Week 2: S Corporation Revenue, Expenses, and Bookkeeping

This week focuses on the connection between bookkeeping and tax preparation. A clean Form 1120-S begins with accurate business records.

Learning Objectives

  • Separate business income from nonbusiness deposits.
  • Distinguish deductible business expenses from personal expenses.
  • Understand why owner distributions are not ordinary business expenses.
  • Connect bookkeeping categories to Form 1120-S.

Primary IRS Materials

  • Instructions for Form 1120-S
  • IRS guidance on deducting business expenses
  • Publication 334, Tax Guide for Small Business, where relevant

Ordinary and Necessary Expenses

A business expense generally needs to be ordinary and necessary for the trade or business. For a small service business, possible expenses may include software, web hosting, domain registrations, advertising, professional fees, office supplies, business insurance, and qualifying equipment costs.

Do Not Mix These Categories

  • Business expense: A qualifying cost incurred for the business.
  • Personal expense: A personal cost that is generally not deductible by the corporation.
  • Shareholder distribution: Cash or property transferred to the shareholder in the shareholder’s ownership capacity.
  • Payroll: Compensation paid to an employee, including a shareholder-employee.
  • Reimbursement: Payment to an employee or shareholder for qualifying business expenses under an appropriate reimbursement arrangement.

Practice Exercise

Create a fictional S corporation with $20,000 of annual revenue. Categorize 20 sample transactions into revenue, payroll, business expense, shareholder distribution, reimbursement, or personal expense.

End-of-Week Goal

You should be able to look at a transaction and explain not only how you would categorize it in the books, but also why that classification matters for the tax return.

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