Schober v. Commissioner of Revenue, 853 N.W.2d 102

In 2005, the Department of Revenue audited Schober for sales tax not remitted on invoices from his repair/remodeling business, resulting in a notice of change in sales and use tax.
The Commissioner issued a determination on appeal, assessing tax, penalty, and interest for 2000–2005.
Schober appealed to the Minnesota Tax Court, which held he owed the tax and that credits/reimbursements to customers did not absolve remittance obligations.
Our prior decision Schober I affirmed the tax court, ruling refunds could occur only after tax paid to the State and that refunds would not double-tax.
After Schober I, the Commissioner pursued collection; Schober reimbursed some customers.
Schober filed a refund claim and a March 7, 2011 Commissioner letter denying the refund was issued; Schober appealed to the tax court.

Issue	Plaintiff's Argument	Defendant's Argument	Held
Whether the March 7, 2011 letter is an appealable final order	Schober argues the letter is a final order denying a refund.	Commissioner contends no formal order is required; the letter has finality.	Yes, the letter is an appealable final order.
Whether Schober is entitled to a refund for unpaid taxes based on reimbursements	Schober seeks a refund/credit for overpayments tied to reimbursements to customers.	No refund because taxes were not paid to the State; no basis for credit on unpaid taxes.	Refund claim for unpaid taxes is denied.
Whether res judicata bars Schober’s refund/readjudication claim	Schober argues new issue not addressed in Schober I.	Claim seeks readjudication of tax liability, barred by res judicata.	Barred by res judicata.
Whether the denial of the Fourteenth Amendment claim to amend was an abuse of discretion	Schober sought to add constitutional claims after initial proceedings.	Amendment would be futile and prejudicial; barred by res judicata.	No abuse of discretion; amendment denied.

Beuning Family LP v. Cnty. of Stearns, 817 N.W.2d 122 (Minn.2012) (appealability and finality of tax court orders; exhaustion of remedies)
Klein Bancorporation, Inc. v. Comm’r of Revenue, 581 N.W.2d 863 (Minn.App.1998) (refund denials by letters can be final decisions eligible for appeal)
Port of Boston Marine Terminal Ass’n v. Rederiaktiebolaget Transatlantic, 400 U.S. 62 (U.S.1970) (final agency action requires that judicial review not disrupt adjudication; rights determined)