S-Corp – Pen to Paper Preparation of Form 1120-S and Related Forms

Date: Aug 12, 2026

Time: 1:00 PM ET | 12:00 PM CT | 10:00 AM PT

Speaker: Jason Dinesen

Description 

Moving from a corporate trial balance to a perfectly reconciled IRS Form 1120-S can be a daunting, error-prone task. Without a clear framework, matching operational book data to the rigid pages of an S-Corporation return often leads to costly math errors, mismatched K-1s, and unexpected IRS notices.

Whether you are a tax professional wanting to understand the underlying mechanics beneath your tax software, or an ambitious business owner preparing your own return, this deep-dive webinar removes the guesswork. We will go "pen-to-paper," stripping away automated software shortcuts to look at the exact mechanics of Form 1120-S.You will learn exactly how to map a profit and loss statement to Page 1, handle complex pass-through items on Schedule K, balance the books on Schedule L, and confidently execute tricky M-1 and M-2 reconciliations.

Learning Objectives:

  • Discuss the latest filing requirements for Form 7203 and identify errors on the form.
  • Utilize a sample Form 7203 with detailed calculations for both stock and loan basis.
  • Discuss the tax preparer's strict obligations and compliance responsibilities for filing Form 7203 for S Corp shareholders.
  • Explain potential exposure issues with Form 7203, including how to uncover and correct substantial COVID-19 relief basis errors.
  • Prepare Form 7203 correctly by following the IRS instructions for each section.
  • Exactly how to translate your trial balance, P&L, and balance sheet onto Page 1 and Schedule L.
  • Apply the basis ordering rules for losses, deductions, and distributions.
  • Report carryover losses and other deductions limited by shareholder basis.
  • Reconstruct shareholder basis when historical records are incomplete or inaccurate.
  • How to correctly report W-2 officer compensation vs. regular employee wages to meet IRS scrutiny.
  • The exact formulas to flow collective corporate income, deductions, and credits seamlessly down to individual shareholder K-1s.
  • Step-by-step guidance on Schedule M-1 (book-to-tax adjustments) and Schedule M-2 (tracking the Accumulated Adjustments Account for tax-free distributions).
  • When you must trigger and attach Form 1125-A, Form 1125-E, and Form 4562.
  • Understand the tax preparer's responsibilities and potential exposure when preparing Form 7203.

A live Q&A session will be held after the event.

This course will reflect the most current regulations and guidance. Any updates or changes to relevant laws or requirements will be fully incorporated into the content to ensure accuracy and compliance.

Who Should Attend:

  • CPAs, EAs, tax return preparers, accountants, and tax professionals

SPEAKER

Jason Dinesen (EA, LPA) is a tax nerd, entrepreneur, tax expert and a well-known presenter of continuing education courses. Known for his sharp tax interpretations, he is one of the quickest to bring the analysis of the latest tax updates and IRS guidance to the professional community. Jason has coached over 200,000 accounting, tax, and HR professionals on various topics of accounting, individual taxation, corporate taxation, professional ethics and much more. He has presented over dozens of webinars on Form 1099 (for 10 years on this subject!); marriage in the tax code; tax updates; the new Form W-4, payroll updates, filing status, tax credits, corporation and partnership taxation and other issues relating to the modern-day setting. Jason always had a knack for speaking and news reporting. He is regularly featured as an anchor for Radio Iowa and Radio Minnesota, is a frequent Podcast Guest and hosts his own Podcast.