A buyer comparing Big Sky to Bozeman on a portal sees a headline number and a monthly payment estimate. Both are close to useless here. Montana is a non-disclosure state, so the sold prices feeding those portals come only through the Big Sky Country MLS, and Big Sky's inventory is thin enough that a single closing at Yellowstone Club-adjacent pricing can drag the median $500,000 in either direction month over month. Zillow currently pegs the typical Big Sky home value at roughly $1.64M as of mid-2026, down about 6.8% year over year, while Outlaw Realty's March–April 2026 window shows an average sale price of $3.64M against an average list of $4.54M. Those are not contradictions. They are different slices of a market where the sale price is only one input into what the property actually costs to own.
The thesis is simple and the research supports it in numbers: in Big Sky, the annual carrying stack is a second price tag, it is often disclosed on separate documents from the listing, and it has been rising faster than the sale prices it sits on top of.
The number that isn't on the listing
The clearest piece of evidence sits in the public dues sheets Spanish Peaks Mountain Club has issued over the last two years. On the December 18, 2023 sheet, a Social Membership showed a $100,000 refundable deposit and $17,000 in annual family dues, with a Signature Golf Membership at a $200,000 deposit and $24,000 in dues. The December 1, 2025 sheet puts Social at $150,000 and $23,000, and Signature Golf at $300,000 and $30,000. Spanish Peaks Owners Association dues, billed separately, moved from $3,250 to $3,750 across the same period.
That is a roughly 35% jump in annual family dues in twenty-four months, on a line item that never appears on an MLS sheet.
A buyer running a five-year hold on a Signature Golf property in Spanish Peaks is now underwriting an extra $30,000 in dues plus $3,750 in SPOA every year, on top of a six-figure deposit that is refundable on terms set by the club, not the buyer.
For a $4M home, that stack is over 20% of the sale price across a five-year hold before a single mortgage payment, property tax, insurance premium, or utility bill. It is the reason portal affordability calculators are structurally wrong for this market.
Four dues lines, not one
The mid-mountain product in Big Sky can carry as many as four independent recurring assessments, each with its own governing body, fiscal calendar, and enforcement mechanism. Buyers who model them as a single line item miss most of the risk.
| Line item | Who levies it | What it funds | Notes for underwriting |
|---|---|---|---|
| Club deposit + annual dues | Spanish Peaks, Moonlight Basin, Yellowstone Club | Golf, clubhouse, ski access, family programming | Deposit terms and refundability vary; approval and waitlists apply |
| Sub-community owners association | Spanish Peaks Owners Association and equivalents | Roads, common areas, architectural review inside the club | Separate from the club dues, not bundled |
| Big Sky Owners Association assessment | BSOA, covering 2,400+ properties across 8,000 acres in Gallatin and Madison counties | Winter road maintenance, weed and pest control, architectural review, open space | Flat assessment, same for a lot, a condo, or a house; billed October 1, fiscal year runs October 1 to September 30 |
| Property HOA or condo association | The individual project | Snow removal, landscaping, building reserves, master insurance | Reserve study is the document to demand; special assessments are the tail risk |
A buyer looking at a Spanish Peaks residence pays into all four. A buyer at a Town Center condo skips the club line but still has HOA, BSOA, and potentially a condo-hotel program layer. A buyer on a raw lot inside the BSOA still owes the BSOA assessment even before there is a structure to insure.
The mechanical takeaway: comparing a $1.9M Town Center condo to a $1.9M Spanish Peaks residence on price alone is a category error. The Spanish Peaks residence may carry $30,000 to $35,000 more in annual dues once membership is factored in. That gap is the effective valuation adjustment.
Moonlight Basin plays by different rules
Moonlight's public membership schedule is tiered differently, with Signature, Sports, and National categories, and the club's own materials emphasize that property ownership does not automatically require membership. Some Moonlight homes convey a membership position, many do not. Reciprocity with The Reserve Golf Course, access to Ulery's Lake, Moonlight Lodge, LakeLodge, sporting clays, and private Jack Creek Road access all sit inside Signature. A Signature member at Spanish Peaks gets reciprocal tee times at The Reserve, capped at ten annually with 48-hour advance reservations, which sounds generous until it collides with peak summer demand.
The friction that catches buyers: two homes in Moonlight can list within $50,000 of each other and represent entirely different asset classes depending on whether a membership position is included, transferable, or requires new application. That distinction shows up in a club estoppel, not a listing description.
The resort tax is a rental variable, not a sales variable
Big Sky Resort Area District administers a 4% resort tax on luxury goods and services within the district, raised from the original 3% adopted in 1992 after Senate Bill 241 gave qualifying communities the option to add a project-tied percentage point. Funds flow to infrastructure, transit, the community library, ambulance, and, more recently, workforce housing land acquisition tied to the Big Sky Water and Sewer District's capacity expansion.
For an owner-occupier, the resort tax barely registers. For a buyer underwriting a short-term rental pro forma, it is a 4% skim on nightly revenue that has to be collected and remitted through the MUNIRevs portal, filed even in zero-revenue months. Businesses that report on time keep 5% of collections as an administrative allowance, which is a small offset. Combined with the state's lodging taxes and any HOA-level rental restrictions, the resort tax turns "gross rental yield" into a number that has to be modeled on the net.
Condo-hotel is a separate underwriting problem
A condo unit inside a branded hospitality program at Big Sky is not the same asset as a standalone condo across the road. Program agreements typically limit owner-use nights, impose blackout windows during peak weeks, take housekeeping and FF&E reserve charges off the top, and route revenue through a management structure whose fee stack shows up only in the audited income reports. Lenders often underwrite these units as investment properties with tighter debt-service coverage requirements and larger down payments, which narrows the resale buyer pool and lengthens marketing timelines outside peak seasons.
The single document that resolves most of the guesswork is the reserve study. It is the engineering analysis of when the roof, elevators, snowmelt system, and building envelope come due, and it is where a $1,500-per-month HOA line either holds or reveals itself as underfunded ahead of a five- or six-figure special assessment.
What to pull before removing contingencies
The valuation work in Big Sky is largely a document-collection exercise. A disciplined buyer requests, in writing:
- The club estoppel, current dues schedule, and confirmation of whether membership conveys, requires approval, or sits on a waitlist
- The sub-community owners association budget, reserves, and minutes for the last twelve months
- The BSOA assessment status and any compliance items tied to the parcel
- The HOA reserve study, twelve months of board minutes, master insurance certificate, and any pending or discussed special assessments
- For condo-hotel product, the management agreement, historical monthly occupancy and RevPAR, and the full FF&E reserve schedule
- Confirmation of well, septic, and utility status, since parts of the district still operate on private systems
Every one of these documents has a fee or a friction point that can be negotiated during the contingency period. None of them are visible on a listing photo.
Short FAQ
Does the Big Sky Owners Association assessment vary by property size? No. The BSOA charges the same annual amount to a condo owner, a homeowner, an undeveloped lot owner, and a commercial lease holder within its boundaries. The assessment is billed October 1 and covers the October-through-September fiscal year.
If a Spanish Peaks membership deposit is refundable, why treat it as a cost? Because refundability is conditional on club rules, resale timing, and, in some categories, the arrival of a replacement member. The opportunity cost of $150,000 to $300,000 parked with the club, plus the annual dues that are not refundable, is the real number to model.
Does the 4% resort tax apply to a home sale? No. It applies to lodging, restaurants, alcohol by the drink, and defined luxury retail inside the district. Real estate transactions themselves are not resort-taxed. The exposure is on the rental income side of a hold, not the acquisition.
If you are pricing a Big Sky property against a Bozeman comparable, or evaluating two Big Sky listings that look similar on the MLS and diverge sharply once the dues stack is drawn out, that is the work Sunny Odegard does before an offer is written. Get Your Instant Home Valuation to start the conversation with numbers that include every line the listing leaves off.
