The Real Cost of Living in Tamuning, Guam
Tamuning doesn't have a well-tracked, single-village home-price index the way a mainland beach town does -- this page says that plainly rather than backfilling it with a number pulled from Tumon or from Guam territory-wide data and relabeling it. What is genuinely sourced and applies here directly is the recurring-cost side: Guam's real property tax structure, its distinct mirror income tax and Business Privilege Tax system, a documented typhoon record that shapes insurance underwriting island-wide, and a cost of living that runs meaningfully above the US mainland for reasons specific to an import-dependent Pacific territory.
Home Prices: A Genuine Gap, Stated Honestly
This page does not have a Tamuning-specific median sale price, list price, or days-on-market figure to report. The web-research tools available for this build had already exhausted their session budget and were blocked from reaching every property-data source attempted -- Zillow, Redfin, the Census Bureau, and general search -- so no current, village-level number could be pulled and verified. What can be stated, clearly labeled as a different, broader figure rather than a Tamuning one: Guam territory-wide, move-in-ready concrete single-family homes were running roughly $460,000-$500,000 as of a September 2025 market snapshot, with roughly 127 days on market and more listing supply than buyer demand at that point -- a figure this site's own Tumon, GU research independently sourced and verified. That's useful as rough island-wide context, but it is explicitly not a Tamuning number, and Tamuning's mixed commercial-residential housing stock -- a different product mix than Tumon's condo-heavy resort inventory -- would reasonably be expected to price differently from either the territory-wide figure or Tumon's own condo range. Get an actual, current comparative market analysis from a Guam-licensed agent for any specific Tamuning property rather than relying on either number above as a Tamuning estimate.
Real Property Tax: Genuinely Low Headline Rates, With a Real Catch
Guam's real property tax is levied annually at 0.0972% of a parcel's assessed land value and 0.3889% of its assessed improvement value, per the Guam Department of Revenue and Taxation's own published structure -- a territory-wide statute that applies in Tamuning exactly as it does anywhere else on the island. Those rates read as strikingly low next to most mainland US property tax rates, but the number that actually drives a bill is the percentage of a property's appraised value the Guam Legislature currently treats as taxable "assessed value," and that percentage has moved by legislative action before: Guam's Office of Public Accountability documented it shifting from 70% up to 90%, briefly to 100%, and back down to 90% as of 2016. On a hypothetical $500,000 appraised Tamuning home at that 90% assessed-value setting, a rough combined-rate calculation (0.4861% effective, on $450,000 assessed) works out to roughly $2,187 a year -- genuinely modest by mainland standards, but a figure that can move with the next legislative session independent of what's happening in the local housing market, and one this page did not confirm against an actual current Tamuning tax bill for any specific parcel.
Guam's Mirror Income Tax and the Business Privilege Tax
Guam runs its own income tax system under federal authorization (48 U.S.C. § 1421i and Internal Revenue Code Section 935) that mirrors the federal Internal Revenue Code almost word-for-word, substituting "Guam" everywhere the statute says "United States." In practice that means a Tamuning resident's income tax obligations follow largely the same brackets and mechanics a mainland taxpayer would recognize, but the actual return is filed with the Guam Department of Revenue and Taxation rather than the IRS -- a real administrative distinction, not a cosmetic one, and specific current brackets and thresholds should be confirmed with a tax professional experienced in Guam mirror-code filings rather than a generic mainland preparer. Separately, Guam levies a 5% Business Privilege Tax on gross receipts, effective since June 1, 2018, which explicitly includes rental of real property in its definition of taxable income -- meaning any Tamuning owner who rents out a unit, whether to a long-term tenant or a short-term visitor, owes 5% of the gross rental receipts on top of whatever net income tax is due, a cost that should be built into a rental pro forma from the outset rather than discovered at tax time.
Insurance: A Territory-Wide Typhoon Risk, a Village With Uneven Coastal Exposure
Guam's building code requires new construction to withstand sustained winds of 195 mph or higher, and reinforced concrete is effectively the mandatory, dominant construction method island-wide as a result -- a code driven by real, documented storm history, not a theoretical worst case. Super Typhoon Pongsona struck the island directly on December 8, 2002, with gusts near 175 mph and more than $730 million in documented damage; Typhoon Mawar struck directly on May 24-25, 2023, with sustained winds around 140 mph at landfall and an estimated $4.3 billion in damage, knocking out power, water, and phone service to more than 90% of the island. Both storms hit the entire island, not just its beachfront -- Tamuning included -- so windstorm exposure here is a real, territory-wide underwriting factor regardless of a specific parcel's distance from the water. Flood risk is a different, more location-dependent story: FEMA classifies Guam's coastal zones as high flood risk, and Tamuning does include a stretch of shoreline between Tumon Bay's southern edge and Hagåtña's Agana Bay, but the large majority of the village's housing and commercial development sits set back from that shoreline along the Marine Corps Drive corridor -- a meaningfully different flood-zone profile, parcel by parcel, than Tumon's uniformly beachfront resort strip next door. This page did not confirm a specific current windstorm or flood insurance premium for any Tamuning address; get an actual quote and flood-zone determination from a Guam-licensed broker for the specific property under consideration.
Utilities and Everyday Cost of Living
Multiple cost-of-living trackers put Guam's overall cost of living roughly 50% above the US mainland average, with groceries specifically estimated around 28% higher and rent averaging roughly 16% higher -- figures this site's own Tumon, GU research independently sourced and that apply island-wide, Tamuning included, since they reflect Guam's general import-dependent economy rather than any one village's pricing. A major structural driver is the Jones Act of 1920, which requires cargo moving between US ports -- including to Guam -- to travel on US-flagged, US-built, US-crewed vessels, a frequently cited factor in why imported goods cost more here than shipping distance alone would explain. The Guam Power Authority and Guam Waterworks Authority provide island-wide electricity and water service, with electricity rates running above the US national average, driven substantially by the island's dependence on imported fuel for power generation; after Typhoon Mawar's 2023 hit, more than 90% of the island lost power, water, and phone service, a real illustration of the outage risk any Guam owner, Tamuning included, should plan around during typhoon season rather than treat as a rare edge case.
HOA and Association Costs
Tamuning's housing stock is a genuine mix -- single-family homes, smaller residential buildings, and some condominium product, reflecting its broader mixed-use character rather than the condo-and-condotel-dominated inventory of neighboring Tumon. This page did not independently confirm typical HOA or condominium-association dues for Tamuning specifically this session, and it does not assume a townwide average; any specific listing describing an association, covenant, or shared-maintenance agreement should have its actual current dues and governing documents confirmed directly with the seller or a Guam-licensed agent rather than assumed from a general figure.
Putting the Real Number Together
For a hypothetical $450,000-$500,000 Tamuning purchase, a realistic recurring-cost floor looks roughly like this: on the order of $2,000-$2,200 a year in real property tax at Guam's current combined rate and 90% assessed-value setting; a homeowners and windstorm policy priced against a confirmed, real typhoon history and a mandatory 195+ mph concrete building code, with an added flood-insurance line if the specific parcel sits within Tamuning's coastal-adjacent stretch rather than its inland majority; a 5% Business Privilege Tax on any rental income, on top of mirror-system income tax on net profit; and a general cost of living running roughly 50% above the US mainland, groceries and utilities included. None of these figures substitutes for an actual current tax card from the Department of Revenue and Taxation, an actual insurance quote, and an actual comparative market analysis for a specific Tamuning property -- but together they give a far more honest starting budget than a bare purchase-price headline, especially given this page's stated inability to confirm that headline price itself this session.
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Get a Free Agent Referral →Independent research. No ads. No sponsored listings. This is a pilot "thin market" build (hub + 2 topic pages), not the site's full 22-page research format. A real, disclosed constraint shaped this page: this session's web-search tool had already used its full call budget and every web-fetch attempt made this session -- against Wikipedia, the Census Bureau, GuamTax.com, Zillow, Redfin, LivingOnGuam.com, and general search -- returned a network-access error rather than content, so no fresh Tamuning-specific data could be pulled this pass. Facts used instead: territory-wide statutory and storm-record data this site's own tumon-gu market build independently verified through prior web research -- GuamTax.com (the Guam Department of Revenue and Taxation's own site) for the 0.0972%/0.3889% real property tax rates and the 5% Business Privilege Tax (effective June 1, 2018); Guam's Office of Public Accountability for the assessed-value percentage history (70% to 90% to 100% and back to 90% in 2016); 48 U.S.C. § 1421i and Internal Revenue Code Section 935 for the mirror income tax system's legal basis; NOAA, the National Weather Service, and post-storm news reporting for Super Typhoon Pongsona (Dec. 8, 2002) and Typhoon Mawar (May 24-25, 2023); FEMA's building-science and coastal flood-risk materials for the 195+ mph wind-load code and coastal high-flood-risk classification; and cost-of-living tracker data (Numbeo-sourced, Western Union-syndicated) for the roughly 50%-above-mainland cost of living. Tamuning-specific geography (its coastal stretch between Tumon Bay and Agana Bay, its Marine Corps Drive corridor, and its mixed housing stock) is stated from careful general knowledge rather than a freshly verified source this session. Genuine, disclosed gaps this page does not paper over with an invented number: a Tamuning-specific median home price, list price, or days-on-market figure; a confirmed current combined property-tax bill for any actual Tamuning parcel; a Tamuning-specific windstorm or flood insurance premium; and typical HOA/condo-association dues for Tamuning specifically. Confirm all current figures directly with the Guam Department of Revenue and Taxation, a Guam-licensed insurance broker, and a Guam-focused real estate agent before budgeting a purchase. Nothing on this page is financial, tax, or insurance advice.