Taxpert Academy · Free Tool

S-Corporation Basis Calculator

Stock basis with §1366 / §1367 / §1368 ordering and suspended-loss carryforward. Multi-year, in-session only.

Tax year
Heads up · Free tool limitation
This calculator tracks stock basis only. Shareholder loans create separate debt basis that can absorb more losses.
Get full debt tracker

Stock basis schedule

Income → distributions → nondeductibles → losses. Per §1367 / §1368 / §1366(d).

Increases
Distributions · §1368
Nondeductibles · §1367(a)(2)
Losses · §1366(d)

Stock basis waterfall

Beginning stock basis
$0
Increases (income, gains, tax-exempt, contributions)§1367(a)(1)
$0
Distributions applied§1368
$0
Nondeductibles§1367(a)(2)
$0
Losses allowed by stock basis (current + carryforward)§1366(d)
$0
Ending stock basis
$0
Free tool · Next step

You calculated the basis. Now learn how to defend it.

This free S Corporation Basis Tracker helps you work through the numbers, but the real advisory skill is knowing what the numbers mean, where they belong on the return, and how to explain them to a client or defend them under review.

Continue Learning

S Corp Basis Masterclass

  • Master stock basis and debt basis
  • Understand loss limitations and suspended losses
  • Learn how basis affects distributions
  • Work through Form 7203
  • Practice with a real basis reconstruction case study
Enroll in the S Corp Basis Masterclass →
Upgrade the Tool

Ultimate Entity Basis Guide

  • 100+ page ebook with deep explanations
  • Practice problems and step-by-step walkthroughs
  • Client communication templates
  • Full debt-basis tracker with auto roll-forward
  • Track S corporations, partnerships, and C corporations
Get the Ultimate Entity Basis Guide →

The free tracker resets when the app closes. The full platform is built for persistent client workpapers and multi-entity basis tracking.

“Taxpert Academy teaches tax professionals to stop thinking like preparers and start thinking like advisors.”

Disclaimer. Taxpert Academy basis tools are a professional reference, not tax advice. Verify all computations against source documents and current law before filing. This free tool is in-session only and saves nothing.

© 2026 Taxpert Academy. Code sections (§1366, §1367, §1368, §465, §469) reference the Internal Revenue Code.