Quick answer: no portability, but Rhode Island's own QTIP election, confirmed by official ruling, gives married couples a genuine, independent planning tool. Run your own numbers in the Rhode Island estate tax calculator.
One threshold per spouse, no exceptions
Each Rhode Island estate receives one threshold. If the first spouse to die doesn't use all of it, the unused portion is permanently lost — there's no mechanism in R.I. Gen. Laws Chapter 44-22 to carry it forward to the survivor.
A QTIP election Rhode Island confirmed by official ruling
Form RI-706 tracks the federal box separately
The current Form RI-706 includes its own checkbox for whether the estate elected federal Deceased Spouse's Unused Exclusion ("portability") at the federal level — but that federal-level choice has no effect on Rhode Island's own, entirely separate calculation. It's purely informational for Rhode Island purposes.
The standard workaround: bypass trust planning
Because there's no portability, Rhode Island couples typically rely on a credit shelter (bypass) trust, often paired with the state-only QTIP election, to make sure each spouse's own threshold is genuinely used rather than wasted when the first spouse dies.
A local probate attorney can review your estate — many offer a free consultation.
Because Rhode Island's underlying tax computation itself runs through the credit method described in the threshold and rates guide, a Rhode Island attorney or CPA should confirm exactly how a specific QTIP election interacts with the estate's overall calculation.