And I'm asking where the decline was? If tariff revenue in the year before the war was in the $50 million range and the tariff revenue for 1863 was in the $100 million range. If the South did account for most imports and most tariff payments then the revenue should have dropped to near nothing and stayed there.
Tariff revenue for year 1860 was $56.1 with a federal debt of $64.8.
I do not know when the tariff deposits in Southern tariff houses stopped being transferred, nor do I know when Northern merchants stopped paying their tariff deposits on goods (sold South) to the government.
But according to Treasury Dept. data, tariff deposits dropped to $41.5 for calendar year 1861.
For calendar year 1862 and forward, data includes the new variables of raw war material imports, and foreign goods now having to be imported as a substitute for Southern goods no longer available.