Not which state is better — the wrong question. This instrument weighs both environments on the same five decision lenses and shows which coordination priorities change when the environment does. Same reasoning every state is read through; here, side by side.
Each lens turns a tax environment into a household decision. A dashed row means the two environments read the same on that lens; a solid row means they differ.
The household's operating-system domains each environment opens. The middle column holds where they agree; the outer columns are what is unique to each.
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.
Whether the state's estate exposure warrants credit-shelter / QTIP titling or lifetime gifting to move value below the state threshold.
| Dimension | New Jersey | New York |
|---|---|---|
| Capital-gains rate | 10.75%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%. | 10.9%Loss treatment conforms to federal: capital losses net against gains and carry forward. Top effective long-term rate 10.9%. Quirk: + NYC ~3.88% (~14.8% combined); flat-on-all-income recapture. · N.Y. Tax Law §601 (personal income tax on residents) |
| Estate & inheritance | inher.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 Estate tax repealed 2018; inheritance tax only — Class A exempt, others 11–16%. | estateState estate tax (paid by the estate): top rate ~16%, exemption ~$7.16M. A cliff: an estate over 105% of the exemption loses it entirely and the whole estate is taxed; rises to $7.35M for 2026. |
| Basis step-up | 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)). | UDCPRDACommon-law state that has adopted the UDCPRDA — it preserves the community-property character (and the potential full step-up) of assets a couple brought from a CP state. |
| Loss treatment | noneNo 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). | federalCapital losses carry forward under the federal Section 1212 rules — a harvested loss nets against gains and rolls forward until used. |
| QSBS (§1202) | decoupledDecoupled 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. | §1202 okConforms to IRC §1202 — the federal qualified small business stock gain exclusion carries through to the state return. |
Because the rules differ, so does what coordination is worth. On an illustrative 30-year path, running a portfolio against each state's rules is worth an estimated ~$45,000/yr per $1M taxable in New Jersey versus ~$45,000/yr in New York — the coordination gap between the two (about +4.5%/yr vs +4.5%/yr modeled). A hypothetical, illustrative figure; the household's own depends on bracket, holdings, and residency (see the full basis of the estimate below).
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.