Washington State is Now the Highest Estate Tax State in the Nation: There are quite a Washington State residents who, through a great deal of luck (and often some hard work too) have accumulated substantial wealth through employment at, say, Amazon, Microsoft, Starbucks, Zillow, Expedia, Valve, biogen companies, agriculture, venture capital, real estate, etc. Maybe you've built your own company. If you're in this lucky group and have an estate worth at least $3 million, you should know that as of today, Washington State is the most expensive state in which to die. Most states do not have an estate tax. But for those who do, here are the thresholds, and the estimated STATE (and only State) tax burden for a hypothetical estate of $20 million. Note that this does not include the additional federal estate taxes owed. (Disclaimer: This is not legal or financial advice. This list is summarized from Grok below. I've spot-checked it, but I haven't looked at all states to verify. Always consult your own advisors. This is solely meant to alert you that WA's estate tax is now the highest in the nation, by a significant margin, taking a full 35% of an estate upon death beyond the initial exemption.)