"SIS payments follow you" is half the story. Here's the half that actually moves the math.

▸ Step 1 — The federal §453 filter

If §453 doesn't apply, there is no SIS to talk about.

Before the state-sourcing analysis matters, the asset has to actually qualify for installment-sale treatment under IRC §453. A lot of things people think qualify don't:

• Publicly traded stock and securities — explicitly excluded. IRC §453(k) says the installment method "shall not apply to" any sale of stock or securities traded on an established securities market. Entire gain recognized on the trade date.
• Inventory and dealer property — excluded under §453(b)(2) and §453(l).
• Depreciation recapture (§1245 / §1250 ordinary income) — §453(i) requires the entire recapture amount to be recognized in the year of sale, regardless of payment timing. The non-recapture gain can still spread.
• Sales between related parties of depreciable property — §453(g) accelerates gain recognition.

Asset types that do qualify for §453 and where moving out of CA actually matters:

• Privately-held C-corp stock — intangible, qualifies for §453, sourced to seller's residence. Classic SIS use case.
• Privately-held S-corp stock (stock sale, not asset sale) — same treatment as C-corp stock. Cleaner than an asset sale for state sourcing.
• LLC / partnership interests — qualify for §453 on the non-§751 portion. Sourcing nuance below (the hot-asset trap).
• Sale of a business via asset sale — goodwill, customer lists, going-concern value, covenant-not-to-compete payments. Qualifies for §453. State sourcing turns on whether the sale runs through a pass-through entity or is sold directly by the individual. (The Metropoulos trap, below.)
• Real estate — investment, business-use, principal residence over the §121 exclusion — qualifies for §453. State sourcing follows property location, not seller residence.

▸ Step 2 — The state-sourcing analysis

Two questions decide whether California still has a claim on remaining payments.

Question 1: What's the asset's sourcing rule? California taxes nonresidents only on income from California sources. The source rule depends on the asset class:

• Real property — sourced to the location of the property. CA real estate stays CA-source forever, regardless of the seller's residence. FTB Pub 1100, Section F — Real Property.
• Tangible personal property — sourced to where it was located at the time of sale.
• Intangible property (stock, partnership interests, goodwill, IP) — default rule: sourced to the seller's state of residence at the time of payment recognition. FTB Pub 1100, Section G — Intangible Property; Valentino v. FTB (Cal. Ct. App. 2001).

Question 2: Did the gain pass through a pass-through entity (S-corp, LLC, partnership) that operated in California? If yes, the default residence-sourcing rule for intangibles can be overridden by California's apportionment rules. This is where the traps live.

▸ The asset-by-asset map

What actually escapes CA tax when you move — and what doesn't.

What you sold	§453 eligible?	Moving to no-tax state escapes CA on remaining gain?	Why
Privately-held C-corp stock (direct sale by individual)	YES	YES	Intangible. Residence-sourced at payment recognition.
Privately-held S-corp stock (direct sale by individual)	YES	YES	Same as C-corp stock. Intangible, residence-sourced.
S-corp or LLC asset sale of CA business (incl. goodwill)	YES	NO — trap	Apportioned at the entity level to CA. Metropoulos (2022). See trap callout below.
Partnership / LLC interest (no CA real estate inside)	YES (non-hot portion)	PARTIAL	Non-hot intangible portion: residence-sourced. §751 hot-asset portion: apportioned to CA per FTB Legal Ruling 2022-02.
Direct individual asset sale (sole prop, Schedule C, disregarded LLC) — goodwill / customer lists	YES	YES	No pass-through entity sitting between. Intangible, residence-sourced under Valentino line.
California real estate (any kind)	YES	NO	Sourced to property location. CA taxes the remaining gain forever.
Out-of-state real estate (sold while you're a nonresident)	YES	YES	Sourced to property location — not CA. CA never had a claim.
Publicly-traded stock	NO	YES (but not via SIS)	§453(k) excludes publicly-traded securities. Regular sale after move-out works.
Inventory / dealer property	NO	n/a	§453(b)(2) / (l) excludes.
Depreciation recapture portion of any sale	NO (yr-1 recognition)	n/a	§453(i) — recapture recognized immediately, can't be spread.
NQDC paid out over 10+ substantially equal annual installments	n/a (not an SIS)	YES (different statute)	4 USC §114 protects this directly, no SIS needed.
Qualified retirement plan distributions (401k, IRA, pension)	n/a	YES (different statute)	4 USC §114 — only the residence state can tax.
Cryptocurrency, IP royalty streams	TECHNICALLY	DEPENDS	Property under IRS guidance, but assignment companies rarely structure SIS around these. Case-by-case.

▸ The trap most online advice misses

Selling a CA business through an S-corp asset sale doesn't escape CA, no matter where the owner lives.

The partnership-interest "hot asset" trap

Selling a partnership or multi-member LLC interest as a nonresident? FTB issued Legal Ruling 2022-02 in July 2022 splitting the sale into two pieces for state sourcing:

• The non-§751 intangible portion — sourced to your state of residence. (The Valentino rule.)
• The §751 "hot asset" portion (inventory, unrealized receivables, depreciation recapture) — treated as a deemed sale of the underlying assets by the partnership and apportioned to CA based on the partnership's California apportionment factors under Cal. Code Regs. tit. 18, §17951-4(d).

And if the underlying partnership owns California real property, that real-property component follows the property-location rule. So the residence-sourcing benefit applies only to the cleanly intangible portion of the interest. Get the K-1 and a tax attorney on the line before structuring.

▸ Why federal §114 doesn't save an SIS

§114 protects pensions and NQDC — not installment-sale gain.

4 USC §114 (the Pension Source Tax Act of 1996) prohibits states from taxing former residents on certain "retirement income" — qualified plans, IRAs, and a specific subset of NQDC arrangements paid out over 10 or more substantially equal annual installments. It's a powerful tool for executives moving out of a high-tax state.

It does not apply to installment-sale gain under §453. The legislative text is explicit: the protection covers "retirement income" defined as distributions from qualified plans, governmental plans, and specifically-structured NQDC. SIS payments don't fit any of those buckets. If anyone tells you "§114 protects your SIS payments from CA tax after you move" — they're conflating two different statutes. The relief for SIS gain comes from the asset-class sourcing analysis above, not from §114.

▸ Assignment company landscape

MetLife / MACI (domestic) vs Independent Life / Dominion (offshore, longer durations).

For an SIS to work, the buyer's installment payment obligation has to be assigned to a non-related third party — the "assignment company." Two distinct flavors are active in the market:

Both are reputable, regulated structures with clean §453 case law support. The choice between them is a function of duration, rate competitiveness on the case, and whether the seller wants index-linked growth on the deferred annuity portion. See our full breakdown of the assignment-company structure.

▸ The realistic sweet spot

Where SIS + relocation actually moves the needle.

Putting Steps 1 and 2 together, the cases where the move-to-no-tax-state strategy meaningfully improves the SIS math — vs. just being a flat federal-deferral play — are these:

1. Founder selling closely-held company stock. The biggest dollar amounts and the cleanest sourcing analysis. Direct stock sale by the individual, no entity in the middle. Establish bona fide TX/NV/FL/WY/TN/SD/AK residency before payments begin, run the deal through MetLife/MACI or Independent Life/Dominion, watch the CA piece evaporate.
2. Business owner doing a goodwill-heavy asset sale — but only via a structure that avoids Metropoulos. Direct individual sale (no S-corp / LLC in the chain) is ideal. If the entity structure is unavoidable, allocate as much of the purchase price as defensible to goodwill, document the seller's individual ownership of personal goodwill (the Martin Ice Cream framework), and accept that some piece may still apportion to CA. Tax attorney required.
3. LLC / partnership interest sale where the underlying business has no CA real property and minimal CA tangible assets. The intangible portion residence-sources cleanly. Hot-asset portion may still hit CA partially.
4. Out-of-state real estate sale by a CA resident planning to relocate. Easiest case — CA never had a claim, so SIS just defers federal gain over the chosen schedule and your new state (if it has any income tax at all) taxes recognition at its rate.

Note what's missing from this list: CA real estate sales. SIS still works on CA real estate as a federal-deferral tool, but the move-out-of-CA story doesn't apply — CA taxes that gain forever based on property location.

▸ The team you need

A California tax attorney + an SIS broker, working in parallel.

An SIS-plus-relocation strategy isn't a single-discipline problem. Three workstreams have to be coordinated:

• The SIS broker structures the annuity, places it with the right assignment company, drafts the addendum, coordinates with escrow. The broker won't catch residency-planning or entity-structure issues — not their lane.
• The CA tax attorney reviews entity structure, advises on stock-vs-asset-sale negotiation, plans the residency change (bona fide domicile, FTB residency factors, FTB Pub 1031 indicia), documents personal goodwill, models the post-move FTB exposure. The attorney won't structure the annuity — also not their lane.
• Your CPA models the year-by-year cash flow, runs the AMT and NIIT exposures, and files the federal 6252 + CA 3805E once the deal closes.

If any one of these three is missing or working in isolation, the deal either gets structured wrong upfront (the Metropoulos trap, the §751 hot-asset surprise) or the residency planning happens too late (CA can claim domicile through the entire payment year if your move isn't bona-fide before the first payment hits). Get all three at the table before the LOI is signed.