Commonwealth Court's 5-to-2 decision Wednesday backed a decision by a city judge in December.
The court majority says the beverage tax, imposed on distributors, doesn't hit the same subject or people as the sales tax.
The two-judge dissent says the ordinance that allows the beverage tax duplicates the sales tax because it can only be imposed "in relation to the retail sale of sugar-sweetened beverages."
If fully passed on to consumers, the tax is $1.44 on a six-pack of 16-ounce bottles.
City officials say the tax has brought in more than $25 million since taking effect in January, but will likely fall short of projected revenues this year.
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