Harris County homeowners face more annual deadlines than almost any other county in the country, and the consequences of missing them range from a penalty charge to losing a tax exemption worth thousands of dollars a year. This 2026 Harris County homeowner's calendar lays out every deadline that matters, month by month, with exactly what happens if you miss each one.
The year runs on two parallel tracks: the property tax cycle managed by the Harris Central Appraisal District (HCAD) and the Harris County Tax Office, and the annual drumbeat of hurricane and flood preparedness that every Houston-area homeowner has to take seriously. Layered on top for 2026: draft FEMA flood maps released in February that could eventually reclassify your property's flood risk. Knowing when to act and when to simply monitor is the difference between staying ahead and scrambling to catch up.
January: The First Big Deadline
January 31 — 2025 property taxes due. The 2025 property taxes are due January 31, 2026. Taxes become delinquent on February 1, and penalty and interest begin immediately. Additional collection fees of 15% to 20% can be added later if taxes remain unpaid and are sent to a delinquent tax law firm. That escalation is not a distant threat, and it typically arrives within months.
Harris County residents can pay their property taxes, set up automated payment plans, and set bill reminders via the county's online property tax payment system at MyHarrisCountyTax.com, the official Harris County Tax Office payment portal. The platform supports bill reminders, partial payments, scheduled payments, and multi-account management. A prepayment plan option allows homeowners to make monthly automatic prepayments toward their tax bill throughout the year, spreading out what would otherwise be a lump-sum obligation. If you haven't set up an account yet, January is the time to do it, not February 1.
One option worth knowing: under Texas Tax Code § 31.03, property owners who pay one-half of the property tax before December 1 may pay the remaining one-half before July 1 of the following year without being subject to late fees or interest. If you used the half-payment option for your 2025 taxes, your second half is due by June 30, 2026. Miss that and the split loses its penalty-free status.
January is also the right time to log in to hcad.org and confirm your homestead exemption is still active on your account. If the information on the annual postcard is correct, your exemption will automatically renew. If you do not receive a postcard by mid-January, check your online HCAD account to confirm your homestead exemption is in place. Many homeowners discover a lapsed exemption only when their spring notice arrives with a dramatically higher taxable value.
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February 2026 delivered the most consequential flood mapping news Harris County has seen in nearly two decades. On February 10, 2026, FEMA posted a draft of Harris County's new flood maps online, the first comprehensive update since 2007. Residents can review the updated flood maps and search their address using the Harris County Flood Control District's online flood map viewer at hcfcd.org/MAAPnext. Look up your address before the formal comment process opens.
The scale of the proposed changes is significant. The 100-year floodplain (Special Flood Hazard Area) is projected to expand by approximately 50,000 acres, increasing from 150,000 to 200,000 acres, a 33% increase in high-risk designation areas. This reclassification would move over 170,000 properties and $50 billion in real estate assets into the high-risk designation, requiring flood insurance for homeowners with federally backed mortgages. Homeowners in Meyerland, Kingwood, Atascocita, and along Buffalo and Brays Bayous should check their address on the MAAPnext viewer without delay.
The draft MAAPnext flood maps are currently in draft form and are being shared for informational and educational purposes only. Draft maps are provided for awareness only and are not open for formal comments or appeals. These draft maps are not final, cannot be used for insurance or regulatory decisions, and are not open for public comment at this time. The process has officially started, and the last time this happened, after Tropical Storm Allison, it took about three years from draft to enforcement. That means the window to formally challenge a proposed designation will open once FEMA moves the maps to preliminary status, and homeowners near newly proposed floodplain boundaries should begin gathering documentation now. The new maps were developed through FEMA's MAAPnext initiative, a joint effort with the Harris County Flood Control District that remodeled all 22 of the county's watersheds from scratch. The maps reflect changing conditions in Harris County, including a more than 30% increase in rainfall rates, updated topography, and advanced modeling. If your property sits near a newly proposed floodplain boundary, consult a certified floodplain manager about whether an elevation certificate or Letter of Map Amendment (LOMA) applies to your situation.
March is also the time to begin building your property protest file. Harris County appraisal notices are expected to go out late March into early April, according to HCAD. Start pulling comparable sales from HCAD's property search tool, take photos of any deferred maintenance or structural issues, and gather any contractor repair estimates. The homeowner who walks into protest season prepared beats the one who scrambles after the notice arrives.
April: Your Exemption Window
April 30 — homestead exemption application deadline. You should file your regular residential homestead exemption application between January 1 and April 30. Early applications will not be accepted. If your application is postmarked by April 30, this will allow the district time to process it before your tax statement comes out in the fall. Applications are filed directly with HCAD at hcad.org or via the HCAD Mobile App. You'll need a valid Texas driver's license matching your homestead address.
The homestead exemption is one of the most financially powerful tools a Harris County homeowner has. In November 2025, Texas voters overwhelmingly approved Proposition 13, raising the school district homestead exemption from $100,000 to $140,000. Harris County also currently provides a 20% optional homestead exemption to all homeowners on top of that school district amount. An additional benefit of the general homestead exemption, especially in an appreciating housing market, is the homestead cap, or limitation on increases in appraised value. The cap applies to your homestead beginning in the second year you have a homestead exemption. The cap law provides that the value on which your taxes will be calculated cannot exceed last year's appraised value, plus 10%, plus the value added by any new improvements made during the preceding year. On a home in a rising market, that cap can shelter tens of thousands of dollars of assessed value from the tax rolls year after year.
Also in April: your HCAD Notice of Appraised Value arrives. The notice includes your account number and iFile number — you need these to protest online. The appraisal notice is not a tax bill. You have to protest that value if you want it reduced. When the notice arrives, check the property details line by line: square footage, year built, bedroom and bath count, and any listed improvements. Errors in your favor are rare; errors against you are not.
The Harris County Flood Control District recommends homeowners review their flood insurance by April 1 ahead of hurricane season. With the new MAAPnext draft maps now publicly viewable, this review carries more weight in 2026 than in prior years. Insurance companies frequently halt policy changes once a named storm is being tracked in the Gulf, so April is the last reliable window to make adjustments before the season officially opens.
May 15: The Most Valuable Date on the Calendar
The protest deadline is May 15, 2026, unless it falls on a weekend or holiday, in which case the deadline would be the next business day. You can file until May 15, or 30 days after the date your notice of appraised value was mailed, whichever is the later date. The 30-day rule matters: if HCAD mails your notice late, your protest window extends accordingly.
HCAD Chief Appraiser Roland Altinger has confirmed that in recent years the district has settled more than 500,000 protests on an annual basis. The proportion of formal protests that led to a reduction in single-family homes was 71% in 2024. The process is free, fully online, and available to every Harris County homeowner regardless of whether they work with a third-party firm.
Filing is done through HCAD's Electronic Filing and Notice System at owners.hcad.org. Harris County residents can file protests online via i-File at hcad.org. There are two programs — iFile and iSettle — that the appraisal district has in place to help streamline any appeal you choose to make. iFile is how you formally file the protest; iSettle is the negotiation step, where HCAD's appraiser reviews your evidence and may extend a settlement offer without you ever attending a hearing.
If an iSettle offer is made, you will have immediate online access to all of the information including the comparable sales HCAD used in considering your appeal. You can then use that information to decide whether to accept or reject HCAD's decision. If you are not satisfied, you'll be scheduled to make your case at a formal Appraisal Review Board hearing. The ARB is an independent three-member panel and is not a HCAD employee deciding your case.
One practical warning: HCAD's system sees enormous volume near the deadline. File early. A server error at 11:58 PM on May 15 is not a valid excuse for a late filing, and HCAD will not extend the deadline for technical difficulties you didn't document in advance. File in the first two weeks of May at the latest — ideally the same week your notice arrives.
| Deadline | Action Required | Consequence If Missed |
|---|---|---|
| January 31 | Pay 2025 property taxes | Penalties + interest begin Feb 1; potential 15–20% collection fee |
| April 1 | Review flood insurance before hurricane season | Carriers may restrict new policies once a storm enters the Gulf |
| April 30 | File homestead exemption at HCAD.org | Miss the year's cycle; late file allowed up to 2 years |
| May 15 | File property value protest via iFile | No appeal rights for the year; overpayment is permanent |
| June 30 | Second half-payment (if using split option) | Split plan loses penalty-free status; full penalties apply |
| November 30 | First half-payment to qualify for split-payment plan | Must pay full amount by January 31 instead |
June–July: Hurricane Season Starts
The 2026 Atlantic hurricane season is the upcoming Atlantic hurricane season event in the Northern Hemisphere. The season will officially begin on June 1, 2026, and end on November 30, 2026. For Harris County homeowners, that means the pre-season window — roughly April through May — is when insurance decisions need to be made, not after a named storm is in the Gulf. Insurance companies frequently halt policy changes, increases in coverage, and new applications once a storm is being tracked. By the time you think you need better flood coverage, it may already be too late to buy it.
As for what the season may bring: a major transition in global climate patterns is now ongoing, with the tropical Pacific shifting from a weakening La Niña and potentially heading toward an El Niño later in 2026. During El Niño years, the Atlantic produces on average roughly 10 named storms and five hurricanes. By contrast, La Niña years tend to be far more active, generating an average of 14 storms and seven hurricanes. Even with El Niño potentially working against tropical storm development, forecasters are urging the public not to treat a quieter season forecast as a reason for complacency. Warmer-than-average Atlantic sea surface temperatures are expected to persist heading into hurricane season, providing the fuel that storms need to intensify once they do form. Harris County has learned from Harvey that it takes only one storm to cause catastrophic losses.
June is the time to review both your homeowners and flood insurance policies side by side. The new MAAPnext preliminary maps make this more urgent than usual. Even if your property is not currently in a mapped high-risk zone, check the draft boundaries. Hurricane Harvey proved it: roughly 70% of flooded homes sat outside the officially mapped high-risk zone. Private flood insurance options have expanded significantly in recent years and are often more competitively priced than National Flood Insurance Program (NFIP) policies for properties outside the AE zone.
Alongside insurance, June is the right time to physically prep your property. Walk your roof and document its condition with dated photos — these become protest evidence next spring if you need them. Clear gutters and downspouts. If your neighborhood sits near Brays Bayou, White Oak Bayou, or Greens Bayou, check your nearest Harris County Flood Control detention basin for any posted maintenance notices. July brings the first statistical peak of the season; anything still on your prep list in August is genuinely risky to defer.
August–September: Peak Season, ARB Hearings
August and September are peak months for Atlantic hurricane activity — statistically, the most dangerous stretch of the season for Gulf Coast homeowners. Keep your home inventory documentation current and stored off-site or in cloud backup. A video walkthrough of every room, showing serial numbers on appliances, is worth more than any written list in a post-storm insurance claim.
On the property tax front, August is when ARB hearings for homeowners who rejected their iSettle offers are typically scheduled. Most protests are resolved by the end of July, but your ARB appointment may be scheduled anywhere from three weeks to three months after the iSettle process concludes. Come to an ARB hearing with four printed copies of your evidence — the board requires paper, not digital files. Comparable sales from HCAD's own property search tool, printouts of similar homes that sold below your assessed value, and photos of any condition issues are your strongest arguments.
After the ARB, your remaining options are binding arbitration or litigation in district court. Those make sense mainly for higher-value homes and commercial properties. For a typical Harris County home in the $300,000 to $400,000 range, the economics of arbitration work only when the potential tax savings over several years clearly outweigh the filing fee and any legal costs. An address-specific valuation from HarrisCountyHomeValue.com can give you a current market estimate to anchor your decision on whether the gap between HCAD's certified value and actual market value is large enough to pursue further appeal.
October–November: Tax Bills Arrive
Property tax bills typically start arriving in late October and throughout November. The moment yours arrives, open it and check for errors. Confirm that your homestead exemption is reflected. Confirm the taxable value matches what was settled in your protest — or the certified value if you did not protest. Errors at this stage can be corrected, but only if you catch them before the January 31 deadline passes.
November 30 — first half-payment deadline. November 30 is the initial half-payment deadline, and January 31, 2026, is the final day for settling tax dues without added charges. For the 2026 tax year, that half-payment deadline falls November 30, 2026. To use the split-payment option, you must pay the first half by that date. Pay the second half by June 30, 2027, and you owe no penalty or interest on either installment. It is a legitimate cash-flow management tool, especially useful for homeowners paying out of pocket rather than through an escrow account.
October and November are also among the best months of the year to shop homeowners insurance. Renewals typically land in this window, and unlike the May through September period when some carriers restrict policy changes during active hurricane season, fall is when the market is fully open. Get at least two competing quotes. If your home is in or near a newly proposed flood zone under the MAAPnext draft maps, use this window to explore private flood insurance options before mandatory flood insurance requirements potentially kick in when the maps are finalized. The full update could take two to three years before the maps become final and enforceable.
December: Set Up a Clean Slate
December is the planning month. No hard deadlines, but several actions here prevent scrambling in January. If you have not yet paid your 2025 taxes and do not plan to use the half-payment option, set up your payment now at MyHarrisCountyTax.com. The portal's prepayment plan option allows homeowners to make monthly automatic prepayments toward their property taxes throughout the year, easing the financial burden of a single lump-sum bill. Setting up that plan in December 2026 for your 2026 taxes avoids the January crunch entirely.
If you are planning any significant home improvements — an addition, a pool, a detached garage — the HCAD assessment date for any given tax year is January 1. Work completed and permitted before January 1 will be visible to HCAD's appraisers for the upcoming year's valuation. Work permitted after January 1 generally falls into the next assessment cycle. Big improvements such as additions, pools, and extensive remodels are new value and aren't protected by the cap. Consider timing upgrades after the cap is in place. Timing major projects strategically can defer a portion of the resulting tax increase by twelve months.
Finally, log in to hcad.org and review your property record for any errors that have accumulated during the year — incorrect square footage, inaccurate improvements listed, wrong year built. Errors caught and corrected in December are fixed before the appraisal cycle restarts in January. Errors discovered in April are rushed.
The Recurring Watch List
A handful of obligations don't fit neatly into one calendar month but can surface at any time and demand a quick response.
Five-year homestead exemption verification. Since 2023, appraisal districts must verify homestead eligibility at least once every five years. If you ignore verification mailers, your exemption can be removed. The first five-year review cycle is already underway. If a taxpayer does not respond, the appraisal district moves forward with removing the homestead exemption. Watch for a verification mailer from HCAD and respond immediately. A removed exemption can add thousands of dollars to your annual tax bill and trigger an escrow shortfall that hits your mortgage payment the following year.
Late exemption applications. If you missed the April 30 deadline, do not assume all is lost. You can still apply late and claim retroactive exemptions for up to two years. File the late application as soon as you discover the gap. The savings are retroactive to the year you qualified.
Post-ARB options if you lost your protest. If you are still unhappy after the ARB, your next options are binding arbitration or litigation in district court. Binding arbitration requires filing a request and a deposit within 60 days of the ARB order. The deposit is refunded if you prevail. For most owner-occupied homes, arbitration is the more practical path than district court litigation.
New construction and mid-year purchases. The January 1 owner is sent the notice of appraised value. If it is early in the year, the ownership can be changed and the new owner receives the notice. However, if it is later in the year, the January 1 owner or a taxing agent may have already filed a protest for the year on the account. If you close on a home in Harris County mid-year, check HCAD's portal immediately to understand where the account stands in the protest cycle and file your homestead exemption application without delay. Be aware: the homestead cap resets when ownership changes, so property taxes may increase in year two. Keep your HCAD address current, especially if you also maintain a PO Box or split time between properties.
The bottom line for 2026 is straightforward: Harris County rewards homeowners who show up on time with the right paperwork. The protest system is free, the exemption applications are online, and the tax payment portal is better than it has ever been. None of these deadlines require a lawyer or a property tax firm — they require a calendar and about thirty minutes of attention at the right time of year. Mark May 15, April 30, and January 31. Everything else flows from those three dates.