Washington Capital Gains on Investment Property Sale (2026): 1031 Exchange, Recapture & Cash Sale Math
Washington capital gains on investment property sale: 1031 exchange rules, 25% depreciation recapture, 3.8% NIIT, partial Section 121, and real Seattle tax math.
A Washington investor selling a rental property in 2026 typically owes federal capital gains tax at 15% to 20%, federal depreciation recapture at a flat 25%, and potentially a 3.8% Net Investment Income Tax — but zero Washington state capital gains tax, because RCW 82.87.030 explicitly excludes real estate from the state's 7% tax. The combined federal hit on a $300,000 Seattle rental gain after 15 years of depreciation routinely lands between $60,000 and $95,000, which is why a 1031 like-kind exchange under IRC §1031 is the single most common move Washington landlords make when they want out.
This guide is for Washington investors — not primary-residence homeowners. The Section 121 exclusion that wipes out most owner-occupant home sales does not apply to a rental. The math, the deferral strategies, and the recapture trap all work differently when the property has been depreciated, leased out, or held purely for investment. Below is the 2026 framework: 1031 exchange mechanics, depreciation recapture under IRC §1250, the Section 121 partial exclusion for converted rentals, NIIT thresholds, opportunity zone deferral, and the real numbers on a Seattle, Tacoma, Olympia, and Spokane rental sold for cash.
> Important: This guide explains the 2026 framework for Washington investors in plain language. It is not tax or legal advice. Run every number through a Washington-licensed CPA before signing a purchase and sale agreement, opening a 1031 exchange, or accepting a cash offer — small basis or depreciation errors can swing the tax bill by tens of thousands of dollars.
The Short Version — Washington Investment Property Tax Math in 2026
The compressed version every Washington landlord should know before listing a rental:
Why Investment Property Tax Math Is Completely Different from a Primary Residence
Most Washington homeowners pay zero federal capital gains tax on a primary residence sale because Section 121 excludes up to $250,000 single / $500,000 married of gain. Investors do not get that exclusion. The IRS treats a rental as a business asset, not a home, and that single distinction triggers four tax consequences that homeowners never see.
1. No Section 121 exclusion unless the property was your primary residence for at least 2 of the prior 5 years (and even then, only partially). 2. Depreciation recapture at 25% on every dollar of depreciation deduction you took (or were allowed to take) over the holding period. 3. NIIT exposure at 3.8% on the gain if MAGI exceeds the thresholds. 4. Passive activity rules under IRC §469 that affect how prior-year losses interact with current gain.
Our companion guide capital gains tax when selling a house in Washington covers the primary-residence side in detail; this post is the investment-property mirror.
The Three Federal Taxes a Washington Investor Faces on a Rental Sale
The visual is what trips up most first-time sellers. Recapture is the biggest single bite — bigger than the ordinary long-term capital gains rate — and it applies to dollars that never appeared in your bank account as appreciation. It is purely a tax on prior-year deductions that reduced your rental income.
Step 1 — Calculate Your Adjusted Basis Before Anything Else
You cannot calculate gain without an accurate adjusted basis. The IRS defines adjusted basis (IRC §1011 and §1016) as your original cost plus capital improvements minus depreciation allowed or allowable. Get this number wrong and every other figure in this guide is wrong.
The Basis Formula
A Real Seattle Example
A Capitol Hill duplex purchased in 2010 for $480,000 with $12,000 in closing costs and $85,000 in capital improvements over 15 years. The investor took straight-line MACRS depreciation on the building portion (roughly $360,000 of the basis allocated to building, the rest to land):
| Basis Component | Amount | |----------------|--------| | Purchase price | $480,000 | | Capitalized closing costs | $12,000 | | Capital improvements (15 years) | $85,000 | | Subtotal | $577,000 | | Less: Depreciation allowed (15 yrs × $13,090/yr) | ($196,350) | | Adjusted basis at sale | $380,650 |
Sale in 2026 for $1,050,000 with $63,000 in selling costs (commissions, REET, escrow, title). Amount realized: $987,000. Total gain: $606,350.
That $606,350 gain splits into two components for tax purposes — and they are taxed at different rates.
Splitting the Gain into Recapture vs Appreciation
| Gain Component | Calculation | Amount | Federal Tax Rate | |----------------|-------------|--------|------------------| | Unrecaptured §1250 gain (recapture) | Depreciation taken | $196,350 | Flat 25% | | Long-term capital gain (appreciation) | Total gain less recapture | $410,000 | 15% or 20% | | Net Investment Income Tax (if MAGI > threshold) | 3.8% × total gain | $23,041 | 3.8% surtax |
Pro Tip: Recapture is calculated on the lesser of total depreciation or actual gain. If you sold at a loss, you do not owe recapture. If your gain is smaller than your accumulated depreciation, recapture is capped at the gain.
Step 2 — Decide Between 1031, Cash Sale, or Conversion
The biggest tax decision is not how to calculate the bill — it is whether to pay it at all. Washington investors have four realistic exit paths in 2026, and the choice depends on your reinvestment plans, your liquidity needs, and how much you trust your ability to hit the 1031 deadlines.
Path A — Pay the Tax, Take the Cash
You sell the property, pay federal capital gains tax, depreciation recapture, NIIT if applicable, and walk away with after-tax cash. No reinvestment requirement, no deadlines, no Qualified Intermediary fees. The downside is you give up roughly 22% to 35% of the gain to the IRS depending on bracket and recapture mix.
This is the right path when you want out of real estate entirely, when you need the cash for non-real-estate purposes, when you are in a low income year that minimizes the rate, or when the property is in such poor condition that a cash sale is the only realistic option. The cash buyer vs iBuyer vs Realtor in Washington comparison covers the buyer-type tradeoffs for this path.
Path B — 1031 Like-Kind Exchange
You defer 100% of the federal capital gains tax and depreciation recapture by reinvesting the proceeds into like-kind investment real estate. The deferral is indefinite — you can roll a 1031 into another 1031 into another 1031 across decades. Heirs eventually get a stepped-up basis under IRC §1014, which wipes out the deferred gain entirely at death.
The 1031 has hard procedural rules under IRC §1031 and Treasury Regulations §1.1031:
1. Like-kind requirement. Real estate for real estate. Any investment or business-use real estate qualifies — a Seattle duplex can be exchanged into a Spokane warehouse, raw land, or a fractional interest in a Delaware Statutory Trust. 2. Qualified Intermediary required. You cannot touch the sale proceeds. A QI holds the funds between sale and purchase. Pick the QI before closing on the relinquished property. 3. 45-day identification deadline. Within 45 calendar days of closing on the sale, you must identify in writing up to three replacement candidates (or more under the 200% rule). 4. 180-day closing deadline. You must close on a replacement property within 180 calendar days of the sale, or by the due date of your tax return (including extensions), whichever is earlier. 5. Equal-or-greater value rule. The replacement property must have equal or greater value, equal or greater equity, and equal or greater debt to fully defer the gain. Coming in below any of these creates "boot" that is taxable.
1031 Exchange Timeline
Pro Tip: The 45-day deadline is the killer. There are no extensions, no exceptions for natural disasters or financing delays except the rare federally declared disaster relief notice. Have replacement candidates lined up before you close on the sale, not after.
Path C — Convert to Primary Residence (Partial Section 121)
If you move into the rental and live there as your primary residence for at least 2 of the 5 years before sale, you can claim a partial Section 121 exclusion under IRC §121(d)(6). The exclusion is prorated based on the ratio of "qualified use" (primary residence) to "non-qualified use" (rental) periods after January 1, 2009.
Critically, Section 121 does not exempt depreciation recapture. All depreciation taken after May 6, 1997 is fully recaptured at 25% regardless of how long you lived in the home. The conversion strategy mainly helps with the appreciation portion of gain, not the recapture portion.
A Washington investor who rented a Seattle home from 2014 to 2022, then lived in it as primary residence from 2022 to 2026 (4 years), would calculate the qualified-use ratio as 4 years qualified ÷ 12 years total = 33% of the standard exclusion applied to the appreciation portion. Depreciation taken during the rental years is fully recaptured.
Path D — Qualified Opportunity Zone Investment
Under IRC §1400Z-2, you can defer capital gains by investing the gain (not the full sale proceeds) into a Qualified Opportunity Fund within 180 days of the sale. Deferred gain is recognized on the earlier of the sale of the QOF investment or December 31, 2026. Holding the QOF investment for at least 5 years before December 31, 2026 excludes 10% of the deferred gain permanently. Holding for 10 years steps up basis in the QOF investment to fair market value, excluding all post-investment appreciation.
QOZ deferral is most useful for investors who want to redeploy gain into new development projects rather than 1031-eligible like-kind real estate, or who missed the 1031 deadlines.
Step 3 — Pick the Right Path for Your Situation
The four paths sort along three dimensions: how much you want to defer, how much liquidity you need, and how much complexity you can manage.
Decision Matrix — Which Path Saves the Most Tax
| Scenario | Best Path | Why | |----------|-----------|-----| | Reinvesting all proceeds into another rental | 1031 exchange | Defers 100% of federal cap gains + recapture | | Want to retire and exit real estate entirely | Pay tax, take cash | Locks in current 15%/20% rates; no future deadlines | | Plan to move into the rental long-term | Convert to primary, partial §121 | Partial exclusion on appreciation portion | | Rental in poor condition, no time for 1031 | Pay tax via cash sale | Closes in 7-14 days, no rehab needed | | Want to redeploy gain into development projects | Qualified Opportunity Zone fund | Defers gain until Dec 31, 2026 + 10% exclusion at 5 years | | Heirs will inherit, owner is in late 70s+ | Hold, let basis step up at death | Wipes out 100% of federal capital gains forever | | Owner-financed sale to family or partner | Installment sale (IRC §453) | Spreads gain across years, may keep brackets lower |
Step 4 — Run Real Washington Numbers Before You Decide
Generic frameworks are useless without numbers. Here is the same $1,050,000 Capitol Hill duplex from Step 1, run across four exit paths to show what each one actually costs.
Side-by-Side Tax Math — $1,050,000 Seattle Rental Sale
Adjusted basis: $380,650. Total gain: $606,350. Married filing jointly with $310,000 of other taxable income (places them in the 20% LTCG bracket and triggers NIIT).
Detailed Path Comparison
| Tax Component | Cash Sale | 1031 Exchange | Convert + §121 (4yr) | QOZ Investment | |---------------|-----------|---------------|---------------------|----------------| | LTCG on appreciation ($410,000) | $82,000 (20%) | $0 (deferred) | $54,940 (33% excluded) | $0 (deferred to 2026) | | §1250 recapture ($196,350) | $49,088 (25%) | $0 (deferred) | $49,088 (no exclusion) | $0 (deferred) | | NIIT 3.8% on net inv income | $23,041 | $0 | $14,977 | $0 (deferred) | | WA REET (on $1.05M, illustrative) | $25,470 | $25,470 | $25,470 | $25,470 | | Federal tax owed at sale | $154,129 | $0 | $118,005 | $0 | | Effective federal rate on gain | 25.4% | 0% | 19.5% | 0% |
The dollar swings are enormous. A 1031 exchange on this property defers $154,129 of federal tax. Even a partial Section 121 from a 4-year conversion only saves about $36,000 — and only on the appreciation portion. The Qualified Opportunity Zone path defers everything but ties up the gain in a QOF investment until at least December 31, 2026.
What the Numbers Do Not Show
A deferred 1031 tax bill is not "saved" — it is "owed later." If the next property is sold without another 1031, the original gain becomes taxable at then-current rates. Qualified Intermediary fees run $1,000 to $3,000, and roughly 7% to 10% of attempted 1031s fail because the seller misses the 45 or 180-day deadlines — at which point the full original gain is recognized retroactively.
Step 5 — When a Cash Sale Beats a 1031 (Even With the Tax Hit)
Cash sales make sense for investors who do not want to redeploy into more real estate. They also make sense in specific Washington scenarios where the 1031 mechanics break down or the property condition forces a quick close.
When Cash Sale Is the Better Move
You can request a free no-obligation cash offer from Northwest Cash Offers on any Washington rental property and use the number as a benchmark against a traditional listing or 1031 exchange. The offer is good for 7 days and there is no commitment.
Step 6 — Don't Confuse REET with Capital Gains Tax
Every Washington investor sale triggers two state-level transfer taxes, neither of which is income tax:
These transfer taxes are deductible against the gain calculation — they reduce amount realized and therefore reduce the federal capital gains tax base. They are not separate income taxes.
Washington REET 2026 Brackets
| Sale Price Tier | State REET Rate | Typical Local Add-On | |-----------------|-----------------|----------------------| | Up to $525,000 | 1.10% | 0.25% to 0.50% | | $525,001 to $1,525,000 | 1.28% | 0.25% to 0.50% | | $1,525,001 to $3,025,000 | 2.75% | 0.25% to 0.50% | | Over $3,025,000 | 3.00% | 0.25% to 0.50% |
On the $1,050,000 Capitol Hill duplex example, total REET runs about $14,200 state plus $3,150 local — roughly $17,350. That figure is already baked into the "selling costs" line of the basis calculation in Step 1.
Step 7 — Watch for the Real Estate Professional Exception to NIIT
If you qualify as a "real estate professional" under IRC §469(c)(7), your rental activities are treated as non-passive — and the 3.8% NIIT generally does not apply to the gain on sale (subject to the material participation test for the specific property).
The real estate professional test has two prongs that must both be met every year:
1. More than 50% of your personal services during the year are in real property trades or businesses in which you materially participate. 2. You perform more than 750 hours in real property trades or businesses during the year.
Married filers may use either spouse's hours. The bar is high — passive investors with day jobs rarely qualify. Full-time landlords, real estate brokers actively managing their own portfolio, and Washington property managers often do. A qualified Washington CPA can run the material participation tests on your specific facts.
A married Washington couple with $400,000 MAGI selling a Tacoma rental for a $200,000 gain owes about $7,600 in NIIT under the default passive classification. If one spouse qualifies as a real estate professional and materially participates in this specific property, the NIIT drops to $0.
Step 8 — Document Everything for the IRS Audit That May Come
Investment property sales are flagged for IRS attention more often than primary residence sales. Three documentation habits protect you: keep depreciation schedules from Day 1 (the IRS recaptures depreciation "allowed or allowable" — if you should have depreciated but did not, recapture still applies), save capital improvement receipts (every roof, HVAC, kitchen remodel, and structural repair adds to basis and reduces gain), and preserve 1031 exchange paperwork for at least 7 years after the replacement property is eventually sold.
Pro Tip: If you have lost prior-year depreciation records, IRS Form 3115 (Application for Change in Accounting Method) lets you "catch up" missed depreciation under a §481(a) adjustment — but you must file before the property is sold. Once the sale closes, the catch-up window is gone.
Frequently Asked Questions
How much capital gains tax do I pay on an investment property sale in Washington?
A Washington investor selling a rental property pays federal long-term capital gains tax at 0%, 15%, or 20% on the appreciation portion of gain, plus a flat 25% federal tax on the depreciation recapture portion under IRC §1250. High-income filers also pay the 3.8% NIIT. Washington's 7% state capital gains tax does not apply to real estate. A typical Seattle rental with a $300,000 gain after 15 years of depreciation owes roughly $60,000 to $95,000 in combined federal tax — which is why 1031 exchanges are so common.
Can I do a 1031 exchange on a Washington rental property?
Yes. The 1031 like-kind exchange is fully available for Washington investment real estate. Identify replacement property within 45 days, close within 180 days, and use a Qualified Intermediary. The exchange defers 100% of federal capital gains and recapture indefinitely. Washington has no state add-back because there is no state income tax on real estate gains.
What is depreciation recapture on a Washington rental property?
Depreciation recapture under IRC §1250 taxes the depreciation deductions you took (or were allowed to take) at a flat 25% federal rate when you sell. A Washington investor who depreciated $130,000 over 15 years owes up to $32,500 in recapture tax at sale. The recapture applies even to depreciation you forgot to claim — the IRS uses "allowed or allowable."
Does Washington's 7% capital gains tax apply to rental property sales?
No. RCW 82.87.030 excludes real estate from the state's 7% capital gains tax. Washington investors owe federal capital gains and recapture, but zero Washington state capital gains tax. They still owe Washington REET on the gross sale price.
How do I avoid capital gains tax on investment property in Washington?
Five strategies: a 1031 exchange defers everything; converting to primary residence and meeting the 2-of-5 use test claims partial §121; Qualified Opportunity Zone investment defers gain until December 31, 2026; installment sale spreads gain across years; or hold until death so heirs get a stepped-up basis under IRC §1014.
Can I use the Section 121 exclusion on a converted rental property in Washington?
Partial yes. Convert the rental into your primary residence, live there 2 of the 5 years before sale, and claim a partial §121 exclusion under IRC §121(d)(6) proportional to qualified-use years. Depreciation taken after May 6, 1997 is still recaptured at 25% — Section 121 never exempts recapture.
What is the 3.8% NIIT on investment property in Washington?
The Net Investment Income Tax under IRC §1411 is a 3.8% federal surtax on capital gains, rental income, and other investment income for taxpayers with MAGI above $200K single / $250K married filing jointly. Real estate professionals who materially participate in their rentals can sometimes avoid NIIT entirely under IRC §469(c)(7).
How Northwest Cash Offers Helps Washington Investors
Most Washington landlords looking at a rental sale want a clear comparison between a traditional listing, a 1031 exchange, and a direct cash sale. Northwest Cash Offers makes the cash-sale leg of that comparison concrete. We buy tenant-occupied rentals, distressed properties, inherited rentals, and out-of-state-owned investment properties across King, Pierce, Snohomish, Thurston, Whatcom, and Spokane counties.
Request a free no-obligation cash offer on your Washington investment property. Use the number alongside your CPA's tax projections and a real estate broker's listing estimate — the more data points you have, the better the decision.
This guide is general education only. Every rental sale has tax facts specific to your basis, holding period, depreciation history, and filing situation. Before signing a purchase and sale agreement, opening a 1031 exchange, or accepting a cash offer, talk to a Washington-licensed CPA who handles investor returns.