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# Selling a California Home to Buy in Colorado
- URL: https://truenorthboulder.com/guides/moving-to-boulder-county-from-california/
- Published: 2026-08-06T16:00:00.000Z
- Updated: 2026-08-29T04:34:33.000Z
- Description: Two California instruments land on your Colorado closing table. A Colorado team cannot advise on either, but if your Colorado offer is underwritten off your California net, the FTB's own before-close rule decides how much of that net actually arrives. Ask your CPA early.
- Author: Daniel Hsieh
- Tags: Relocation Guide, Relocation, Financing

**Your Colorado budget is not sale price minus payoff.** California requires real estate withholding at closing, computed at **3⅓% of the gross sales price** rather than on your gain. On a $1.6 million sale, a round illustration and not anyone's transaction, that is roughly $53,000 that does not travel with you. It is recoverable, just not in time.

**Selling a California home to buy in Colorado breaks that arithmetic in one specific place.** If your Colorado offer is underwritten off your California net, the withheld amount is a line in your proof of funds. Treat it as a tax question and it lands on your CPA's calendar; treat it as a funding question and it lands on your closing calendar, which is where it bites.

We are a Colorado team with eXp Realty. **We cannot sell, list, price or advise on your California house** — that belongs to a California-licensed broker, and the tax belongs to your CPA. What follows is the Colorado side, and the four places the California side collides with it.

![A five-row timeline titled ‘Two closings, one timeline,’ pairing each dated decision made on the California side of the move with what it sets for the Colorado purchase — from the last use of the house before the listing agreement, through Form 593 at escrow, the written buyer agreement before touring, the inspection deadline that accepts by silence, and the good-funds gap between the two closing dates.](https://storage.ghost.io/c/7c/ec/7cec6ddd-8aeb-4e8c-923a-e353e04b082d/content/images/2026/08/moving-to-boulder-county-from-california-infographic.png) 

**Two closings, one timeline — the order these decisions actually come in.** **(1) Before you sign the California listing agreement:** the last use of the house is sell, hold vacant, or rent. Form 593 excludes a last use as a vacation home, second home or rental, so renting it out ends the principal-residence exemption and 3⅓% of the gross sale price is withheld at closing, computed on the gross price rather than on the gain. Hold it vacant and the exemption survives, but most homeowner policies restrict coverage past roughly 30 to 60 days standing empty. **(2) When the escrow packet opens, not at signing:** Form 593 is in the stack. You certify it, under penalty of perjury; your CPA decides whether you qualify; escrow only receives it. The Franchise Tax Board’s rule is to submit it “before the close of the real estate transaction” — after that, the amount comes back only as a credit on a tax return. **(3) Before you tour anything, including the video walkthrough:** a written buyer agreement has to be signed before a Colorado broker tours you through a house, so the paperwork comes before the first Saturday morning, not after you pick a house. **(4) When you write the offer:** under California’s standard form a contingency stays in place until you remove it in writing. Here, silence accepts — on the inspection termination deadline, the deadline passing is the event. **(5) Closing:** your California closing date sets the Colorado one, because Colorado closes on good funds. California FTB Form 593 and instructions, 2026 taxable year; Colorado Real Estate Commission Contract to Buy and Sell Real Estate (Residential) CBS1, mandatory for use on or after 2026-01-01\. No dollar figure appears on the graphic on purpose: a nonresident’s California tax is computed on an effective-rate basis, so an honest worked example cannot exist on a graphic.

## Selling a California home: the money that doesn't arrive

That withholding is **Form 593**, and it takes **3.33% (3⅓%) of the gross sales price** before anything reaches you. The [Franchise Tax Board](https://www.ftb.ca.gov/pay/withholding/real-estate-withholding.html?ref=truenorthboulder.com) calls it *"a prepayment of income tax"* and states plainly that *"it is not an additional tax on the sale of real estate."* True, and beside the point: a prepayment you cannot spend is indistinguishable from money you do not have.

There is an exemption: a principal-residence certification on Form 593 removes the withholding entirely. Here is the sentence the whole thing turns on, in the FTB's words rather than ours:

> "The seller/transferor must submit [Form 593](https://www.ftb.ca.gov/forms/2026/2026-593-instructions.html?ref=truenorthboulder.com) **before the close of the real estate transaction** to prevent withholding on the transaction. After the real estate transaction has closed, amounts withheld may be recovered only by claiming the withholding as a credit on the appropriate year's tax return."

**So the moment that matters is earlier than you think.** Pull Form 593 out of the opening-escrow package, not out of the signing stack. **You certify it, under penalty of perjury**, and certifying an exemption you do not qualify for carries a penalty of $1,000 or 20% of the required withholding, whichever is greater. Escrow only receives it. So: **your CPA decides whether you qualify, you sign, and the deadline belongs to escrow.** "Ask your CPA" is true and useless at that moment, because your CPA is not in escrow.

The FTB is blunt about who cannot help you: title and escrow persons *"are not authorized to provide legal or accounting advice for purposes of determining withholding amounts."* Neither are we, and we are not even in that room.

Which raises the question of what you write the Colorado offer with while that money is still in California: a sale or settlement contingency, a bridge, or other funds. Those are the [move-up equity guide](https://truenorthboulder.com/guides/move-up-equity-position-boulder/) and the [bridge-versus-contingency guide](https://truenorthboulder.com/guides/bridge-loan-vs-sale-contingency-boulder-county/) — both written for a Colorado sale, so neither carries the withholding line you just read about; subtract it yourself before you use their arithmetic. And even when the California money is real, **Colorado closes on good funds**: a Friday close in California is not a Monday close here, and that gap is a date your broker sets rather than one you discover.

Why we won't compute your number

You want a worked example. So do we, and we are not going to give you one, not for caution but because **an honest one does not exist on a web page.** A nonresident's California tax is computed on an effective-rate basis: California figures the tax as if you were a resident on *all* your income, then applies that rate to the California portion. Which means **income you earn in Colorado can raise the rate California applies to the California gain**, even though California never taxes the Colorado income. Any example that omits that is wrong for essentially every real reader. Take the arithmetic to a CPA licensed where you are selling.

## The one decision you still control

**Do not rent the California house out for the gap months.** Form 593's principal-residence exemption carries an exclusion printed in the instructions: **if the last use of the property was as a vacation home, second home, or rental, you do not qualify.** It is the only variable on this page that is entirely yours.

Hold that against advice you will get from most relocation guides, ours included: rent for three to six months in Colorado before you buy. That advice is right, and it is about *this* side of the move. But you will hear it as *"so don't sell California yet either"*, and renting out the California house for the gap months makes its last use a rental.

**Three branches, and only one of them is free.** Sell before you go and the question never arises. Hold it empty and the exemption survives, but call your carrier first, because most homeowner policies restrict coverage on a house standing vacant past roughly thirty to sixty days. We cover that gap in [owning two homes during a move](https://truenorthboulder.com/guides/owning-two-homes-during-a-move/). Rent it, and the exemption is gone.

**What you do with the California house is decided before you sign the listing agreement, not after.** A house left vacant for the gap and a house rented for the gap are the same house to you and different houses to Form 593.

There is a slower version of the same trap federally: the capital-gains exclusion turns on having lived in the home two of the last five years, and a conversion to rental starts burning that clock. We cover the federal exclusion in our [Colorado capital-gains guide](https://truenorthboulder.com/guides/capital-gains-home-sale-colorado/) rather than re-deriving it here.

## What Colorado doesn't tax, and the basis that ends at the sale

The first thing almost everyone asks is whether Colorado is going to tax this too. It turns on one thing: **whether you were a Colorado resident when the sale closed.** Sell while you are still a California resident and Colorado does not touch it, because it taxes a part-year resident on the resident portion of the year plus Colorado-source income, which it defines for property as *"income from real and tangible personal property located in Colorado."* A California house is neither. Close **after** becoming a Colorado resident and the answer changes shape: residents are taxed on all sources, and it is the credit mechanism rather than an exemption that keeps you from paying twice. Which you are on closing day is a residency and domicile determination, not decided by the date on your moving truck, and it is your CPA's call.

The other California instrument surprises people more. **The property-tax basis that made the California house cheap to hold does not travel, and there is nothing here to receive it.**

California's [base-year value transfer](https://www.boe.ca.gov/pdf/pub801.pdf?ref=truenorthboulder.com) moves a taxable value to a replacement primary residence **anywhere in California**. It is not that the law overlooked other states. It cannot reach them: both the old house and the new one have to qualify for a California property-tax exemption, and the claim gets filed with a California county assessor. A Colorado home does neither. And it ends at the **sale**, not at the move: the base-year value survives as long as the ownership does, wherever you are living.

Colorado has no acquisition-value system at all. Residential property here is valued *"using only the market approach to value,"* from comparable sales on a fixed statewide window. For tax years 2025 and 2026 that means sales which closed between **January 1, 2023 and June 30, 2024**. **Your purchase price does not set your assessed value. It is not even in the dataset.** What that means for your carrying cost is in our [bigger-home guide](https://truenorthboulder.com/guides/is-a-bigger-boulder-home-worth-it/).

## What silence does here

**In Colorado, a deadline passing is itself the event. Nothing has to be delivered.** Under California's standard residential purchase agreement a contingency stays in place until you remove it in writing, so waiting to be told is safe there. That is the habit to unlearn, and it is worth more than any form on this page. Every deadline on that calendar, and what each one waives if it passes, is laid out in our [Colorado contract deadlines guide](https://truenorthboulder.com/guides/colorado-contract-deadlines-boulder/).

Colorado's Contract to Buy and Sell provides that if a notice to terminate is not received on or before the applicable deadline, *"the party with the Right to Terminate accepts the specified matter, document or condition as satisfactory and waives the Right to Terminate under such provision."* **On the inspection termination deadline, silence accepts the house.** Not every deadline runs that way. Object, then go quiet on the resolution deadline, and the contract terminates instead. Which is exactly why the dates are your broker's job to hold.

Behind that sits a second thing set once and never revisited: **what a seller can collect if you default is a checkbox on the offer.** Left unchecked, what you lose is the earnest money and nothing more: the form calls it *"SELLER'S ONLY REMEDY"* and the seller gives up the right to force the sale through. Checked, the seller can keep the deposit **and** *"recover such additional damages as may be proper."* **So that box decides whether your worst case is a number you chose or a number somebody computes afterwards.** Two qualifiers print on the form's own face: the cap is stated *"except as provided in §§ 10.4\. and 21"* (inspection damage and indemnity survive termination, and fees shift to the prevailing party), and the earnest money is owed *"whether or not paid by Buyer."*

**The instruction is not "negotiate it."** The unchecked default is already the buyer-favourable outcome. **Your broker marks that box when they write your offer, so ask which way, and ask why.** Then size your earnest money as the number you can afford to lose rather than as a bidding chip. A larger deposit does not signal strength here so much as raise the ceiling on what walking away costs.

Two fences. This is the **Commission-approved contract you sign on a resale**, and a builder writes its own document in which these protections may simply not appear ([the Berthoud guide](https://truenorthboulder.com/berthoud/living-in-berthoud/) covers builder mechanics). And every one of these dates is written by your broker around your plane ticket.

One structural difference, and it arrives sooner than you expect. **A written buyer agreement has to be in place before a broker tours you through a house, including the live video walkthrough that is usually an out-of-state buyer's first showing.** So the paperwork happens before the first Saturday-morning video call, not after you have picked a house, and compensation under it is negotiable and not set by law. Separately: California permits disclosed dual agency. Colorado has prohibited it since 2003\. A single firm cannot act as agent for both sides of the same transaction. A Colorado broker is either a transaction-broker, a neutral facilitator with different duties, or a single agent for one side, and since August 12, 2026 the broker must establish which one in a written agreement before doing licensed work for you (HB26-1426). Until that date the neutral role arose by default from silence; it no longer does. Our [buyer-agency guide](https://truenorthboulder.com/guides/buyer-agency-agreement-colorado/) has the mechanics.

## What nobody's report will tell you

**There is no Colorado equivalent of the Natural Hazard Disclosure statement.** In California a third party researches the property against flood, fire and seismic maps and hands you a report; if you are selling a California home right now, somebody is preparing yours. Nobody prepares one here, and no Colorado document replaces it. Colorado's seller disclosure is a **knowledge** instrument, not a map. The Commission's form asks the seller to answer to their *"CURRENT ACTUAL KNOWLEDGE"*, and the capitals are the form's, twice on page one. It is expressly *"not a warranty or guarantee of any kind"* and *"not intended as a substitute for an inspection."* A blank means the seller does not know. It does not mean the hazard is not there.

The duty is not limited to the boxes. A known adverse material fact must be disclosed whether the form asks or not. But knowledge is still the trigger.

Radon shows the shape of it inside the one hazard where you would most expect a mandatory report. The contract requires a seller to provide *"any known information on radon test results."* **It does not require the seller to test.** A seller who never tested, and knows nothing, discloses nothing and is entirely compliant. **The burden of discovery sits with your inspection, and that is the whole design.**

One exception runs the other way. Special and metropolitan districts get a mandatory legend printed in the contract regardless of what anyone knows, paired with a tax certificate you can terminate over. Worth knowing before you shop the newer subdivisions.

On insurance, you are almost certainly watching the wrong hazard. **Hail is the underwriting story here.** Roof age and material drive insurability more than anything else on the house, and carriers have moved wind and hail off flat deductibles onto a percentage, commonly one to five percent **of the dwelling coverage limit**. That is not your purchase price, and the order of magnitude surprises people. Two percent of a $900,000 dwelling limit is $18,000 before the carrier pays anything.

If you end up looking at foothills-adjacent stock, buy room on the insurance deadline rather than assuming you can appeal out of a surprise. Colorado [now requires insurers](https://leg.colorado.gov/bills/hb25-1182?ref=truenorthboulder.com) to disclose a wildfire risk score and an appeals path, but that clock does not fit inside a typical contract window. Wildfire and flood geography sit at the [Loveland guide](https://truenorthboulder.com/loveland/moving-to-loveland/); what an inspection here actually turns up is in our [Boulder County inspection guide](https://truenorthboulder.com/guides/home-inspection-boulder-county/).

## The order these actually happen in

**None of this is unusual, and none of it is hard once it is in the right order.** People make this move every month and it goes fine; what goes wrong is almost always sequence, because two of the four items below expire before anyone thinks to look at them.

1. BEFORE YOU LIST IN CALIFORNIA  
Decide what the house does while you are gone  
Vacant keeps the exemption; rented ends it. Ask your CPA before the choice, not after.
2. WHEN THE ESCROW PACKAGE ARRIVES  
Pull Form 593 out of the stack  
Your signature, escrow's deadline, your CPA's judgment. Three people, one form.
3. BEFORE YOU WRITE HERE  
Work out what actually funds the purchase  
Sale price minus payoff minus anything withheld. If that number does not cover cash to close, the question becomes a contingency, a bridge or other funds — which is the [equity-position guide](https://truenorthboulder.com/guides/move-up-equity-position-boulder/) — whose net-sheet assumes a Colorado sale, so subtract anything withheld before you use it.
4. DURING THE SEARCH  
Get insurance quotes, not after acceptance  
Roof age is on the listing and it is most of the application. On foothills stock this is the deadline that surprises people.
5. WHEN THE OFFER IS WRITTEN  
Ask about the remedies checkbox and the dates  
Which way it is marked, why, and whether the inspection and insurance deadlines were built around your flights and your California escrow rather than a template.
6. UNDER CONTRACT  
Your inspection is the hazard report  
Nobody hands you one. Order radon with it, because the seller was never required to test.

Everything above is the California-facing half. For the Colorado-facing half, meaning how offers, contingencies and inspections work here generally, start at the [Boulder County buyer's guide](https://truenorthboulder.com/guides/buying-a-home-in-boulder-county/), and for the town itself, [living in Boulder](https://truenorthboulder.com/boulder/living-in-boulder/). If the move is job-anchored rather than sale-anchored, [what a remote-work move optimises for](https://truenorthboulder.com/guides/remote-worker-moving-to-boulder/) is the better door.

**Two calendars are about to run at once, and only one of them is ours to write.** The California escrow moves when it moves. The Colorado deadlines get set by whoever writes the offer, which means they can be built to survive an escrow we cannot see rather than one we assume closes on time. That is a conversation that belongs ahead of the offer rather than behind it. [It starts with three things](https://truenorthboulder.com/contact/): your California closing date if you have one, the date you need to be here, and what is still undecided.

*True North Boulder is a real estate team with eXp Realty.*

*Nothing here is legal, tax or insurance advice, and nothing here is advice about your California sale, which is governed by California law and belongs with your California broker and your tax advisor.*

Common questions

## Frequently asked

Does California still tax my home sale if I move to Colorado first?+ 

Yes. California taxes gain on California real property based on where the property is located, and the Franchise Tax Board's guidance states that California taxes real property based upon where the property is located. Its published installment-sale example addresses a seller who sold California property and then moved out of state. Moving first does not change it. Whether Colorado also reaches the gain depends on whether you were a Colorado resident when the sale closed, which is a residency and domicile determination for your CPA.

What is the 3 1/3% withholding on a California sale?+ 

California requires real estate withholding at closing, computed on the gross sales price rather than on the gain, at 3.33% (3⅓%). The Franchise Tax Board describes it as a prepayment of income tax and states it is not an additional tax on the sale. An exemption may be certified on Form 593, including a principal-residence exemption. The FTB's instructions state the form must be submitted before the close of the real estate transaction, and that after closing, amounts withheld may be recovered only by claiming the withholding as a credit on the appropriate year's tax return.

Will Colorado tax the gain on the California house too?+ 

It depends on whether you were a Colorado resident when the sale closed. Colorado taxes a part-year resident on income relating to the resident portion of the year plus Colorado-source income, and the Department of Revenue defines Colorado-source income for property as income from real and tangible personal property located in Colorado. A California house is neither. Close after becoming a Colorado resident and the analysis changes shape. Which you are on closing day is a residency and domicile determination, and it belongs with your CPA rather than with a real-estate page.

Can I bring my California property-tax basis to Colorado?+ 

No, and there is nothing here to receive it. California's base-year value transfer moves a taxable value to a replacement primary residence anywhere in California: both the original and the replacement property must be eligible for a California property-tax exemption, and the claim is filed with a California county assessor. A Colorado home qualifies for neither and has no California county assessor, so the mechanism forecloses the state line by construction rather than by oversight. Colorado runs no acquisition-value system at all, which is a different subject and one our guide to whether a bigger Boulder home is worth it covers.

Do Colorado contract deadlines work like California's?+ 

They run the other way. Under California's standard residential purchase agreement a contingency generally stays in place until the buyer removes it in writing. Colorado's Contract to Buy and Sell provides that if a notice to terminate is not received by the applicable deadline, the party with the right to terminate accepts the matter as satisfactory and waives that right. On the inspection termination deadline, silence accepts. Not every deadline runs that way: object, then go silent on the resolution deadline, and the contract terminates instead. Your broker sets those dates when the offer is written, and for an out-of-state buyer they have to accommodate travel.

Sources & data notes 
- California Franchise Tax Board: Publication 1100 (rev. 10/2024) on sourcing; Publication 1016 (rev. 02/2026) and the real estate withholding pages on the prepayment character; Form 593 and its instructions (2026 taxable year) on the 3⅓% rate, the Part III certifications, the false-certificate penalty and the before-close submission requirement. Retrieved 2026-08-01.
- California Board of Equalization: Publication 801 (updated June 2025) on the base-year value transfer and its eligibility criteria; Publication 29 (March 2025) on reassessment occurring only upon a change in ownership or new construction. Retrieved 2026-08-01.
- Colorado Department of Revenue: part-year resident and nonresident guidance, and the credit for tax paid to another state. Colorado Division of Property Taxation: residential valuation by the market approach and the 2025–26 comparable-sales window. Retrieved 2026-08-01.
- Colorado Real Estate Commission: Contract to Buy and Sell Real Estate (Residential), CBS1, adopted 2025-08-05 and mandatory for use on or after 2026-01-01\. The termination, default, remedies, radon and special-district provisions quoted here. Seller's Property Disclosure (Residential), SPD19, same adoption and mandatory-use dates.
- Colorado General Assembly: HB24-1300 (2024) — House Third Reading 2024-04-24, 38 aye, 23 no, 4 other; postponed indefinitely in Senate Local Government & Housing 6–0 on 2024-04-30\. HB25-1182 (2025), creating C.R.S. 10-4-124, effective 2026-07-01, on insurer wildfire risk-score and appeal disclosure.
- The federal capital-gains exclusion and its two-of-five-year test are covered, with sources, in our [Colorado capital-gains guide](https://truenorthboulder.com/guides/capital-gains-home-sale-colorado/). California's standard residential purchase agreement is referenced for its contingency-removal structure, which is a term of that form rather than a statute.
- Figures are illustrative round numbers, not any transaction. Tax rates, form versions and deadlines change; verify the current ones before you act.