If you bought a home on Oahu this year and you have not filed for your home exemption yet, you have until September 30. Miss it and you wait a full year for another shot.
This is the single most common thing new homeowners here leave on the table. Escrow does not file it for you. Your lender does not file it for you. I do not file it for you. It is on the owner, and plenty of people do not find out until their first assessment notice arrives in December looking higher than they expected.
The good news is that filing takes a few minutes and it is free.
What the home exemption actually does
The City and County of Honolulu taxes your property based on its assessed value. The home exemption lowers the portion of that value you get taxed on.
Right now it reduces the taxable value of an owner occupied principal residence by:
- $120,000 for most owners
- $160,000 if the owner is 65 or older
So if your home is assessed at $800,000 and you qualify for the standard exemption, you are taxed as though it were assessed at $680,000 instead.
In the county’s own published example, a Residential class property is taxed at $3.50 per $1,000 of net taxable value. On that basis the standard exemption is worth roughly $420 a year. Rates are set annually, so confirm the current one on your assessment notice, but that is the order of magnitude for most homes.
And if your home is assessed at $1,000,000 or more, it is worth vastly more than that. Which brings us to the part of this that catches people badly.
The $1 million trap: Residential A
This is the one that costs real money, and most homeowners have never heard of it.
Honolulu has a separate tax classification called Residential A. Under the Revised Ordinances of Honolulu, a property lands in it when it is assessed at $1,000,000 or more and does not have a home exemption. That applies to single family homes on residential zoned land and to condominium units alike.
Residential A is taxed on a two tier system rather than the flat residential rate. Here is the county’s own worked example, using a home assessed at $1,600,000:
- With the home exemption. Taxed as Residential at $3.50 per $1,000. Net taxable value $1,480,000. Annual tax: $5,180.
- Without the home exemption. Classified Residential A. Tier 1 charges $4.00 per $1,000 on the first $1,000,000, and Tier 2 charges $11.40 per $1,000 on everything above it. Annual tax: $10,840.
That is a difference of $5,660 a year on the same house. More than double, for a form that takes a few minutes.
Look at what Oahu homes and condos actually sell for and you can see why this matters here more than it would almost anywhere else. A million dollar assessment is not an unusual house on this island. It is a normal one in a lot of neighborhoods. So the home exemption is not just a modest annual discount. For a large number of owners it is the thing standing between them and a tax bill twice the size.
The classification is assessed on the October 1 valuation date. If you bought a home over $1,000,000 this year and have not filed, this is the deadline to care about.
The amounts are going up, and that is why this year matters
Effective July 1, 2027, the exemption amounts increase to:
- $140,000 for most owners
- $180,000 for owners 65 and older
That is an extra $20,000 of value coming off the taxable amount. To get it, the county says to file by September 30, 2026.
If you have been meaning to get around to this, it is a better year than most to stop meaning to.
Do you already have it? Then you probably do nothing
This is the part I want to be clear about, because I would rather not send half the island filing paperwork they do not need.
If you already have a home exemption and nothing has changed about the ownership or the use of the property, you do not need to refile. It carries forward on its own. The increase takes effect without you doing anything.
You need to act if any of these describe you:
- You bought your home recently and have never filed
- The ownership changed, for example you added a spouse to title or moved the property into a trust
- The use changed, for example a unit you were renting out is now your primary residence
- You are newly 65 and did not provide proof of age when you first filed
On that last one, there is a detail worth knowing. If you did provide proof of age when you originally filed, the county adjusts your exemption to the higher senior amount automatically when you reach the age. You do not have to catch it yourself.
The tip almost nobody knows
The Real Property Assessment Division encourages all occupants on title to file, not just the primary applicant.
The reason is protective. If something happens to the person who filed, the exemption does not fall through a crack while the surviving owner is dealing with everything else. If you and your spouse are both on title, both of you filing is a small piece of housekeeping that can matter a great deal later.
I have never had a client tell me they knew this before I mentioned it.
Who qualifies
The exemption applies to property you own and occupy as your primary home. That is the whole test, and both halves count. A rental you own does not qualify. A home you occupy but do not own does not qualify.
If part of your property is used commercially, that portion does not qualify. This comes up more than you would think on Oahu, where plenty of homes have a converted space or a ground floor unit doing double duty.
If you are not sure how your situation reads, call the division directly at (808) 768-3799. They answer this question all day and they are good about it.
How to file
You have three options.
- Online. The fastest way. Go to the Home Exemption page and use the file online link.
- By mail. Download form E-8-10.3 from that same page, fill it out, and mail it in.
- In person, at either office:
842 Bethel Street, Basement, Honolulu, HI 96813
1000 Ulu’ohi’a Street, #206, Kapolei, HI 96707
There are separate continuance forms if you have relocated to a care home or facility, or relocated temporarily, and a reoccupation form for coming back. Those are on the same page. If one of those applies to you, it is worth reading rather than assuming your exemption simply lapsed.
The other dates worth putting on your calendar
The county runs on a fixed annual cycle. These are the ones that affect you as a homeowner:
- September 30 — deadline for exemption claims and tax credit applications
- October 1 — the date your property is valued for the next tax year
- November 1 — deadline for reporting changes that affect your exemption
- December 15 — assessment notices mailed
- January 15 — deadline to appeal your assessment
- July 20 and January 20 — tax bills mailed
- August 20 and February 20 — payments due
That December 15 date is the one to watch. When your assessment notice shows up, actually open it. If the number looks wrong, you have until January 15 to appeal, and that window does not reopen.
One obligation that runs the other way
The exemption comes with a duty attached, and it is easy to miss.
If your property stops qualifying, for instance you move out and rent it, or you sell it, you are required to report that within 30 days, and no later than November 1. It is the owner’s responsibility, not something that happens automatically.
This matters most for people who move to the mainland for a job or a military assignment and rent the house out. The exemption was for your primary residence. Once it is not, it needs to come off.
The short version
If you bought this year, file by September 30. It is free, it takes a few minutes online, and it lowers your taxable value by $120,000 or more for as long as you live there.
If you already have it and nothing has changed, you are set. Enjoy the increase in 2027 without lifting a finger.
And if you are not sure which of those you are, that is a five minute phone call to (808) 768-3799 rather than a year of wondering.
If you bought a home with me this year and you want me to double check that you are squared away, just reach out. No charge and no catch. I would rather you keep the money.
Devin Hammack is a Navy veteran and Realtor Associate (RS-87047) with Island Homes Oahu, brokered by eXp Realty. Exemption amounts, deadlines and forms in this article come from the City and County of Honolulu Real Property Assessment Division, retrieved September 11, 2026. This is general information and not tax advice. Confirm your own situation with the division or your tax professional.
