Legal and professional fees: Commissions to agents, attorney fees, and tax preparation fees go here. You can also put union dues here if the membership is not tied to any one job.
Auto/transportation expenses: Track your mileage to auditions, keep receipts for the bus or subway, and hang on to plane and train ticket info.
Insurance: Any special insurance or bond required because of your work. NOTE: Health insurance is deducted elsewhere, so don't include that here.
Supplies: Shoes, costumes, makeup and office supplies go here.
Other: Postage, cell phone if devoted exclusively to work, fax or photocopy fees, classes, reference materials, subscriptions, and anything else related to getting or performing work. If in doubt, keep the receipt, note what it was for, and ask your tax professional or the IRS.