Hi, I am a bit stuck as to how this is calculated (I am running a spreadsheet for PI and its great :P)

Import fee calculation is: (Import fee = Base cost * tax rate * 0.5) * number of units to import

Tax rate is 5% == 0.05

I have 2 P3s (540 m3 each) and 1 P2 (3600 m3) to import and basically after the import tax you multiply it by how many units of that p3/p2 there is to import

So ((70,000 * 0.05 * 0.5) * 540) + ((70,000 * 0.05 * 0.5) * 540) + ((9,000 * 0.05 * 0.5) * 3600) = 2,700,000 ISK import tax but I am only charged 1,935,000 ISK!

Can anyone help me as to what I am missing?

Is each unit of product 1 m3? If import/export is based on units rather than volume, this is probably your difference.

Looks to me that P2s (Coolant, Mech Parts, etc) are 1.5m3 each and P3s (Robotics, etc) are 6 m3 each.

I have 2 P3s (540 m3 each) and 1 P2 (3600 m3) to import and basically after the import tax you multiply it by how many units of that p3/p2 there is to import

So ((70,000 * 0.05 * 0.5) * 540) + ((70,000 * 0.05 * 0.5) * 540) + ((9,000 * 0.05 * 0.5) * 3600) = 2,700,000 ISK import tax but I am only charged 1,935,000 ISK!

Also, is there any way to check to see if the tax rate is actually something like 4.75% and being rounded to a whole number in the display? I'm not that familiar with POCO mechanics.

ETA: As far as I can tell, I don't think those numbers are accurate. You might want to double check them.

540 is the number of industrial explosives and ukomi superconductors needed and 3600 is the number of reactive metals needed for one PI installation which has 10 production facilities which is going to run for 9 cycles. To get the volume of, say, industrial explosive you would times the quantity by the volume per unit which is 6 m3 thus 540 * 6m3 = 3240 m3