Honolulu County, HI property tax appeal guide for 2027

Honolulu County’s 2027 real property assessment appeal cycle is strict and short. For this cycle, assessment notices are modeled as issued on December 15, 2026, and Board of Review appeals are due January 15, 2027. Honolulu’s official instructions state that the appeal filing deadline is January 15 preceding the tax year, and that the deadline is fixed even if January 15 falls on a weekend or holiday. Hand-delivered filings must be time-stamped by 4:30 p.m. HST, mailed appeals must be postmarked by January 15, and online appeals must be submitted by 11:59 p.m. HST through the City’s site (Honolulu Notice of Real Property Assessment Appeal instructions).

Key 2027 dates

• Assessment date: October 1, 2026.
• Modeled notice date and opening of regular Board of Review cycle: December 15, 2026.
• Appeal deadline: January 15, 2027.
• Comparable-sale window for this page: October 1, 2025 through June 30, 2026.
• Appeal body: Board of Review for the City and County of Honolulu.

When a value appeal may fit

The most common residential-style value argument uses the ground Assessment of the Property Exceeds by More Than 10% the market value of the property. Use this ground when comparable fee simple market sales show that the assessed value is more than 10% above the property’s fee simple market value as of October 1, 2026. Honolulu’s form requires the owner’s or taxpayer’s opinion of fee simple market value for value disputes (Honolulu Notice of Real Property Assessment Appeal instructions).

Good comparable evidence should use fee simple market sales of genuinely comparable properties. Prefer open-market, arm’s-length transactions. Avoid leasehold-only indications when they do not represent full fee simple value, related-party or non-market transfers, distressed or unusual-condition sales, and sales with unusual financing unless the differences are clearly explained and adjusted.

Honolulu’s reviewed appeal materials do not publish a strict maximum radius, strict building-area or lot-size variance, or strict cap on the number of comparable sales for taxpayer evidence. A practical TaxSauce workflow should start with the closest and most similar properties, often within 1 mile for residential properties, then explain why any farther sale is still comparable.

Other Honolulu appeal grounds

The Board of Review form also lists these grounds:

1. Lack of Uniformity or Inequality. Use this when illegality of the methods used or an error in applying the methods caused unequal or non-uniform treatment. This can include value disputes and classification disputes, including denial of a dedication.
2. Denial of an Exemption. Use this when an exemption was denied even though the taxpayer claims entitlement and qualification. Identify the exemption type and claimed exemption amount.
3. Illegality. Use this for illegality under the U.S. Constitution, federal law, Hawaiʻi law, or City ordinance. Honolulu’s instructions note that the Board of Review does not have authority to decide federal constitutional or federal-law questions (Honolulu Notice of Real Property Assessment Appeal instructions).

Filing steps

Honolulu allows Board of Review appeals by online submission, mail, or hand delivery. Evidence and supporting documents are encouraged with the appeal or shortly afterward. If evidence is sent separately, include the owner name, parcel ID or TMK, appeal year, and contact information. Honolulu’s instructions also state that separate appeal forms and separate $50 deposits are required for multiple parcel IDs, multiple classifications, or multiple tax years (Honolulu Notice of Real Property Assessment Appeal instructions).

TaxSauce can help estimate a fee simple market value range, identify comparable sales, organize property-condition evidence, prepare a draft appeal packet, and create a homeowner review checklist. The property owner reviews the packet, chooses whether to file, and submits it through the City’s accepted filing option.

Tax rate used for estimates

For this page, the 0.0035 effective tax rate reflects Honolulu’s adopted Residential class rate for the fiscal year July 1, 2026 to June 30, 2027: $3.50 per $1,000 of net taxable real property value. Honolulu’s Resolution 26-62 also lists other classes and tiers, including Residential A, Hotel and resort, Commercial, Industrial, Bed and breakfast home, and Transient vacation, so the correct rate can differ by classification and tier (Honolulu Resolution 26-62).

As a sample success metric, Honolulu’s FY2024 budget materials reported that the Real Property Assessment Division closed 52% of FY2022 Board of Review appeal cases for residential properties valued under $1,500,000 within six months. That is a processing benchmark, not a taxpayer win rate or a guarantee of timing for a 2027 appeal (City and County of Honolulu Proposed Operating Budget FY2024).