Need to let the IRS know. Probably need to notify state also

Once the IRS has assigned an employer identification number to a partnership, it becomes the permanent federal taxpayer identification number for that business. To close their business account, partnerships need to send the IRS a letter that includes the complete legal name of their business, the EIN, the business address and the reason they wish to close their account. If they have a copy of the notice that the IRS issued with the EIN assignment, they should include that with the letter. They should write to the IRS at: Internal Revenue Service, Cincinnati, Ohio 45999.