The withholding tax applies to the withdrawal and is based on the total withdrawals. It is 10% withheld up to $5000, 20% between $5000 and $15000 and 30% above $15000.
Just a word of warning; you can't want say $15k in withdrawals and figure that you will just withdraw $5k three times to avoid the withholding tax. They will treat those as cumulative and withhold greater amounts to make sure that you are having the correct amount withheld.
I think that is the question you're asking, but if I missed the point here, just let me know.
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