It depends. Self employment tax plus income tax equals your estimated payment.
Self employment tax - Medicare and Social Security is 15.3% on 92.35% of your Net Profit greater than $400.
Income tax brackets vary widely. There is no safe percentage. You should make estimated payments in order to have less than $1,000 due the IRS. You can start with a lower percentage and work your way as your income climbs or you can determine your average and set that aside. WI has a pretty big bracket that covers many based on your filing status.
Help with federal and state estimates:
WI DOR Individual Income Tax Estimated Tax Payments
Federal About Form 1040-ES, Estimated Tax for Individuals
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