S Corp Mistake That Kills Your Tax Write-Offs

Mark J Kohler
Mark J KohlerMar 25, 2026

Why It Matters

Misunderstanding S‑corp basis can delay or eliminate tax deductions, directly reducing cash flow for growing small businesses.

Key Takeaways

  • Loans to an S‑corp don’t generate tax basis.
  • Only capital contributions increase shareholder basis for deductions.
  • Insufficient basis blocks depreciation and loss write‑offs for owners.
  • S‑corp status often reached at $40‑50k revenue annually.
  • Contribute equity, not loans, to preserve tax write‑offs.

Summary

The video warns small‑business owners that a common misunderstanding about “basis” can nullify valuable tax deductions once their LLC elects S‑corporation status, typically after earning $40‑$50k annually.

The speaker explains that only capital contributions—not loans—create shareholder basis in an S corp. Without sufficient basis, depreciation on equipment, vehicle write‑offs, or operating losses cannot be claimed, effectively postponing tax benefits until enough equity is injected.

He illustrates the point with a scenario: an owner finances a new truck through an auto loan, expecting to deduct depreciation, but the loan adds no basis, so the deduction is suspended. He stresses that “you want equity in your business, not loaning yourself,” urging contributors to treat personal funds as capital.

The implication is clear: entrepreneurs must track and fund basis proactively to unlock deductions, avoid cash‑flow surprises, and maintain compliance. Failure to do so can erode profitability and complicate year‑end tax filings.

Original Description

This video clarifies the concept of 'basis' in business finance, specifically for an S corporation. We explain that while loans do not create basis in an S-corp, capital contributions do, impacting your capital account. Understanding this is a vital financial management and tax strategy for any small business owner.
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