Every state taxes investors differently. Here is how New Jersey treats capital gains at the top rate, the marriage penalty, estate and inheritance tax at death, municipal-bond interest, the §1202 QSBS exclusion, and a harvested loss — a plain reference to the state's tax code.
New Jersey taxes long-term gains at a top effective 10.75%; a state inheritance tax; common-law step-up (only half of jointly-held property).
Non-conforming loss treatment — no carryforward — banked losses never reach the NJ bill. A harvested loss may never reach the state bill. Top effective long-term rate 10.75%.
Joint brackets widen for couples, but by less than 2× — a partial marriage penalty that bites on higher incomes.
State inheritance tax (paid by beneficiaries; the rate depends on the heir's relationship), top rate ~16%. Estate tax repealed 2018; inheritance tax only — Class A exempt, others 11–16%.
Only in-state municipal-bond interest escapes state tax; bonds from other states are taxed. The classic in-state muni preference that rewards a home-state ladder.
Decoupled from IRC §1202 — the state does not follow the federal QSBS exclusion, so gain excluded on the federal return can still be taxed by the state.
No loss carryforward — a capital loss must be used the year it is realized or it is lost, so harvesting only helps against same-year gains (New Jersey has no carryforward — banked losses never reach the NJ bill).
Common-law (separate-property) state: at the first spouse's death only the decedent's half of jointly-held property steps up; the survivor keeps carryover basis on their half (IRC 1014(b)(9), 2040(b)).
Non-conforming loss treatment — no carryforward — banked losses never reach the NJ bill. A harvested loss may never reach the state bill. Top effective long-term rate 10.75%.
State inheritance tax (paid by beneficiaries; the rate depends on the heir's relationship), top rate ~16%. Estate tax repealed 2018; inheritance tax only — Class A exempt, others 11–16%.
Joint brackets widen for couples, but by less than 2× — a partial marriage penalty that bites on higher incomes.
Only in-state municipal-bond interest escapes state tax; bonds from other states are taxed. The classic in-state muni preference that rewards a home-state ladder.
Decoupled from IRC §1202 — the state does not follow the federal QSBS exclusion, so gain excluded on the federal return can still be taxed by the state.
No loss carryforward — a capital loss must be used the year it is realized or it is lost, so harvesting only helps against same-year gains (New Jersey has no carryforward — banked losses never reach the NJ bill).
Coordinating how a portfolio is built and run against New Jersey's rules is worth an estimated ~$45,000/yr for every $1M of taxable assets in our modeling — about +4.5%/yr after tax (a concentrated, naive book keeps ~0.8%/yr vs ~5.4%/yr tax-managed). Your actual figure depends on your holdings — the diagnostic computes it.
Tax law is only half the picture. How a portfolio is built and run — where each holding sits, how losses are used, how gains are timed — decides how much of New Jersey's tax code you actually pay. An illustrative estimate for a portfolio here:
How this is modeled: a single 30-year proxy-spliced path (1996–2026), comparing a concentrated, high-turnover book with a tax-managed one — illustrative and coarse; treat it as directional, not a precise figure.
Five lenses turn New Jersey's tax environment into a household decision — the same lenses every state is read through, so any two states weigh on identical terms.
The state takes 10.75% of every long-term gain at the top — severe drag on what a realized return keeps.
An inheritance tax applies by the heir's relationship, not the estate's size — exposure turns on who inherits, and close heirs are usually exempt.
The rate rewards harvesting, but non-conforming loss rules can strand a banked loss before it reaches the state bill — the timing has to be coordinated.
Both the rate and the estate regime make relocation genuinely valuable — but domicile is a fact pattern, not a mailing address.
Common-law basis: only the decedent's half steps up at the first death — plan titling so the survivor is not left with low-basis lots.
Whether — and how — a change of domicile is worth pursuing, and the facts (days, home, ties) that make it real rather than nominal.
Setting a harvesting cadence that captures the state rate a banked loss offsets, sequenced against the state's loss-carryforward rules.
Placing the high-turnover sleeve in tax-advantaged accounts so the state's rate falls on the least of the household's realized gains.
State law reflects 2025 tax-year law; last reviewed 2026-07-07. Every classification is a summary of state law; where a primary-source citation has been verified, it is linked on the card.