A 13% floor, not a gentle ramp-up
The exemption hasn't moved since 2020
Minnesota's $3,000,000 exemption is not indexed for inflation and has stayed exactly there since 2020 — one of the smallest, most static exemptions among the states that still tax estates.
No portability, no separate inheritance tax
Each spouse gets a single $3,000,000 exclusion with no ability to add a deceased spouse's unused amount — see Portability & Marital Deduction for what Minnesota offers instead. Minnesota also has no separate inheritance tax; only the estate itself is taxed.