Most S-corp owners meet the accumulated adjustments account the day a distribution they expected to be tax-free comes back partly taxable. The business had a good year, cash moved from the company account to the personal one, and somehow there's a dividend on the return. The explanation lives in two accounts your Form 1120-S has been quietly keeping all along: the accumulated adjustments account and the other adjustments account.
Meet the two accounts
An S-corp doesn't pay its own income tax; the income lands on your Schedule K-1, and you pay it. The accumulated adjustments account, or AAA, is the running total §1368(e) keeps of that already-taxed income the company hasn't distributed yet. It climbs with the business income and gains that hit your return, falls with losses and deductions, and falls again as you take distributions. Money that comes out of AAA is money you've already been taxed on, so it comes out tax-free, as long as you have basis.
The other adjustments account, or OAA, is the smaller sibling. It holds the things that change your basis but never showed up as taxable income: mainly tax-exempt income, like municipal bond interest or certain life-insurance proceeds, plus the expenses tied to it. Keeping that money in its own column is the entire point. Tax-exempt income has to stay walled off from the taxed income in AAA, because the two get treated differently the moment cash goes out.
A distribution, in order
The ordering only bites when the S-corp used to be a C corporation. A company that was a C corp before it elected S status can carry leftover accumulated earnings and profits (E&P), old C-corp income that was never paid out. When that's the case, a distribution comes out in the fixed sequence §1368(c) sets:
- First from AAA, tax-free, to the extent of your basis.
- Then from accumulated E&P, and this layer is a taxable dividend.
- Then from OAA and remaining basis, tax-free again.
Try it with real figures. Say your S-corp still has $50,000 of accumulated E&P left from its C-corp days. This year it earns $200,000 of ordinary income and collects $10,000 of tax-exempt municipal interest. AAA rises by the $200,000, OAA rises by the $10,000, and the old $50,000 of E&P sits there. You take a $260,000 distribution.
Now run the money. The first $200,000 clears AAA and comes out tax-free. The next $50,000 falls into the E&P layer and comes out as a taxable dividend on your personal return, taxed today on income the corporation earned back in its Form 1120 days. Only once that dividend layer drains does the last $10,000 reach OAA and come out tax-free. Notice the odd result: the company collected $10,000 of muni interest the code never taxes, and you couldn't touch a dollar of it until you'd paid dividend tax on earnings from another era. Keeping that story straight is the whole reason OAA gets its own column.
If your S-corp was never a C corporation
Most S-corps never were C corps, and for them the drama mostly disappears. No accumulated E&P means no dividend layer waiting in the middle. A distribution is tax-free up to your stock basis and capital gain past it, §1368(b), end of analysis. So does the account-keeping still matter? Less, but don't skip it. Schedule M-2 still gets filed every year, and the day the company picks up C-corp E&P through a merger, or you sell, or a buyer's CPA asks for twenty years of basis history, a clean M-2 trail is the difference between an afternoon of tie-out and a forensic project.
Two things that trip people up
Two mechanics catch even experienced preparers, and both live on Schedule M-2. Losses can drive AAA below zero, and a bad year often does exactly that. Distributions can't. A distribution draws AAA down to zero and stops; whatever's left of the check moves on to the next layer, accumulated E&P if the company has any.
The other one is simpler and more common: tax-exempt income never belongs in AAA. Schedule M-2 gives OAA its own column for exactly this reason, and muni interest still lands in the AAA column all the time. It's the most frequent M-2 error I see. The return files fine. The tax-free cushion is just overstated now, and the next distribution gets sourced from the wrong pile.
If your S-corp ever filed as a C corp, find out how much accumulated E&P is still on the books before you take a large distribution. That number, not your bank balance, decides how much of the check is a taxable dividend. Bring us a year of the 1120-S and we'll rebuild AAA, OAA, and E&P so the next distribution holds no surprises.
This article is general information, not tax, legal, or accounting advice, and reading it does not create a CPA-client relationship. Tax rules change and depend on your specific facts. Please consult a qualified professional about your situation before acting.