Hello @vd5 ,
Here is a great resource that describes many of the expenses that are considered tax deductions by the IRS. There is little difference between applicable expenses and deductions for an S-Corp or a sole proprietorship.
https://turbotax.intuit.com/tax-tips/small-business-taxes/taking-business-tax-deductions/L5RueYPVS
The one other thing you may want to consider as an S-Corp is paying for employee health benefits and/or retirement benefits.
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