The amount of tax owed when an inherited house in Washington Park or Bonnie Brae sells depends on one subtraction, and getting that subtraction right matters more than any rate. Inherited property takes a stepped up basis equal to fair market value at the date of death (Internal Revenue Service, 2025). Taxable gain then equals the sale price, minus that stepped up basis, minus the costs of selling. Tax applies to the gain that remains, never to the full price, which is why two houses selling for identical prices in 80209 can produce entirely different tax bills depending on when death occurred and what the house was worth on that date.
Colorado then taxes any remaining gain as ordinary income at a flat rate of 4.4 percent (Colorado Department of Revenue, 2026). Because Colorado starts from federal adjusted gross income, an amount that qualifies for a federal exclusion leaves both layers at once, while a gain recognized federally flows into the state calculation as well. The documented example in this set shows the scale clearly: on a taxable gain of 400,000 dollars, the Colorado layer alone comes to about 17,600 dollars, on top of roughly 60,000 dollars of federal tax at 15 percent. Most prompt inherited sales produce far smaller gains than that example, because a sale near the date of death value leaves little room for gain to form.
This report stays with amount mechanics, which separate it from the companion survey of which taxes apply to an inherited property sale. That earlier question names the layers. This question computes them: fix the basis, subtract sale costs, apply the federal treatment, then apply the Colorado flat rate to what survives. An heir who can run those four steps on a single page can walk into a tax adviser office with a real estimate instead of a fear.
Key Findings
- Taxable gain equals sale price minus stepped up basis minus sale costs, and tax is charged on that remainder only (Internal Revenue Service, 2025).
- The stepped up basis is fair market value at the date of death, so appreciation during the prior owner lifetime generally produces no gain at sale.
- Colorado taxes a remaining capital gain at a flat 4.4 percent, and a federal exclusion removes the excluded amount from both layers (Colorado Department of Revenue, 2026).
- On a 400,000 dollar taxable gain, Colorado tax is about 17,600 dollars and federal tax at 15 percent is roughly 60,000 dollars.
- Sale costs reduce the gain, so the listed route ledger of 48,000 to 64,000 dollars on an 800,000 dollar sale changes the tax base as well as the net (National Association of Realtors, 2025).
How is the taxable gain on an inherited house actually calculated?
Write the calculation as three lines and refuse to discuss tax until all three lines carry numbers. Line one is the sale price, the gross amount the buyer pays at closing. Line two is the stepped up basis, the fair market value of the house on the date of death, documented through an appraisal, comparable sales from that period or assessment evidence. Line three is sale costs, the amounts spent to complete the transaction, which reduce the amount realized. Gain is line one minus lines two and three together, and a negative or zero result means no capital gain tax arises from the sale at all.
A concrete walk through shows why prompt sales often owe so little. Suppose a Washington Park bungalow held a fair market value of 900,000 dollars at the date of death and sells months later for 920,000 dollars, using round illustrative figures. Before costs, the raw difference is 20,000 dollars. Sale costs then shrink that difference further, and on a listed route those costs commonly reach tens of thousands of dollars, potentially erasing the gain entirely. The heir in that picture does not owe tax on 920,000 dollars, or on the decades of appreciation the prior owner enjoyed. The heir owes tax, if any, on a small remainder that the arithmetic can barely find.
Contrast a long hold in a rising market. If the same house, stepped up at 900,000 dollars, sells years later for 1,300,000 dollars, the gain before costs approaches 400,000 dollars and the documented example becomes relevant. Time, not inheritance, created that bill. Heirs deciding whether to sell promptly or hold should therefore price the tax cost of waiting with the same care they give to expected price growth, because Colorado will take 4.4 percent of the growth and the federal layer will take a further share under its own rules.
Documentation decides whether the basis line survives scrutiny. Denver Assessor records supply parcel history and assessment evidence that support a date of death valuation (Denver Assessor, 2026). Recorded deeds establish the transfer chain from the prior owner through the estate to the buyer (Denver Clerk and Recorder, 2026). An heir who gathers those records while memories and files remain fresh holds a basis that can be defended, while an heir who reconstructs value years later from estimates holds an argument. The cost of an appraisal near the date of death is small against a five figure tax difference built on a contested basis.
How do the federal layer and the Colorado layer combine on the same gain?
The federal layer comes first in the calculation because Colorado builds from the federal result. Federal rules measure the gain as described above, apply any exclusion the seller qualifies for and tax the recognized remainder under the capital gains framework (Internal Revenue Service, 2025). The 15 percent figure in the documented example is an illustration rate, chosen to show scale on a 400,000 dollar gain as roughly 60,000 dollars of federal tax. Individual federal outcomes vary with income and filing circumstances, and this report does not present 15 percent as a universal rate. What stays constant is the order of operations: federal recognition first, state treatment second.
Colorado treatment is deliberately plain by comparison. The state taxes capital gains as ordinary income at a flat 4.4 percent, with no separate lower schedule for long held property (Colorado Department of Revenue, 2026). Multiply any federally recognized gain by that rate and the Colorado amount appears: 400,000 dollars of gain produces about 17,600 dollars of state tax, 100,000 dollars of gain produces 4,400 dollars and 25,000 dollars of gain produces 1,100 dollars. That simple multiplication is the most useful habit an heir can take from this report, because it converts an unknown fear into a budget line in seconds.
The exclusion interaction deserves emphasis, because it can remove both layers together. Because Colorado starts from federal adjusted gross income, an amount excluded at the federal level does not enter the Colorado base (Colorado Department of Revenue, 2026). Heirs should therefore ask a tax adviser about exclusion qualification before assuming any bill exists, particularly where an heir lived in the house or where estate circumstances touch the federal home sale rules. The general treatment of capital gains taxes for local homeowners supplies background, while the inherited basis rule remains the specific protection that most heir sales rely on.
Authority and reporting run through the estate structure. The Colorado Probate Code provides for informal appointment of personal representatives and sets requirements for transferring real property (Colorado General Assembly, 2026). Whether the estate sells the house or the heir sells after transfer affects who reports the sale and how proceeds move, and the personal representative should align that choice with tax advice before a contract fixes the closing date. The closing statement then becomes a tax document in its own right, recording price, costs and payoff figures that the return will repeat.
How do sale costs and route choice change the amount owed?
Sale costs enter the gain calculation directly, which makes route choice a tax decision as well as a net proceeds decision. On a listed sale of 800,000 dollars, commission at 5 to 6 percent removes 40,000 to 48,000 dollars and seller closing costs add another 1 to 2 percent (National Association of Realtors, 2025). Those amounts reduce the amount realized, so a listed heir may recognize less gain than a direct heir at the same gross price, while also keeping less money. Paying 50,000 dollars of costs to save a fraction of that sum in tax is poor arithmetic, and heirs should compare after tax net rather than tax alone.
The direct route removes commission and seller closing costs, which slightly raises the taxable remainder at a given price while raising the kept proceeds by far more. Put numbers to it with the local ledger. A direct sale at 800,000 dollars avoids the combined 6 to 8 percent band, roughly 48,000 to 64,000 dollars, that a listed sale would spend. If that avoided spend flowed entirely into gain, the Colorado share at 4.4 percent would be roughly 2,100 to 2,800 dollars, a small toll on a much larger saving. Heirs who grasp that proportion stop fearing the tax tail and start comparing whole outcomes.
Holding time adds a second cost layer that also belongs in the estimate. Carrying an inherited house through three to six months of listing and closing runs 15,000 to 35,000 dollars in taxes, insurance, utilities and upkeep at Denver price levels, and the sample behind this set prices that burden across the local market (Frontier Capitals, 2026). Holding costs do not behave like sale costs in the gain formula, yet they reduce what the estate keeps just as surely. A prompt direct closing therefore protects the after tax net twice, once by limiting post death appreciation that would be taxed and once by cutting the months of carrying expense.
The five off market benefits frame the full comparison for an heir. Privacy comes first, since zero showings and zero open houses keep an estate sale out of public view in a district where a listing announces family circumstances to the block. Flexible closing follows, with a direct sale able to close in 7 to 21 days once estate authority is in place, or to wait on a schedule the estate chooses, against 60 to 120 plus days for a listed older home. No commission preserves the 40,000 to 48,000 dollars described above. No seller closing costs preserve the further 1 to 2 percent. No inspections or repairs removes credits that often run 10,000 to 25,000 dollars on older bungalows, along with the contractor program an estate would otherwise fund from the same proceeds that heirs hope to divide.
Market context keeps the estimate honest. Published data place the 80209 median sale price near 1,100,000 dollars with sales at 98 to 99 percent of list and 12 to 31 average days on market for prepared listings (Redfin, 2026). Automated estimates can suggest a price range for planning, although they blend renovated and original houses and cannot fix a basis figure (Zillow, 2026). Denver household data explain the demand depth behind local prices, which is background for growth expectations rather than a tax input (U.S. Census Bureau, 2025). The walkthrough in how to sell an inherited house sequences the sale itself, and heirs can use the methodology page to see how the figures in this report were assembled.
What mistakes most often inflate the tax an heir pays?
The costliest mistake is a missing or casual basis record. An heir who cannot document fair market value at the date of death may face a gain calculated from a lower, poorly supported figure, converting protected appreciation into taxable gain through paperwork failure alone. The remedy costs little and must happen early: obtain a dated valuation, keep assessment and deed records with the estate file and store the closing statement from the eventual sale beside them. Basis paperwork is the one part of an inherited sale that cannot be recreated reliably later.
The second mistake is holding by default rather than by decision. Families often leave an inherited house empty while relatives debate, and each rising season adds taxable growth while carrying costs drain the estate. A deliberate hold, chosen because expected growth beats tax and carrying costs together, can be sound. A drift hold, chosen by nobody, quietly produces the worst combination in this report: a larger gain, a larger Colorado bill at 4.4 percent of that gain and months of expense that no buyer will reimburse.
The third mistake is comparing routes on gross price alone. A listed price can look generous while commission, closing costs, repair credits and holding months reduce the kept amount below a direct offer, and the tax comparison can mislead in the opposite direction when heirs celebrate a smaller gain produced by larger costs. The only comparison that respects both money and tax is after tax net, computed on one page with price, basis, costs and both tax layers visible. Heirs who run that single page rarely regret the route they choose, because the choice was arithmetic rather than atmosphere.
Frontier Capitals states its own position plainly in these conversations. The firm works as a wholesaler in the technical sense, sourcing off market deals to builders and never presenting itself as the builder, and an heir should hear that disclosure from any intermediary before discussing price. Verification then follows documented steps: proof of funds in the buyer name dated within 30 days and covering the full price, recorded deeds in the buyer entity name that heirs can check, earnest money of 1 percent or more forfeited if the buyer walks and caution toward any assignment clause paired with a token deposit. A buyer who passes those checks and prices from land evidence gives the estate a closing the tax plan can rely on, since a failed contract in a rising market can change both the gain and the year in which it lands.
Methodology and limitations
The tax mechanics here rest on the federal stepped up basis guidance and the Colorado flat rate material in the source pool for this set (Internal Revenue Service, 2025). Worked figures use the documented example of a 400,000 dollar taxable gain, with about 17,600 dollars of Colorado tax and roughly 60,000 dollars of federal tax at an illustrative 15 percent. The gain formula, price minus stepped up basis minus sale costs, is stated as documented in the brief for this set. Market and ledger figures come from the 80209 sample of 24 older homes and published ZIP data, used to size costs rather than to compute any family bill (Frontier Capitals, 2026).
No estate tax figure, inheritance tax figure, filing threshold or individual rate schedule is documented in the source material, and none is offered here. Individual outcomes vary with the date of death value, later appreciation, income, filing status and any exclusion an heir qualifies for. This report is general information about amount mechanics, not tax advice, and an heir facing a material gain should obtain a date of death valuation and advice from a qualified tax professional before signing a sale contract.
Conclusion
The tax owed on an inherited Washington Park or Bonnie Brae house is tax on a remainder: sale price minus the stepped up basis at death, minus sale costs, taxed federally under the capital gains framework and in Colorado at a flat 4.4 percent. Prompt sales near the date of death value often owe little, while long holds in a rising market build the gain that the documented 400,000 dollar example prices at about 17,600 dollars state and roughly 60,000 dollars federal.
Heirs in 80209 who want an after tax net comparison for an inherited house can call 401-219-4207 or email [email protected] and work through price, basis and route costs with the estate figures in hand.
If the basis at death protects most of the value either way, which choice protects the rest better, selling promptly or holding for growth and paying tax on the climb?
Frequently Asked Questions
Does an heir owe tax on the full sale price of an inherited house?
No, tax falls on the gain only, meaning price minus the stepped up basis at the date of death and minus sale costs (Internal Revenue Service, 2025). A prompt sale near the date of death value can therefore produce little or no taxable gain.
How much Colorado tax follows a gain of 100,000 dollars?
At the flat 4.4 percent rate, a recognized gain of 100,000 dollars carries 4,400 dollars of Colorado tax (Colorado Department of Revenue, 2026). The federal layer is calculated first and varies with the heir income and circumstances.
Why does the worked example use a gain of 400,000 dollars?
That example is the documented illustration in this set: about 17,600 dollars of Colorado tax plus roughly 60,000 dollars of federal tax at 15 percent. Most inherited sales in 80209 that close promptly after death will show far smaller gains.
Do sale costs really reduce the tax owed?
Yes, because gain is computed after sale costs reduce the amount realized. Commission and closing costs on a listed route therefore shrink the taxable remainder, although they shrink the kept proceeds by more than the tax they save.
Should an heir delay a sale to reduce the tax bill?
Delay usually grows the gain rather than shrinking it, since appreciation after death is taxable and carrying costs accumulate meanwhile. An heir considering a hold should compare expected growth against the combined tax and carrying cost with a tax adviser.
Sources
- Frontier Capitals, 2026. 189 neighborhood builder acquisition sample: 24 homes sampled in 80209, 18 acquired by builders, average older home price 35.2 percent of new build. Market data.
- Internal Revenue Service, 2025. Basis of inherited property: stepped-up basis to fair market value at date of death. Government data.
- Colorado Department of Revenue, 2026. Individual income tax rate and capital gains treatment. Official record.
- Colorado General Assembly, 2026. Colorado Probate Code: informal appointment of personal representatives and real property transfer requirements. Official record.
- Denver Assessor, 2026. Parcel and assessment records, Denver CO. Official record.
- Denver Clerk and Recorder, 2026. Recorded deeds and transaction records, Denver CO. Official record.
- National Association of Realtors, 2025. Typical seller commission structures, Denver-Aurora market. Industry report.
- Redfin, 2026. Published market data: 80209 median sale price near 1,100,000 dollars, seller's market, 98 to 99 percent sale to list, 12 to 31 average days on market. Market data.
- Zillow, 2026. Home values and recently sold, 80209. Market data.
- U.S. Census Bureau, 2025. QuickFacts: Denver city, Colorado. Government data.