Hawaii Mortgage Calculator: Oʻahu, Maui, Big Island & Kauaʻi
Hawaii is the only state where property tax isn’t a state matter at all — there is no state-level rate, only four counties writing four separate rulebooks. Honolulu, Maui, Hawaiʻi, and Kauaʻi each set their own residential rate, their own homeowner exemption, and their own idea of what “affordable” means. On top of that, this is the one U.S. housing market where whether you own the dirt under your house (fee simple) or just lease it (leasehold) can change your real monthly cost more than your interest rate does. Pick your island below and this tool rebuilds the math around it.
Start by choosing where you’re buying — each island rebuilds the tax math, insurance defaults, and the facts panel below
Honolulu County keeps things comparatively simple: file your home exemption and your owner-occupied property is taxed in the flat Residential class, well below the non-owner-occupied rate.
Loan & Property Details
Your Estimated Monthly Payment
Choose an island and enter your details to see a plain-language read on your payment.
What If You Paid Extra Toward Principal?
Given how large Hawaii loan balances tend to be, even a modest extra payment compounds fast. Slide to test one.
What If Your Rate Changes?
Your 5-Year Equity Snapshot
Why a Mainland Mortgage Calculator Gets Hawaii Wrong
Run a $900,000 home through a generic national calculator and it will apply one flat property tax percentage and call it done. Hawaii does not have a state property tax at all — zero, nothing — which means that flat percentage is a guess dressed up as a fact. Every dollar of property tax you pay is set by whichever of the four counties your home sits in, and each county has built its own classification system, its own homeowner exemption, and in Honolulu’s case, its own multi-tier rate for expensive homes. I built the island selector above specifically so you never have to translate a mainland assumption into a Hawaii reality by hand.
Four counties, four rulebooks: how the tax math actually works
Each county assesses your property at 100% of fair market value, then subtracts your homeowner exemption if you occupy it as your primary residence, then applies its own residential rate to what’s left. Here’s what that looks like on a $700,000 Kauaʻi home for a buyer under 60:
| Market value | $700,000 |
| Kauaʻi homeowner exemption (under 60) | – $160,000 |
| Net taxable value | $540,000 |
| Kauaʻi effective residential rate | ≈ 0.23% |
| Estimated annual tax | $540,000 × 0.23% ≈ $1,242 |
Swap that same $700,000 home to Maui County and the math changes twice over: Maui’s exemption for an owner-occupant is larger, and its effective rate runs even lower, which is part of why Maui posts some of the lowest effective property tax rates of any county in the United States, not just Hawaii. Swap it to Honolulu and the exemption shrinks but the county keeps a simpler, flatter residential structure below the $2 million tier. None of this shows up in a calculator that only knows fifty state-level percentages.
The homeowner exemption is not a small detail here
On the mainland, a homestead exemption might shave a few thousand dollars off your assessed value. In Hawaii, the exemption itself can rival the price of a mainland starter home. Honolulu’s base exemption runs around $120,000 and steps up for owners 65 and older; Hawaiʻi County’s starts lower but is tiered aggressively by age; Maui and Kauaʻi both build in substantial age-based increases on top of their already-generous base exemptions. Two identical houses, one owner-occupied and one not, can carry meaningfully different tax bills purely because of this one filing. Confirm the exact current dollar figure with your county’s real property tax office before closing, since counties adjust these figures periodically and this calculator’s defaults are informed estimates, not a legal filing.
Leasehold versus fee simple: the variable no other state has
Because of Hawaii’s land tenure history, a meaningful share of the market, especially older condos and some Oʻahu subdivisions, is sold leasehold: you own the building, but a landowner or trust owns the ground beneath it and you pay ground rent on top of your mortgage. Fee simple, where you own both, is now the majority of the market following decades of land reform, but leasehold properties still trade, often at a discount that can look tempting until the ground lease renegotiates. This calculator flags the distinction with the callout above rather than guessing at a lease rent figure, because those terms are unique to each individual lease.
Insurance is the real wildcard, not the tax bill
With property tax this low, insurance is often the line item that actually moves a Hawaii buyer’s monthly payment. Maui’s insurance market tightened noticeably after the 2023 Lahaina wildfire, with several carriers pulling back from wind and wildfire coverage on the island. On the Big Island, insurers price coverage by lava zone, and homes in the higher-risk zones near active flow paths can face steep premiums or difficulty finding standard coverage at all. Kauaʻi and Oʻahu carry more conventional hurricane exposure. Whatever your island, get a real quote before you finalize a purchase; the insurance figure in this calculator is a starting estimate, not a binding number.
For condo buyers: the maintenance fee can rival the mortgage payment
More than half of homes sold on Oʻahu each year are condos, and Honolulu Board of Realtors data has put the average Oʻahu condo maintenance fee north of $1,000 a month, with smaller units often in the $500–$900 range and larger, amenity-heavy units well above $1,500. These fees typically bundle water and sewer, the building’s master hazard insurance policy, and staffing, which is part of why they run so much higher than a typical mainland HOA fee. Switch the property type toggle above to Condo to relabel that field and budget it realistically rather than treating it as an afterthought.
Common Mistakes Hawaii Buyers Make With the Numbers
- Applying a national average property tax rate. Every Hawaii county sits well below the national average; using a mainland percentage overstates your real bill significantly.
- Forgetting to file the homeowner exemption. It is not automatic in any of the four counties and must be filed with your specific county’s real property tax office after closing.
- Budgeting insurance like a mainland state. Lava zone, wildfire-urban-interface, and hurricane exposure vary so much by specific address that a single statewide insurance estimate can be meaningfully wrong in either direction.
- Treating a condo maintenance fee like a rounding error. On many Oʻahu condos it is larger than the property tax and insurance combined.
- Not asking about leasehold status early. Some lenders won’t finance a short remaining lease term at all, which can blow up a deal late in escrow.
Tips for Lowering Your Hawaii Mortgage Payment
- File your county homeowner exemption immediately after closing — it is the single largest lever on your tax bill and it never applies retroactively.
- If a borrower on title is 60 or older, confirm your county’s age-tiered exemption; several counties add tens of thousands of dollars in additional exemption at that threshold.
- Get condo insurance and maintenance-fee history in writing before waiving your inspection contingency; a building with deferred maintenance or an underfunded reserve can mean a special assessment down the road.
- Compare rate quotes from at least three lenders that actively write Hawaii mortgages; some mainland lenders price Hawaii loans conservatively due to unfamiliarity with leasehold and condo master-policy underwriting.
- Use the extra-payment scenario above; because Hawaii loan balances are large, even $150–$200 extra a month can cut years off a 30-year term.
Frequently Asked Questions
Does Hawaii have a state property tax?
No. Hawaii is the only U.S. state with no state-level property tax at all. Property tax is set and collected entirely by the four counties: Honolulu, Maui, Hawaiʻi, and Kauaʻi, each with its own rates and exemptions.
Why are Hawaii’s effective property tax rates so low?
Hawaii counties tax residential property at effective rates that are among the lowest in the country, roughly 0.15% to 0.30% depending on the county, partly because counties rely more heavily on tourism-related revenue and generous owner-occupant exemptions than on residential property tax.
What is the Hawaii homeowner exemption?
It is a dollar reduction to your home’s taxable value, available to owners who occupy the property as their primary residence. The exact amount and any age-based increase varies by county and must be filed with your county’s real property tax office; it is not automatic.
What is the difference between fee simple and leasehold in Hawaii?
Fee simple means you own both the structure and the land beneath it. Leasehold means you own the structure but lease the underlying land, usually from a large landowner or trust, and pay ground rent separately from your mortgage.
Can I get a mortgage on a leasehold property in Hawaii?
Often, yes, but many lenders require a minimum number of years remaining on the lease and price the loan differently than a fee simple property. Confirm financing eligibility with your lender before making an offer on a leasehold home.
How much are condo maintenance fees in Hawaii?
On Oʻahu, average condo maintenance fees have run north of $1,000 a month according to Honolulu Board of Realtors sales data, with smaller units often lower and larger, amenity-rich units running well above $1,500 a month. Fees are generally lower on the neighbor islands.
Is Hawaii homeowners insurance expensive?
It varies enormously by island and even by specific address. Lava zone designation on the Big Island, wildfire exposure on Maui, and hurricane exposure statewide can all push premiums well above mainland averages for otherwise similar homes.
What down payment do I need to buy a home in Hawaii?
Conventional loans often start around 5% down, FHA loans typically require 3.5%, and VA loans can allow 0% down for eligible veterans, which is common given Hawaii’s significant military population.
Does this calculator include Hawaii’s conveyance tax?
No. This tool estimates your ongoing monthly payment only. Hawaii’s conveyance tax is a one-time closing cost, typically paid by the seller, that ranges from about 0.10% to 1.25% of the sale price depending on the price tier and whether the buyer will occupy the home.
Which Hawaii county has the lowest property taxes?
Maui County consistently posts the lowest effective residential property tax rate in the state, and by some measures the lowest of any county in the entire United States, due to its combination of a low rate and a generous owner-occupant exemption.
References
- City and County of Honolulu, Real Property Assessment Division, FY2026–27 tax rates – realproperty.honolulu.gov
- Maui County, Kauaʻi County, and Hawaiʻi County Real Property Tax Offices, exemption and rate schedules – county government sites
- Freddie Mac Primary Mortgage Market Survey, weekly national rate averages – freddiemac.com/pmms
- Honolulu Board of Realtors, condo maintenance fee and median price data – hicentral.com
- Hawaii Department of Taxation, Chapter 247 conveyance tax schedule – tax.hawaii.gov
Related DexoCalc Tools
This Hawaii mortgage calculator is part of the Mortgage Calculators cluster I am building out on DexoCalc. Compare Hawaii against the mainland with the national Mortgage Calculator, see how a similarly high-cost market handles its own property tax quirks in the California Mortgage Calculator, or check the Alabama Mortgage Calculator to see just how differently a low-cost, assessment-ratio state prices out. Browse every state-specific tool as new ones publish on the full Mortgage Calculators hub.
This calculator provides estimates for educational purposes only and is not a loan offer, pre-approval, or substitute for advice from a licensed Hawaii mortgage professional or real estate attorney, particularly regarding leasehold financing. Property tax, exemption, and insurance figures are approximations that vary by county, age, and property; confirm exact figures with your county real property tax office and insurance carrier. Sources: county real property tax offices, Freddie Mac, Honolulu Board of Realtors.