The amount that you would enter in the field is the amount that you paid out to the pool that is split among the other employees so in your example it would be 30%. This field is for the tips you received that you did not report to your employer. If all your tips were reported to your employer, do not enter anything in this box. This interview screen is only for tips that were not reported to your employer.
For more information please review the TurboTax article When to Use Tax Form 4137: Tax on Unreported Tip Income.
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