, you need to pay the county directly or ask your servicer when it remits.

Can I bunch two years of property tax into one year?

Yes, within limits, and it's the most useful trick the Texas payment calendar gives you. Prepaying is not the way to do it. The IRS only allows a deduction for real property taxes that have been assessed and paid; a prepayment of taxes that haven't been assessed yet isn't deductible (IRS). You can't write Harris County a check for 2027 taxes in December 2026 and deduct it.

What does work is shifting an already-assessed bill. Pay the 2025 bill in January 2026 and the 2026 bill in December 2026, and both land on your 2026 return. Then pay nothing in 2027, take the standard deduction, and repeat in 2028.

Here's how that looks for a couple with a $15,000 property tax bill and about $4,000 of sales tax under the IRS tables:

Bunching works best when two years of property tax fit under the cap. A couple paying $25,000 a year would hit the $40,400 ceiling on the two property tax bills alone, with $9,600 of the second bill wasted, so for them the gain is smaller. It also pairs well with bunching charitable gifts through a donor-advised fund, which matters more in 2026 because itemizers can now deduct only the portion of gifts above 0.5% of AGI (Congress.gov). I walk through that in the 2026 year-end gifting guide.

One more wrinkle: if you bought or sold a home in 2026, the property tax is split between buyer and seller as of the sale date for federal purposes, regardless of who wrote the check at closing (IRS Publication 530).

What Texas exemptions should be on my bill before I worry about deductions?

Lowering the bill beats deducting it. Confirm these first:

• General homestead exemption. School districts must exempt $140,000 of your homestead's value, and any taxing unit can adopt a local-option exemption of up to 20% of appraised value (Texas Comptroller).
• Age 65 or disabled exemption. School districts must provide an additional $60,000 exemption for homeowners who are 65 or older or disabled (Texas Comptroller).
• Installment payments at 65+. Homeowners who are 65 or older or disabled can pay homestead taxes in four equal installments without penalty: the first before February 1, then before April 1, June 1 and August 1 (Texas Comptroller). Note that this spreads the payments, and the deduction, across the following calendar year.
• Rental and business property. Property tax on a rental or business property is deducted as an expense of that activity, not on Schedule A (IRS Publication 527), so it doesn't count against the $40,400 cap.

A worked example for a Houston couple

Say a married couple has $450,000 of MAGI, a $22,000 property tax bill, $4,500 of sales tax under the IRS tables, $26,000 of mortgage interest on a loan under the $750,000 limit, and $15,000 of charitable gifts.

• SALT: $22,000 + $4,500 = $26,500, under the $40,400 cap and under the $505,000 phase-down threshold, so fully deductible.
• Mortgage interest: $26,000. The $750,000 acquisition debt limit is now permanent (Congress.gov).
• Charitable: $15,000 less the 0.5% floor ($2,250) = $12,750.
• Itemized total: $65,250, versus a $32,200 standard deduction. Itemizing wins, and paying the property tax in December 2026 locks the deduction into this year.

Now give the same couple a $130,000 bonus that lifts MAGI to $580,000. Their SALT cap falls to $17,900, so $8,600 of the $26,500 they paid is no longer deductible. If part of that bonus could be deferred to 2027, or a planned Roth conversion moved to a lower-income year, the deduction survives intact.

How we help

The right answer comes from your own projection of 2026 and 2027 income, not a rule of thumb. At Mercer Street we work on an hourly, fee-only basis, so a year-end review that settles the December-or-January question and the income-timing decisions around it is a limited-scope engagement at $600 per hour with a two-hour minimum. Clients who have completed a comprehensive plan pay our best rate of $450 per hour for the same work.

If you'd like to run the numbers before your Harris County bill is due, schedule a call or read more about how we work.