What Is the S Corp AAA and How Does It Work?

The S corp AAA, short for Accumulated Adjustments Account, is a running total kept at the corporate level that tracks how much of an S corporation’s income has already been taxed to shareholders but not yet distributed. Its job is to decide, when the company pays out cash or property, how much of that distribution is tax-free and how much is a taxable dividend. The account only drives distribution tax treatment when the S corporation carries accumulated earnings and profits (AEP) from prior C corporation years, but the IRS recommends every S corporation maintain it anyway, because a later merger or reorganization can make the history necessary retroactively.¹

What the AAA Tracks

The AAA is a single account on the corporation’s books. It is not divided among shareholders, and it does not belong to anyone individually. It starts at zero on the first day of the corporation’s first tax year as an S corporation and is adjusted each year for the income, losses, deductions, and non-deductible expenses that flow through to shareholders. The ending balance is reported each year on Schedule M-2 of Form 1120-S.¹

Think of it as a pool of already-taxed dollars sitting inside the corporation. Shareholders reported the income on their personal returns when it passed through; the AAA records how much of that income the corporation still holds. When a distribution later comes out, the AAA tells you whether those dollars are tax-free (because they trace back to already-taxed S corporation income) or taxable as a dividend (because they trace back to old C corporation earnings).

One important exclusion: tax-exempt income and the expenses tied to it stay out of the AAA. Tax-exempt interest and similar items are tracked in a separate Other Adjustments Account (OAA) instead.²

When the AAA Actually Changes Your Tax Bill

If your S corporation has always been an S corporation and never absorbed C corporation assets, it has no AEP. In that case, distributions are easy: each one reduces the shareholder’s stock basis, and anything beyond basis is capital gain.² You do not technically need the AAA to work out the tax result.

The AAA matters most when AEP is present. That happens when the corporation was once a C corporation and still carries undistributed earnings from that era, or when it inherited AEP through a reorganization. In those situations, the AAA stands between the shareholders and taxable dividend treatment on every dollar paid out.

Even without AEP, the IRS still recommends keeping the account current. If the corporation later merges with an entity carrying AEP, you will need the history, and rebuilding years of adjustments after the fact is far harder than running the schedule each year.¹

How the AAA Goes Up and Down Each Year

The AAA adjustments mirror most of the items that adjust shareholder stock basis under Section 1367, with the critical exception that tax-exempt income and its related expenses are excluded.³

Increases

The AAA goes up by the corporation’s taxable income items. That includes separately stated items like capital gains, interest, and rental income, plus non-separately computed ordinary business income. The excess of depletion deductions over the basis of the depleted property can also increase the AAA in limited circumstances involving property other than oil and gas.³

Decreases

The AAA goes down by separately stated losses and deductions, non-separately computed ordinary losses, and non-deductible expenses that are not tied to tax-exempt income. Common non-deductible items include life insurance premiums where the corporation is the beneficiary and the reduction in research expenditures required when claiming the research credit.⁴ Federal taxes from years when the corporation was a C corporation do not reduce the AAA, and neither do expenses tied to tax-exempt income.³

The Order of Adjustments

The adjustments must be made in a set sequence each year:

Increase the AAA for all income items.
Decrease the AAA for deductible losses, non-deductible expenses, and depletion, but check first for a net negative adjustment.
Decrease the AAA for non-dividend distributions, but not below zero.
Apply any net negative adjustment last.

The net negative adjustment rule is the subtle part. If the year’s losses and non-deductible expenses exceed the year’s income, the excess is a net negative adjustment. When that happens, you skip it in the second step and apply it only after distributions have already come out of the AAA. In a loss year, distributions therefore come out of the positive AAA that existed before the loss lands, which can let more cash come out tax-free than you would expect.¹

Distributions can never drive the AAA below zero. Only losses, deductions, and non-deductible expenses can create a negative balance, and once negative, the AAA must be absorbed back to zero by future income before any new positive AAA is available to source tax-free distributions.³

How Distributions Are Sourced When AEP Exists

Section 1368(c) sets the sourcing order when an S corporation carries AEP. The IRS practice unit lays out the full stack:⁵

AAA first. The distribution comes out of the positive AAA balance and is tax-free up to the shareholder’s stock basis. Any amount above basis is capital gain.
Previously Taxed Income (PTI). If any PTI remains from pre-1983 S corporation years, it comes next. PTI is shareholder-specific and cannot transfer between owners, so in practice very few corporations still carry it.
AEP. Once AAA and PTI are exhausted, further distributions are taxable dividends to the extent of remaining AEP.
OAA and remaining basis. After AEP is gone, distributions come out of the OAA and then reduce the shareholder’s remaining stock basis tax-free.
Anything left over is treated as gain from the sale of stock.

The AAA, in other words, acts as a shield. As long as the balance is positive, distributions stay tax-free up to each shareholder’s basis. Once the AAA is depleted, the next dollar out hits the AEP layer and becomes a taxable dividend.²

The AAA Is Not Your Stock Basis

The AAA and shareholder stock basis sound similar because many of the same items adjust both. They are not the same thing, and confusing them is a reliable way to misreport distributions.

The AAA is one corporate-level number shared across all shareholders. It answers a single question: how much of the corporation’s undistributed income has already been taxed? Stock basis is personal to each shareholder and measures their investment in the corporation, including contributions, loans, and their share of income and loss. Basis limits how much loss a shareholder can deduct and how much of a distribution can come out tax-free.

Most ordinary items move both accounts the same way. Several items create divergence:

Tax-exempt income increases stock basis but not the AAA. It goes to the OAA.
A distribution sourced from AEP (a taxable dividend) does not reduce the AAA, because it did not come from there, but it still reduces the shareholder’s stock basis.
Capital contributions and shareholder loans increase basis but have no effect on the AAA.

A shareholder can easily have a basis well above or well below the AAA. The AAA ordering sets the character of the distribution; each shareholder’s basis sets their personal tax-free ceiling.²

Property Distributions

When an S corporation distributes property instead of cash, the AAA effect depends on whether the property has gained or lost value.

If fair market value exceeds tax basis, the corporation is treated as if it sold the property to the shareholder at fair market value. The resulting gain flows through on the K-1 and increases the AAA like any other income item. The distribution amount equals the property’s fair market value, reduced by any liabilities the shareholder assumes.⁶

If fair market value is less than tax basis, the corporation cannot recognize the loss. The disallowed loss is a non-deductible expense that reduces the AAA. When several properties are distributed together, gains and losses cannot be netted; each property is handled on its own.⁶

A former C corporation distributing an asset within the built-in gains recognition period may also owe the corporate-level built-in gains tax on top of the gain that flows through to shareholders.⁶

What Happens to the AAA When the S Election Ends

The AAA does not vanish on the day the S election terminates. Section 1371(e) gives the corporation a post-termination transition period (PTTP) during which cash distributions can still come out of the remaining AAA tax-free, reducing stock basis dollar for dollar, with any excess treated as gain from a sale of stock.⁷

The PTTP generally runs from the day after the last S corporation day through the later of one year after that date or the extended due date of the final S corporation return.⁸ Two limits catch people out. Only money qualifies for PTTP treatment; property distributions do not. And once the AAA is exhausted during the PTTP, further distributions fall under the regular C corporation rules of Section 301 and become taxable dividends to the extent of earnings and profits.⁹

The AAA Bypass Election and the Passive Income Trap

The default order puts the AAA first, which usually suits shareholders because it keeps money tax-free. In some cases, though, the corporation wants to distribute AEP first. The AAA bypass election under Regulation 1.1368-1(f) lets the corporation skip the AAA and treat distributions as coming from AEP, making them taxable dividends.¹⁰

Why volunteer for a taxable dividend? Because AEP creates two serious problems:

First, the passive investment income tax under Section 1375. If the corporation has AEP and more than 25 percent of its gross receipts are passive investment income — rents, royalties, dividends, interest, and annuities — it owes a corporate-level tax on the excess net passive income at the highest corporate rate.¹¹ That is a real cost on top of the shareholder-level tax.

Second, if the same combination of AEP and excess passive income continues for three consecutive years, the S election terminates automatically, and the corporation cannot re-elect for five years without IRS consent.¹²

Distributing enough AEP to zero out the balance eliminates both risks. The bypass can be paired with a deemed dividend election under Regulation 1.1368-1(f)(3), which treats a specified amount as distributed from AEP even when no cash actually moves. The deemed dividend election requires a statement attached to a timely filed Form 1120-S, identifies each shareholder’s share, and requires every shareholder’s consent.¹⁰

Record-Keeping and Common Mistakes

The corporation must keep a continuous year-by-year record of the AAA starting from the first day of its S election. That record supports Schedule M-2 and should document every adjustment in the correct order: income first, then expenses, then distributions, then any net negative adjustment.¹

If the corporation cannot produce auditable AAA records, the IRS will treat all distributions as sourced from AEP and tax them as ordinary dividends. The burden to prove the AAA balance, and the tax-free character of distributions, sits on the corporation.⁵

The recurring failures are predictable. Tax-exempt income gets mixed into the AAA instead of the OAA. The ordering rules get applied out of sequence. Non-deductible expenses are overlooked. Corporations that converted from C corporation status years ago sometimes assume AEP has been used up without actually tracing the distributions, and the gap surfaces on examination. Keeping the AAA reconciliation current each year, rather than reconstructing it later, avoids most of these problems.

1
Internal Revenue Service. 2025 Instructions for Form 1120-S
2
Office of the Law Revision Counsel. 26 USC 1368 – Distributions
3
GovInfo. 26 CFR 1.1368-2 – Accumulated Adjustments Account
4
Internal Revenue Service. Adjustments to Stock Basis
5
Internal Revenue Service. Distributions with Accumulated Earnings and Profits
6
Internal Revenue Service. S Corporations Property Distribution
7
Office of the Law Revision Counsel. 26 USC 1371 – Coordination with Subchapter C
8
eCFR. 26 CFR 1.1377-2 – Post-Termination Transition Period
9
Federal Register. Eligible Terminated S Corporations
10
eCFR. 26 CFR 1.1368-1 – Distributions by S Corporations
11
Office of the Law Revision Counsel. 26 USC 1375 – Tax Imposed When Passive Investment Income Exceeds 25 Percent of Gross Receipts
12
Office of the Law Revision Counsel. 26 USC 1362 – Election; Revocation; Termination