S-Corp Shareholder Basis and Distributions: AAA, OAA, PTI, and the Ordering Rules That Determine Taxability

By Yarik Yarosh, CPA ·September 5, 2026 ·7 min read

Written by Yarik Yarosh, CPA (US & Canada) September 5, 2026 · FL CPA license AC61704 · CPA Ontario

S-Corp shareholder basis is a running ledger that determines two things: how much loss you can deduct, and whether distributions are tax-free. Every dollar of loss that passes through on your K-1 reduces your basis by a dollar, and you cannot deduct losses that would take your basis below zero. Every dollar of distribution you receive reduces your basis by a dollar, and distributions that exceed your basis are taxed as capital gains. Under IRC 1366(d)(1), a shareholder’s deductible loss is limited to the sum of (A) the shareholder’s adjusted basis in their stock, plus (B) the shareholder’s adjusted basis in any debt the corporation owes directly to the shareholder. The critical distinction from partnerships is that S-Corp shareholders get no basis from entity-level debt. A bank loan to the S-Corp, even one the shareholder personally guarantees, does not increase shareholder basis. Only a direct economic outlay from the shareholder to the corporation (a loan from the shareholder’s personal funds, not a back-to-back loan where the shareholder borrows from a bank and re-lends to the S-Corp, per the “at risk” rules) creates debt basis.

✓Key takeaway

S-Corp shareholder basis calculation:

Item	Effect on Stock Basis	Effect on Debt Basis
Initial investment (cash or property)	Increases	N/A
Direct shareholder loan to S-Corp	N/A	Increases
K-1 ordinary income	Increases	N/A (unless stock basis was reduced to zero, then restores debt)
K-1 separately stated income (capital gains, tax-exempt income)	Increases	N/A
K-1 ordinary losses	Decreases (not below zero)	Decreases (after stock basis is zero)
K-1 separately stated losses	Decreases (not below zero)	Decreases (after stock basis is zero)
Non-deductible expenses (IRC 162(e) lobbying, 50% meals)	Decreases	Decreases (after stock basis is zero)
Distributions	Decreases (not below zero)	N/A (distributions do not affect debt basis)
Loan repayment to shareholder	N/A	Decreases
Bank loan to S-Corp (even if guaranteed)	No effect	No effect

Basis adjustment ordering (IRC 1367(a)):

Order	Adjustment	Priority
1	Income items (increase basis first)
2	Non-dividend distributions (reduce basis)
3	Non-deductible, non-capital expenses
4	Deductible losses and deductions

Distribution ordering rules:

S-Corp Type	Distribution Source	Tax Treatment
No prior C-Corp E&P	From stock basis (IRC 1368(b)(1))	Tax-free return of capital
No prior C-Corp E&P	Exceeding stock basis (IRC 1368(b)(2))	Capital gain
Has prior C-Corp E&P	From AAA (IRC 1368(c)(1))	Tax-free return of capital
Has prior C-Corp E&P	From accumulated E&P (IRC 1368(c)(2))	Taxable dividend
Has prior C-Corp E&P	From remaining basis	Tax-free return of capital
Has prior C-Corp E&P	Exceeding all accounts	Capital gain

How do S-Corp basis and distributions actually work?

Hypothetical example

Round numbers. A shareholder invests $100,000 in an S-Corp. Over 5 years:

Year-by-year basis tracking:

Year	Beginning Basis	K-1 Income/(Loss)	Distributions	Non-Deductible	Ending Basis	Loss Suspended
Year 1	$100,000	$50,000	($30,000)	($2,000)	$118,000	$0
Year 2	$118,000	$70,000	($60,000)	($3,000)	$125,000	$0
Year 3	$125,000	($80,000)	($40,000)	($5,000)	$0	$0
Year 4	$0	($60,000)	($10,000)	($2,000)	$0	$60,000
Year 5	$0	$90,000	($20,000)	($1,000)	$9,000	$0

Year 3 detail (basis consumed):

Step	Amount	Running Basis
Beginning basis		$125,000
Add: income items	$0	$125,000
Less: distributions	($40,000)	$85,000
Less: non-deductible expenses	($5,000)	$80,000
Less: deductible losses (limited to remaining basis)	($80,000)	$0
Ending basis		$0
Loss suspended	$0

Year 4 detail (losses exceed basis):

Step	Amount	Running Basis
Beginning basis		$0
Add: income items	$0	$0
Less: distributions ($10,000, but basis is $0)
Distribution taxable as capital gain	$10,000
Less: non-deductible expenses	($2,000)	Cannot reduce below $0
Less: deductible losses ($60,000, but basis is $0)	$0 deducted
Loss suspended (IRC 1366(d)(2))	$60,000
Tax on distribution	$10,000 x 20% = $2,000

Year 5 detail (suspended losses restored):

Step	Amount	Running Basis
Beginning basis		$0
Add: income items	$90,000	$90,000
Less: suspended losses from Year 4	($60,000)	$30,000
Less: distributions	($20,000)	$10,000
Less: non-deductible expenses	($1,000)	$9,000
Ending basis		$9,000

Entity debt vs. shareholder loan basis:

Shareholder A and Shareholder B each own 50% of an S-Corp. The S-Corp borrows $200,000 from a bank. Shareholder A guarantees the loan. Shareholder B lends $100,000 directly to the S-Corp from personal funds.

The S-Corp reports a $300,000 loss:

Item	Shareholder A	Shareholder B
Stock basis	$100,000	$100,000
Debt basis (shareholder loan)	$0	$100,000
Bank loan guarantee	No basis effect	N/A
Total basis	$100,000	$200,000
Share of loss (50%)	$150,000	$150,000
Deductible loss	$100,000 (limited to basis)	$150,000 (within basis)
Suspended loss	$50,000	$0
Tax savings (37%)	$37,000	$55,500

Shareholder B gets $18,500 more in tax savings because the direct shareholder loan created $100,000 of additional basis.

Loss limitation layers (S-Corp):

Layer	IRC Section	What It Limits	Ordering
1. Stock and debt basis	IRC 1366(d)	Total deductible loss limited to stock + debt basis	First (most restrictive for S-Corps)
2. At-risk	IRC 465	Loss limited to amounts economically at risk	Second
3. Passive activity	IRC 469	Passive losses only offset passive income (unless REPS)	Third
4. Excess business loss	IRC 461(l)	$305,000 single / $610,000 MFJ (2025)	Fourth

AAA, OAA, and PTI accounts (S-Corp with prior C-Corp E&P):

Account	What It Tracks	Distribution Effect
AAA (Accumulated Adjustments Account)	Post-S-election income minus losses and distributions	Distributions from AAA = tax-free (return of S-Corp earnings)
AE&P (Accumulated Earnings & Profits)	Pre-S-election C-Corp earnings that were never distributed	Distributions from AE&P = taxable dividend
OAA (Other Adjustments Account)	Tax-exempt income and related expenses	Distributions from OAA = tax-free
PTI (Previously Taxed Income)	Pre-1983 S-Corp income (rare)	Distributions from PTI = tax-free

Example: S-Corp converted from C-Corp in 2020. As of 2025:

Account	Balance
AAA	$500,000
AE&P (from C-Corp years)	$300,000
Shareholder basis	$800,000

Distribution of $900,000:

Source	Amount	Tax Treatment
AAA	$500,000	Tax-free
AE&P	$300,000	Taxable dividend (23.8%) = $71,400
Remaining basis	$100,000	Tax-free
Total tax		$71,400

If the S-Corp had never been a C-Corp (no AE&P):

Source	Amount	Tax Treatment
Basis	$800,000	Tax-free
Excess	$100,000	Capital gain (23.8%) = $23,800
Total tax		$23,800

The AE&P layer costs the shareholder an additional $47,600 in this example. Shareholders should consider making an AAA bypass election under IRC 1368(e)(3) or distributing all AE&P as a deemed dividend before it creates ongoing tax complications.

Illustrative numbers only, not a real client and not advice for your facts.

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Cite this page

Yarik Yarosh, CPA. "S-Corp Shareholder Basis and Distributions: AAA, OAA, PTI, and the Ordering Rules That Determine Taxability." Blue Cloud CPA, September 5, 2026. https://bluecloudcpa.com/guides/small-business-s-corp-shareholder-basis-distributions-aaa-ordering-rules

This guide is general information, not tax advice for your specific situation. Which points apply, and how, depends on your facts.