What It Costs to Sell a House on Mercer Island
Page author
Adriano Tori
Designated Broker, Founder & CEO — RexMont Real Estate · WA Lic. #27660
Adriano leads RexMont Real Estate — the most-reviewed real estate brokerage in Seattle and the Eastside. 1,200+ closed transactions, $1B+ in production, and 1,241 five-star Google reviews.
Before you list, the number that matters is not your sale price — it is your net proceeds: the wire-out amount after every selling cost and your mortgage payoff. Mercer Island's price points make one cost dominate the conversation: Washington's graduated excise tax, which routinely reaches the 2.75% tier here and the 3.00% tier on waterfront — turning REET into a five-to-six-figure line that many island sellers see clearly for the first time at closing.
I am Adriano Tori, founder and Designated Broker of RexMont Real Estate, WA Lic. #27660. RexMont has 1,241 5-star reviews and $1B+ closed across 1,200+ transactions across Mercer Island, Bellevue, and Seattle. On every consultation I build the full net-proceeds sheet against your actual home — not a generic percentage — so you decide with real numbers.
Total Mercer Island seller costs usually land between 6.5% and 9% of sale price — the commission percentage often compresses at island price points while REET expands. On a $2.5M sale, combined state and King County REET runs roughly $58,000. Model it before pricing your next move, not at the closing table.
Mercer Island net-proceeds calculator
Enter your numbers to see your estimated net proceeds after commission, Washington excise tax, title/escrow, prep, and mortgage payoff. The 0.50% local REET portion is calculated automatically.
Your target list/sale price — or get an agent-prepared estimate.
Sellers typically negotiate 4.5%–6% total. Post-NAR settlement, buyer-agent compensation is negotiated separately.
Remaining principal from your latest statement.
Paint, staging, cleaning, photography, minor repairs.
Typically $1,800–$3,000 for the seller side.
Estimated net proceeds
$1,599,713
after $200,288 in selling costs (8.0% of price) and mortgage payoff
Estimates for educational purposes only. Not financial, tax, legal, or investment advice. Actual REET, commission, escrow, and payoff figures vary by transaction and closing date. King County REET shown is the state graduated tax plus the 0.50% local portion; verify current rates with WA DOR and your CPA before acting.
Commission at island price points
Commission is negotiated on every listing, and at Mercer Island values the structure matters more than the headline rate: a well-negotiated fee on a $2.5M home funds estate-grade media, aerial and twilight photography, and the patient, qualified-buyer process island homes deserve — and still often totals a lower percentage than a commodity listing. Since the August 2024 NAR settlement, buyer-agent compensation is a separate seller decision, and at this price point sellers hold real leverage on it.
The island's diligence list is its own: waterfront homes carry dock, bulkhead, and moorage documentation; mid-century view homes carry systems and foundation questions; and buyers at these prices arrive well-advised. Assembling the record before launch — and handling the Form 17 under RCW 64.06 from documented facts — is what keeps a seven-figure price intact through inspection. Full commission mechanics on the Mercer Island commission page.
The excise tax reality above $1.525M
Washington REET is graduated: 1.10% up to $525K, 1.28% to $1.525M, 2.75% to $3.025M, and 3.00% above — each rate applying only to the slice in that tier — plus King County's 0.50% on the full price. Nearly every Mercer Island sale reaches the 2.75% tier; waterfront regularly reaches 3.00%. On a $2.5M sale that is roughly $58,000; on a $4M waterfront sale, roughly $109,000. This is the line that most surprises island sellers, and it belongs in the plan from day one.
Title, escrow, and prorations are comparatively small at these price points but still real — the seller customarily pays the owner's title policy, escrow is split, and property tax is prorated from King County Assessor records. Prep is the strategic line: island buyers pay decisively for move-in-ready, and selective preparation triaged against your actual comps consistently outperforms both extremes.
FAQ
Cost to sell on Mercer Island — FAQs
What does it cost to sell a house on Mercer Island?
Plan for roughly 6.5%–9% of sale price all-in: negotiated commission, Washington excise tax — the dominant line at island prices, roughly $58,000 on a $2.5M sale — plus title, escrow, and prep. Waterfront adds dock and bulkhead diligence.
How much is the excise tax on a Mercer Island sale?
The state schedule is graduated and nearly every island sale reaches the 2.75% tier (price between $1.525M and $3.025M), with 3.00% above that — plus King County's 0.50% on the full price. Roughly $58,000 on $2.5M; roughly $109,000 on $4M.
Are commissions negotiable at Mercer Island price points?
Yes — and the leverage runs in the seller's favor at higher values. The right conversation is about structure: what the fee funds (estate media, aerial, qualified-buyer process) and what the projected net looks like, not the headline percentage alone.
Do I pay capital gains selling my Mercer Island home?
The federal primary-residence exclusion ($250K single / $500K married filing jointly) covers less of the gain at island appreciation levels than most owners expect — long-tenure sellers should model this with a CPA before setting a timeline. Investment property does not qualify.
How do I get an exact net number for my island home?
Use the calculator on this page for the estimate, then request RexMont's full seller net sheet — the same line-item statement escrow produces, tied to your address, payoff, and closing date. No obligation.
Mercer Island seller net analysis
Get your exact net-proceeds sheet.
Send the address, your mortgage payoff, and target timing. RexMont will return a line-by-line net-proceeds estimate — sale price, commission, REET at island tiers, title, escrow, prep, and payoff — so you see the real wire-out number before you list.