Kauai County Property Tax Appeal, Hawaii

Travis Bunn·Updated July 24, 2026

Kauai County encompasses the islands of Kauai, Niihau, Lehua, and Kaula, with Lihue serving as the county seat and administrative center. With a population of approximately 73,360, Kauai is the fourth largest county in Hawaii, and major population centers include Kapaa (the island's largest town with over 10,000 residents), Lihue, Princeville, and Hanapepe. Property tax appeals are particularly important in Kauai County due to the island's high home values and unique assessment challenges related to its remote location and tourism-driven real estate market. While Kauai County has one of the lowest effective property tax rates in the United States at approximately 0.19-0.23%, the median home value of $583,200 to $746,300 means that even small assessment errors can result in significant overpayments, making careful review and timely appeals essential for homeowners seeking fair taxation.

Notable cities: Lihue, Kapaa, Princeville, Hanapepe, Koloa

Median Home

$583,200

Tax Rate

0.19%

Annual Tax

$1,099

Population

73,360

On the typical Kauai County home, valued near $583,200 at the county’s effective tax rate of 0.19%, an over-assessment of even 10% means you are overpaying year after year until you appeal it. Here is how to find out if yours qualifies.

2026 Appeal Deadline: December 31, 2026 (or within 30 days of receiving a corrected assessment notice)

The deadline to file a property tax appeal in Kauai County is December 31 each year for assessments mailed in December. If you file in person, the Real Property Assessment Section must receive your appeal by 4:30 PM on December 31. If filing by mail, your appeal must be postmarked on or before December 31. If you receive a corrected assessment notice, you have 30 days from receipt to file an appeal.

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Island home on green Hawaiian grounds. Kauai County appeal guide.

How Kauai County Assesses Property

100%of market value

Assessed by: Kauai County Real Property Assessment Division

Assessment cycle: annual

Notices typically mailed: December (by December 15)

Kauai County assesses property at 100% of fair market value as of October 1 each year. This means your assessed value equals the full market value determined by the county assessor. For example, if your home's market value is $583,200 (the county median), at Hawaii's 100% assessment ratio your assessed value would be $583,200. After applying the basic home exemption of $220,000, your taxable value would be $363,200, resulting in approximately $941 in annual taxes at the owner-occupied rate of $2.59 per $1,000 of assessed value.

The Appeal Process

Appeals are heard by the Board of Review. After filing, you will receive a written notice of your hearing date before the Board of Review. At the hearing, you will present your evidence (comparable sales, photos, repair estimates) and explain why your assessment is incorrect. The Board will review your case and issue a written decision.

Step 1: Review your assessment notice carefully when it arrives in December. Contact the appraisers at 4444 Rice Street, Suite 454 to discuss any questions before filing an appeal, as many misunderstandings can be resolved informally.

Step 2: Gather supporting evidence for your appeal, including recent comparable sales data, photographs showing property condition, repair estimates for any defects, and your own estimate of the property's market value.

Step 3: Complete Form P-51 (Taxpayer's Notice of Real Property Tax Appeal) available on the county website or at the Real Property Assessment Office. You must state a specific market value and check the appropriate grounds for appeal under Kauai County Code Section 5A-12.1.

Step 4: File your appeal by December 31, 2026 along with the required $75 deposit fee. You can file online at connect.kauai.gov, by mail (postmarked by December 31), or in person by 4:30 PM on December 31. The deposit is refundable if your appeal is successful.

Step 5: Attend your hearing before the Board of Review. You will receive a written notice of your hearing date in advance. Present your evidence and explain why your assessment should be reduced.

Step 6: If you disagree with the Board of Review decision, you have 30 days to file an appeal to the Hawaii Tax Appeal Court (a state-level administrative court).

Step 7: If necessary, decisions from the Hawaii Tax Appeal Court can be further appealed to the Hawaii Intermediate Court of Appeals and Hawaii Supreme Court on legal or constitutional grounds.

Required form: Taxpayer's Notice of Real Property Tax Appeal (Form P-51)

Filing Methods

online:Submit through the new online Real Property Tax Appeal application system at connect.kauai.gov (launched December 2025). Pay the $75 deposit fee online.

mail:Mail completed Form P-51 and $75 deposit to: Real Property Assessment Division, 4444 Rice Street, Suite 454, Lihue, HI 96766. Must be postmarked by December 31.

in-person:Submit appeal and $75 deposit in person at Real Property Assessment Office, 4444 Rice Street, Suite 454, Lihue, HI 96766. Must be received by 4:30 PM on December 31.

Evidence to Bring

Recent comparable sales of similar properties in your areaPhotographs showing property condition, defects, or damageContractor estimates for needed repairsIndependent appraisal or professional opinion of valueDocumentation of assessment errors or incorrect property characteristics

Kauai County Assessor Contact

Kauai County Real Property Assessment Division

Phone: (808) 241-4224

Address: 4444 Rice Street, Suite 454, Lihue, HI 96766

Website: https://www.kauai.gov/Government/Departments-Agencies/Finance/Real-Property-Tax/Assessment

Online Portal: https://connect.kauai.gov

Tax Exemptions in Kauai County

Basic Home Exemption

$220,000

Reduces the taxable assessed value for owner-occupied primary residences

Eligibility: Must occupy property as principal home for more than 270 days per year, file Hawaii state income tax as a Kauai resident, and have ownership recorded at the Bureau of Conveyances by September 30Deadline: December 31 preceding the tax year for first half payment, or June 30 for second half payment

Age 60-69 Home Exemption

$240,000

Enhanced home exemption for homeowners aged 60 to 69

Eligibility: Same requirements as basic home exemption plus proof of age (driver's license, birth certificate, or other government document)Deadline: September 30 preceding the tax year

Age 70+ Home Exemption

$260,000

Maximum home exemption for homeowners aged 70 and older

Eligibility: Same requirements as basic home exemption plus proof of age (driver's license, birth certificate, or other government document). This is the highest home exemption in Hawaii.Deadline: September 30 preceding the tax year

Low-Income Home Exemption

$120,000 additional exemption

Additional exemption that reduces refuse collection fees by 50% for qualifying low-income homeowners

Eligibility: Must qualify for basic home exemption and have gross income of all owner-occupants not exceeding 80% of Kauai median household income (2025 limit was $104,200). Must apply annually.Deadline: Annual application required (contact county for current deadline)

Totally Disabled Veteran Exemption

Full exemption (pay only $150-$300 minimum tax)

Exempts 100% service-disabled veterans from all property taxes on their primary residence except minimum tax

Eligibility: Must have 100% service-connected disability rating from VA due to injuries received on active duty. Also available to unremarried surviving spouses. In Kauai County, veterans with 80% or higher disability rating are eligible for exemption on property with taxable value up to $50,000.Deadline: Contact Real Property Assessment Office

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Frequently Asked Questions

What is the deadline to appeal my property taxes in Kauai County for 2026?

The deadline to file a property tax appeal in Kauai County is December 31, 2026. Assessment notices are mailed by December 15 each year, giving property owners approximately two weeks to review their assessment and file an appeal. If you file in person, the Real Property Assessment Office must receive your appeal by 4:30 PM on December 31. If you file by mail, your appeal must be postmarked on or before December 31, 2026. If you receive a corrected assessment notice after the regular deadline, you have 30 days from receipt to file an appeal.

How do I file a property tax appeal online in Kauai County?

Kauai County launched a new online Real Property Tax Appeal application system in December 2025 at connect.kauai.gov. This platform allows property owners to conveniently submit their appeal application and pay the required $75 deposit fee entirely online. You'll need to complete the digital version of Form P-51 (Taxpayer's Notice of Real Property Tax Appeal), provide your property's tax map key number, state your opinion of the property's market value, select your grounds for appeal under Kauai County Code Section 5A-12.1, and submit supporting documentation electronically. The system was developed in partnership with ElementsXS/LIMS to make the appeal process more accessible for Kauai property owners.

What is the home exemption worth in Kauai County for 2026?

Kauai County offers age-tiered home exemptions that are among the most generous in Hawaii. The basic home exemption is $220,000 off your property's assessed value for all qualifying owner-occupants. If you are age 60 to 69, the exemption increases to $240,000. If you are age 70 or older, the exemption reaches $260,000, the highest home exemption in the entire state of Hawaii. For example, on a home assessed at $583,200, the age 70+ exemption of $260,000 would reduce your taxable value to $323,200, saving you approximately $673 in annual property taxes at the owner-occupied rate of $2.59 per $1,000. To qualify, you must occupy the property as your principal home for more than 270 days per year and file Hawaii state income tax as a Kauai resident.

What evidence do I need to support my Kauai County property tax appeal?

To build a strong property tax appeal in Kauai County, you should gather recent comparable sales data showing what similar properties in your neighborhood have sold for within the past 6-12 months. Include photographs documenting any property defects, damage, or deferred maintenance that affects value. Obtain written repair estimates from licensed contractors for any significant issues like roof damage, foundation problems, or needed renovations. An independent appraisal from a licensed appraiser can provide professional support for your opinion of value. Also collect documentation of any errors in your assessment notice, such as incorrect square footage, wrong number of bedrooms/bathrooms, or inaccurate property characteristics. Form P-51 requires you to state a specific market value opinion, and your supporting evidence should justify that number.

What happens after I file a property tax appeal in Kauai County?

After you file your appeal with the required $75 deposit, the Real Property Assessment Division will process your application and schedule a hearing before the Board of Review. You will receive written notice of your hearing date in advance, giving you time to prepare your presentation. At the hearing, you will have the opportunity to present your evidence and explain why your assessment should be reduced. The Board will review your case, consider the evidence from both you and the county assessor, and issue a written decision. If your appeal is successful (fully or partially), your $75 deposit will be refunded and your assessment will be adjusted accordingly, resulting in a lower tax bill. If you disagree with the Board's decision, you have 30 days to appeal to the Hawaii Tax Appeal Court.

How much can I save by appealing my property taxes in Kauai County?

The potential savings from a successful property tax appeal in Kauai County depends on how much your assessment is reduced. With an owner-occupied tax rate of $2.59 per $1,000 of assessed value, every $10,000 reduction in your assessed value saves you approximately $25.90 per year. For example, if you successfully appeal a $600,000 assessment down to $550,000 (a $50,000 reduction), you would save approximately $129.50 annually. Over a five-year period until the next reassessment, that's about $647.50 in savings. National statistics show that about 25% of homes are overassessed, with successful appeals saving an average of over $1,000 annually. Given Kauai's high median home values exceeding $583,200, even modest percentage reductions can result in meaningful tax savings.

Can I appeal my Kauai County property tax assessment if I just bought the property?

Yes, you can appeal your Kauai County property tax assessment even if you recently purchased the property, and your recent purchase price can actually be strong evidence in your appeal. If you bought your property for significantly less than the assessed value shown on your assessment notice, this indicates the county may have overvalued your property since an arm's-length sale between willing parties represents true market value. You should submit your closing statement, purchase agreement, and any inspection reports that document property conditions at the time of sale. However, be aware that if you paid more than the assessed value, the county might use your purchase price to justify increasing your assessment. File Form P-51 by December 31, 2026 with your purchase documentation and the required $75 deposit fee.

What are the valid grounds for filing a property tax appeal in Kauai County?

Under Kauai County Code Section 5A-12.1, there are five valid grounds for filing a property tax appeal. First, you can appeal if the assessed value of your property exceeds by more than 15% the assessment to market value (overvaluation). Second, you can appeal due to lack of uniformity or inequality resulting from illegal assessment methods or errors in applying those methods. Third, you can appeal the denial of an exemption or dedication to which you are entitled and for which you meet all requirements. Fourth, you can appeal on constitutional or legal grounds if illegal or unconstitutional methods were used to arrive at your assessment. Fifth, you can appeal if your property's tax classification is incorrect according to Section 5A-6.4 or the Real Property Tax Classification Rules. You must check at least one ground on Form P-51, and you can select multiple grounds if applicable.

Official Resources

Kauai County Real Property Assessment Division →

Official county website with assessment information, exemption applications, appeal forms, and important dates for Kauai property owners.

Kauai County Online Property Tax Appeal Portal →

New online system launched in December 2025 for filing property tax appeals and paying the required deposit fee electronically.

Kauai Real Property Tax Search →

Search and view property records, assessment values, tax history, and ownership information for any property in Kauai County.

Hawaii Tax Appeal Court →

State-level administrative court for second-level appeals of property tax decisions from county Boards of Review.

For state-wide appeal information including Hawaii's assessment ratio and deadlines, see our Hawaii Property Tax Appeal Guide →

Considering professional help with your appeal? Compare pricing, coverage, and pros/cons in our Best Property Tax Appeal Services (2026) or browse side-by-side service comparisons →

More Hawaii Counties

Hawaii County (Hilo)Honolulu County (Honolulu)Maui County (Wailuku)

← All Hawaii property tax appeal info

Sources: https://www.kauai.gov/Government/Departments-Agencies/Finance/Real-Property-Tax/Assessment | https://www.tax-rates.org/hawaii/kauai_county_property_tax | https://kauainownews.com/2025/12/24/time-running-out-for-property-owners-to-file-appeal-of-their-2026-real-property-assessment/ | https://www.kauai.gov/Government/Departments-Agencies/Finance/Real-Property-Tax/Assessment/ExemptionTax-Relief-Information | https://propertytaxrates.org/exemptions/hawaii/

Last verified: 2026-07-24