Kauai County

Kauai sits firmly on the appreciation side of the spectrum, with a median home price of $1,014,244 and median rent of $4,456, producing a gross rent-to-price ratio of 0.0527% annualized, or roughly 0.44% monthly. That is thin. The cap rate comes in at 3.43%, which in most continental markets would signal an overpriced asset or compressed demand, but in Kauai's case reflects the structural reality of a supply-constrained island where land is finite and permitting is slow. The estimated monthly cash flow at 20% down ($202,849) is negative $2,420, and the cash-on-cash return at negative 12.45% makes clear that anyone financing a purchase at 6.85% is not buying yield, they are buying a bet on price. Home prices appreciated 1.94% year-over-year, modest in absolute terms but meaningful in the context of a market where the affordability index scores a 1 out of 100, the floor of the scale. At the national level, Kauai ranks 681st out of 1,000 counties, placing it in the 13th percentile overall, though it ranks first among Hawaii's four counties, which tells you more about how poorly Hawaii pencils as a cash-flow state than it does about Kauai's absolute attractiveness.

The numbers point to a single investor profile: the appreciation buyer with a long horizon, high liquidity, and no near-term need for the investment to service its own debt. A cash-flow buyer has no business here at current prices and rates. The negative $2,420 monthly cash flow means you are writing a check every month even after collecting $4,456 in rent, because the mortgage alone at $5,317 exceeds gross rent, before expenses. A value-add operator faces the same ceiling: you cannot renovate your way to a 6% cap rate when purchase prices are north of a million dollars and rental upside is bounded by what the local population can actually pay. The appreciation score of 69 is the one number working in Kauai's favor, reflecting the island's long-run supply constraints and desirability as both a primary residence and vacation destination market. If you believe home prices will compound at even 3% to 4% annually over a ten-year hold, the equity story has merit. The cash flow does not.

Kauai's economy is dominated by tourism and hospitality, which creates both the rental demand that supports a $4,456 median rent and the concentration risk that defines the downside scenario. The island has a population of just 73,511, making it the smallest county in Hawaii by headcount. A small, tourism-dependent economy means rental demand can contract quickly when travel slows, as was demonstrated during the pandemic period. There are no major diversified employment anchors, government installations, or university systems here of a scale that would cushion a hospitality downturn, and the data provided does not enumerate specific employers. Investors should underwrite with that single-sector dependence clearly in view.

On carry costs, Kauai benefits from Hawaii's very low property tax environment. The state-average effective rate is 0.28%, a genuine tailwind relative to the national norm, translating to approximately $2,840 annually on a $1,014,244 purchase. Combined with an estimated $1,420 in annual insurance, the monthly tax-and-insurance burden is $355, a relatively manageable component of the overall expense stack given the asset value. That said, the caveat matters: 0.28% is a state-average estimate per the Tax Foundation, and actual county or township-level rates on Kauai may differ, particularly for investor-owned or non-owner-occupied properties, which Hawaii has historically taxed at higher rates than owner-occupied homes. Run the actual county assessor figures before closing.

The primary risks here are concentration and affordability. A single-industry economy on a geographically isolated island with a population under 75,000 means your tenant pool is narrow and your exit market is thin. The affordability index of 1 signals that locals are largely priced out of ownership, which supports renter demand in theory, but at $4,456 median rent, that demand is itself concentrated among higher-income renters, tourists, or remote workers with above-average incomes. Any regulatory shift on short-term rentals, which Hawaii counties have moved to restrict in recent years, would reduce the effective rental ceiling for investors counting on vacation rental income to bridge the cash-flow gap.

Among Hawaii's four counties, Kauai scores highest overall at 45, but the comparison requires context. Hawaii County (the Big Island) offers a meaningfully better cash-flow profile with a median home price of $557,666, median rent of $2,618, and a rent-to-price ratio of 0.0563, compared to Kauai's 0.0527. For an investor prioritizing yield over appreciation, the Big Island is the more defensible buy. Honolulu County at $833,725 median price and a 0.040 rent-to-price ratio is worse on cash flow despite lower absolute prices, reflecting how compressed rents are relative to values in the urban core. Maui County at $993,613 median price and a 0.041 rent-to-price ratio is the weakest of the four on both cash flow and overall score (27), carrying Kauai's same supply-constrained appreciation narrative but with even thinner yield. Choose Kauai over its neighbors only if you are making a long-term capital appreciation argument, have the liquidity to absorb monthly negative cash flow, and have verified the county's actual non-owner-occupied tax rate. If yield matters at all to your underwrite, the Big Island deserves the first look.