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This year I am reusing the old soil but putting 30-50% new soil on top and I will have to fertilize since I am sure there isn't much left in the old soil.
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Best not to layer soils. You end up with water tables and drainage issues. Next year dump the old soil out on a tarp and mix the 30-50% new stuff in with it very well then refill the pot.
As to fertilizer, if you will be using a water soluble one or one of the many liquids, no problem. Just be sure to use it regularly every 7-10 days. But if you want to use a granular then top water the pots and make a 2-3" deep trench in the soil all around the pot about 3" out from the base of the plant. Fill the trench with the fertilizer and cover with soil. That way you are feeding every time you water. Mid-season add more to the trench.
Dave