In theory. In practice, the Northern states only contributed 28% of the export products, and therefore only 28% of the returning imports could be bought from revenue produced by northern exports.
The South was producing ~73% of the exports that were paying for the imports, and at 1/4th of the population of the North, the financial burden of the Tariff was substantially higher on their population than it was on the Northern population.
Nor the Morrill Tariff Act, but this:
Land-Grant College Act of 1862, or Morrill Act, Act of the U.S. Congress (1862) that provided grants of land to states to finance the establishment of colleges specializing in “agriculture and the mechanic arts.” Named for its sponsor, Vermont Congressman Justin Smith Morrill (1810–98), it granted each state 30,000 acres (12,140 hectares) for each of its congressional seats. Funds from the sale of the land were used by some states to establish new schools; other states turned the money over to existing state or private colleges to create schools of agriculture and mechanic arts
My bad, also discussing Morrill act with another participant. If the seven states had not seceded when they did the Morrill Tariff act would have never became law.
Not one of those states were effected by it. I doubt they collected the Morrill tariff rates in Charleston after Jan 1861.