Whether the earlier tax judgment concerning the 1928 license agreement collaterally estopped the Commissioner from taxing Sunnen on royalties paid under different license agreements in later tax years.
Holding
No. The earlier judgment did not control royalties arising from separate license contracts that were not litigated in the first proceeding.
Reasoning
Federal income taxes are assessed annually, so each taxable year creates a separate cause of action. A judgment concerning one year is fully res judicata only for that same claim and year; in litigation over a later year, it operates at most as collateral estoppel on issues actually litigated and decided.
Collateral estoppel in a later tax case applies only when the issue is identical in all relevant respects, including the controlling facts and applicable legal rules. It prevents repetitive litigation of a matter that has remained substantially unchanged, not litigation of merely similar questions.
The other royalty contracts were separate instruments from the 1928 agreement considered in the earlier Board proceeding. Even if their terms closely resembled the 1928 contract and presented a similar tax question, a ruling on one contract was not conclusive as to different contracts that were never placed in issue.