Update 6/30/19: eBay will begin collecting sales tax in the following states on July 1st, 2019:

Alabama

Arkansas

Indiana

Kentucky

New Mexico

Oklahoma

Pennsylvania

Rhode Island

South Dakota

Virginia

West Virginia

Wyoming

Vermont

They will begin collecting sales tax on these states starting October 1st:

California

North Dakota

South Carolina

Texas

Utah

They already collect sales tax in these states:

Minnesota

Washington

Iowa

Connecticut

District of Columbia

Nebraska

New Jersey

For more information, head to the eBay tax page.

Original post: eBay has begun to collect sales tax in Washington & Minnesota as of January 1st, 2019. eBay will also begin collecting sales tax in these other states on the following dates:

Iowa, February 1, 2019

Connecticut, April 1, 2019

New Jersey, May 1, 2019

Alabama, July 1, 2019

Oklahoma, July 1, 2019

Pennsylvania, July 1, 2019

This stems from the supreme court ruling (South Dakota v. Wayfair) regarding internet sales tax. This means that states may now charge tax on purchases made from out-of-state sellers, even if they have no physical presence in that state. I’ll let readers argue the merits of this in the comments, this is really just a note to let people know about eBay collecting these taxes.