What is Accumulated Earnings Tax and how do C-Corps avoid it?

One of the features that makes C-Corp status attractive to startup founders is the 21% flat corporate tax rate, which is lower than the top individual income tax rate of 37%. A founder might reason that leaving profits inside the corporation, rather than distributing them as dividends and triggering personal income tax, is an efficient way to defer taxes and let the business compound its capital.

That reasoning is valid up to a point. Beyond that point, a penalty tax called the Accumulated Earnings Tax steps in.

The Accumulated Earnings Tax (AET) is an additional 20% federal tax imposed on C-Corps that retain earnings beyond what the IRS considers the reasonable needs of the business. It is a penalty specifically designed to prevent founders and shareholders from using the corporation as a tax shelter to avoid paying individual income tax on corporate profits.

For most early-stage startups that are burning cash or actively reinvesting in growth, the AET is not an immediate concern. For a profitable Delaware C-Corp that is accumulating retained earnings without a documented plan for using them, understanding the AET and how to stay on the right side of it is important tax planning.

How the accumulated earnings tax work under IRC Section 531

The AET is imposed under Internal Revenue Code Section 531 and applies to every C-Corporation, domestic or foreign, that accumulates earnings with the purpose of avoiding income tax on its shareholders. Section 532(a) of the Code states that the tax applies to any corporation formed or availed of for the purpose of avoiding the income tax with respect to its shareholders by permitting earnings and profits to accumulate instead of being divided or distributed.

The key phrase is "formed or availed of for the purpose of avoiding income tax." The AET is a purpose-based penalty tax. The IRS must establish that the accumulation of earnings was motivated by a desire to avoid shareholder-level tax, not by genuine business needs. This means a corporation that retains earnings for legitimate business reasons has a strong defense against the AET, provided those reasons are documented.

The AET rate is 20% of accumulated taxable income, as defined in IRC Section 535. In addition to other taxes imposed by this chapter, there is hereby imposed for each taxable year on the accumulated taxable income of each corporation described in Section 532, an accumulated earnings tax equal to 20 percent of the accumulated taxable income. This rate has been 20% since 2013 and aligns with the qualified dividend rate, making it specifically calibrated to eliminate the tax benefit of retaining earnings rather than distributing them as taxable dividends.

The accumulated taxable income subject to the AET is not simply the corporation's net income. It is calculated by starting with taxable income and making several adjustments: deducting federal income taxes paid, deducting dividends paid during the year, and then subtracting the accumulated earnings credit.

The $250,000 Accumulated Earnings Credit

The accumulated earnings credit is the most important structural protection against the AET for most C-Corps. To calculate accumulated taxable income, IRC Section 535(c) allows a minimum accumulated earnings credit. In general, the minimum credit is the amount by which $250,000 exceeds the accumulated earnings and profits at the close of the preceding year.

In practical terms, this means most C-Corps can accumulate up to $250,000 in total earnings and profits without facing any AET exposure at all. A corporation with $200,000 in accumulated earnings and profits at the end of the prior year has a $50,000 minimum credit available for the current year.

In the case of a corporation the principal function of which is the performance of services in the field of health, law, engineering, architecture, accounting, actuarial science, performing arts, or consulting, subparagraph (A) shall be applied by substituting "$150,000" for "$250,000."

This distinction matters for founders of service businesses. A technology consultancy, law firm, or accounting practice structured as a C-Corp faces a lower threshold of $150,000 rather than $250,000. Startups that provide professional services and are considering C-Corp structure should factor this lower threshold into their retained earnings planning.

The $250,000 credit is a floor, not a ceiling. An accumulation in excess of the $250,000 minimum credit is not an indication of an unreasonable accumulation. There is no statutory maximum credit that can be allowed. The maximum credit allowed is the amount of current earnings and profits retained for the reasonable needs of the business.

This is the critical point: corporations can accumulate far more than $250,000 without triggering the AET, provided they can demonstrate that the accumulation serves the reasonable needs of the business. The $250,000 threshold is the floor below which the IRS will not even ask questions, not the ceiling above which the tax is automatically imposed.

What counts as a reasonable business need under IRC section 537

The defense against the AET is demonstrating that retained earnings serve the reasonable needs of the business. IRC Section 537 and the Treasury Regulations under it define what qualifies.

Reasonable business needs include the following categories, each of which must be supported by specific, documented plans rather than vague intentions.

Business expansion and plant or equipment acquisition. Retaining earnings to fund a planned expansion of operations, purchase of equipment, or development of new facilities is a recognized reasonable business need. The expansion must be specifically identifiable. The IRS looks for documented plans that name the type of expansion, the expected cost, and the timeline. A general intention to grow the business is not sufficient.

Working capital requirements using the Bardahl formula. The Bardahl formula, developed in federal case law, provides a method for calculating the amount of working capital a corporation reasonably needs to maintain normal operations through one full operating cycle. The formula calculates working capital needs based on the ratio of operating expenses to annual sales and the length of the operating cycle. Many advisors use the Bardahl formula to establish a defensible working capital reserve that is protected from AET scrutiny.

Debt retirement. Retaining earnings to repay outstanding business debt within a specific timeframe is a recognized reasonable need. The debt must be documented, the repayment plan must be specific, and the retained amount must not significantly exceed the outstanding obligation.

Product diversification and business acquisitions. Earnings retained for a documented plan to acquire another business or diversify into a new product line can qualify. The plan must be specific enough to demonstrate that the accumulation is genuinely for that purpose and not merely a tax deferral strategy.

Section 303 stock redemption needs. Corporations may retain earnings in anticipation of a Section 303 redemption, which allows a corporation to redeem stock included in a deceased shareholder's estate up to the extent of estate taxes and funeral and administration expenses. This is a planning-oriented provision for closely-held corporations with succession concerns.

What does not qualify as a reasonable business need:

Vague or indefinite plans for future expansion, without specific identifiable projects and timelines. General statements that the corporation might need the money someday. Investments in assets unrelated to the corporation's business. Personal loans to shareholders or payments for shareholder personal expenses. Accumulations in excess of what documented plans actually require.

Evidence the IRS uses to establish AET intent

The IRS does not typically stumble upon an AET issue accidentally. An AET audit is more likely to arise when a corporation is closely-held, profitable, paying minimal dividends, accumulating significant retained earnings year over year, and where the primary shareholders would benefit significantly from the tax deferral.

Under IRC Section 533, the fact that a corporation's earnings and profits are permitted to accumulate beyond the reasonable needs of the business is determinative of the purpose to avoid income tax on shareholders, unless the corporation proves otherwise by a preponderance of the evidence. This provision creates a presumption: if the accumulation is unreasonable, the purpose is presumed to be tax avoidance. The burden then shifts to the corporation to rebut that presumption.

Evidence the IRS examines in an AET inquiry includes the history of dividend payments and whether shareholders have historically received distributions. Minutes from board meetings that discuss the purpose of accumulations. Investment policies and whether retained earnings are invested in business assets or in passive investments unrelated to operations. Loans to shareholders, which can indicate that retained earnings are being used for personal benefit without triggering dividend treatment. Business plans and financial projections that do or do not support the accumulation.

The most effective documentation strategy is to ensure that board minutes at the end of each fiscal year specifically address the amount of earnings retained, the specific business purposes for which they are being retained, and the anticipated timeline for their use.

How the AET interacts with the TCJA and the current 21% rate

The Tax Cuts and Jobs Act of 2017 reduced the corporate income tax rate to a flat 21% but did not change the AET provisions in IRC Sections 531 through 537. The AET rate remained at 20%.

One consequence of the lower 21% corporate rate is that the incentive to accumulate earnings inside a C-Corp has increased relative to the pre-2018 environment, because the gap between the 21% corporate rate and the top 37% individual rate has grown. A founder paying 21% inside the corporation rather than 37% personally saves 16 percentage points on each retained dollar, compared to a smaller gap under the old 35% corporate rate.

The IRS is aware of this dynamic. The AET was specifically designed to address the scenario where a lower corporate rate creates an incentive to use the corporation as a tax deferral vehicle for shareholders. The 2017 rate reduction has not changed the legal framework or the IRS's enforcement authority over the AET, and practitioners have noted that the larger rate differential may increase the likelihood of scrutiny in cases where accumulations appear to serve primarily tax-deferral purposes rather than genuine business needs.

Does the AET apply to venture-backed startups?

For most early-stage venture-backed startups, the AET is not a near-term concern for several reasons.

Most venture-backed startups are not profitable in their early years and are burning cash rather than accumulating it. A corporation cannot accumulate earnings it does not have. The AET only applies to profitable corporations that retain earnings.

Venture-backed startups that do become profitable typically have well-documented plans for deploying that profitability into continued product development, hiring, sales and marketing, and expansion. These documented uses satisfy the reasonable needs of the business standard.

The AET applies specifically when accumulation is motivated by a desire to avoid dividend taxation. Venture-backed founders are not typically trying to avoid dividend taxation in the same way a small closely-held business owner might be. VC-backed C-Corps distribute capital through QSBS-eligible stock appreciation rather than dividends, and the tax planning calculus is different.

That said, a profitable startup that has reached a stage where it generates significant retained earnings year over year, pays no dividends, and does not have clearly documented plans for the retained capital should discuss AET exposure with its tax advisor. The threshold at which this conversation becomes relevant is lower than many founders assume.

Strategies C-Corps use to reduce AET exposure

Document the reasonable needs of the business annually: The most important step is maintaining contemporaneous documentation. Board minutes should include a specific discussion of retained earnings at each year-end, identifying the amount retained, the specific business purposes, the projects or needs those amounts address, and the expected timeline for deployment. Vague minutes that simply note that earnings are being retained for growth are significantly less defensible than minutes that identify specific projects with cost estimates and timelines.

Pay dividends strategically to reduce accumulated earnings: Dividends paid during the year reduce the accumulated earnings credit calculation. While dividends trigger shareholder-level tax and defeat the tax deferral purpose, strategic dividend payments can be part of an overall plan to keep accumulated earnings within a range that does not attract AET scrutiny. Consent dividends, which are dividends deemed paid with shareholder consent even if not actually distributed, are recognized under IRC Section 565 and can reduce accumulated taxable income without a cash outflow.

Use the Bardahl formula to document working capital needs: Working with a tax advisor to apply the Bardahl formula each year produces a defensible, quantified calculation of the corporation's legitimate working capital requirement. This calculation, documented in the board minutes, establishes that a specific portion of the accumulated earnings serves an operational purpose rather than a tax avoidance purpose.

Invest in business assets rather than passive investments: Retained earnings invested in equipment, intellectual property development, additional office space, or other business assets are more clearly serving business needs than retained earnings sitting in money market accounts or invested in securities unrelated to the business. The type of investment matters for AET documentation.

Structure compensation and retirement plans to reduce taxable income: Reasonable salary payments to founders who are active in the business reduce the corporation's taxable income and therefore reduce the base on which the AET calculation operates. Contributions to qualified retirement plans, such as a 401(k) or defined benefit plan sponsored by the corporation, also reduce taxable income while retaining value within a controlled structure.

Entities exempt from AET

Not all C-Corps are subject to the AET. The following entity types are explicitly exempt under IRC Section 532(b):

Personal holding companies, as defined in IRC Section 542, are not subject to the AET. However, they are subject to a separate 20% Personal Holding Company Tax on undistributed personal holding company income, which covers a narrower category of income. A corporation that meets the definition of a personal holding company faces the PHC tax instead of the AET.

Tax-exempt corporations under Subchapter F of Chapter 1 of the Code are not subject to the AET.

Passive foreign investment companies and foreign personal holding companies are not subject to the AET under the general domestic rules, though they face their own passive income tax regimes.

S-Corporations are not C-Corps and do not pay corporate-level income tax, so the AET does not apply to them. The AET is a C-Corp-specific concern.

What does this mean for India-US Founders?

For an Indian founder running a profitable Delaware C-Corp, the AET is relevant in the same way it is relevant for any domestic founder: if the corporation accumulates earnings beyond its documented reasonable needs, the IRS can impose the 20% penalty tax.

One India-specific dimension worth noting is the interaction between the AET and GILTI or NCTI obligations. An Indian founder whose Delaware C-Corp has an Indian subsidiary is already subject to NCTI inclusion on the Indian subsidiary's profits. Those profits, once included in the US parent's taxable income, contribute to the parent's accumulated earnings and profits. The combination of NCTI inclusion and retained earnings in the US parent can accelerate the pace at which accumulated earnings build up, making AET documentation more important earlier than it might be for a purely domestic C-Corp.

The India-US tax treaty does not provide any specific relief from the AET. The AET is a domestic US corporate tax that applies regardless of the nationality of the shareholders. Foreign shareholders benefit from the same defense strategies as domestic shareholders: documenting reasonable business needs and ensuring that the accumulation is not motivated by a desire to avoid tax on distributions.

Managing C-Corp retained earnings strategy, documenting reasonable business needs, and staying ahead of AET exposure as your startup becomes profitable requires coordinated tax planning across your annual returns and board governance. Book a demo with Inkle to work through your retained earnings position and AET documentation strategy with a cross-border tax professional.

Frequently Asked Questions

What is the accumulated earnings tax rate and threshold in 2026?

The AET is imposed at a rate of 20% of accumulated taxable income under IRC Section 531. For most C-Corps, the accumulated earnings credit provides a safe harbor equal to the amount by which $250,000 exceeds the corporation's accumulated earnings and profits at the close of the preceding year. For service corporations in the fields of health, law, engineering, architecture, accounting, actuarial science, performing arts, and consulting, the threshold is $150,000 instead of $250,000. Accumulations above these floors are not automatically taxable. They are subject to the AET only if the IRS can establish that the purpose of the accumulation was to avoid income tax on shareholders.

Does the accumulated earnings tax apply to a profitable startup that is not paying dividends?

Not automatically. The AET applies only when the IRS can demonstrate that the accumulation of earnings was motivated by a desire to avoid shareholder-level tax rather than by genuine business needs. A profitable startup that has documented plans for its retained earnings, such as product development, hiring, equipment purchases, or expansion into new markets, can retain earnings in excess of the $250,000 credit threshold without triggering the AET. The key is documentation. Board minutes that specifically address the amount retained and the business purpose for each year are the primary defense. A profitable startup with no documented plans for its accumulations is in a weaker position than one with clearly articulated and specific plans.

What is the Bardahl formula and how does it help avoid the accumulated earnings tax?

The Bardahl formula is a method developed through federal tax case law for calculating the working capital a corporation legitimately needs to sustain operations through one operating cycle. It estimates working capital needs by applying the ratio of operating expenses to annual sales, adjusted for the length of the operating cycle. The result produces a defensible, quantified calculation of the corporation's minimum operational cash needs. When documented in board minutes and supported by the underlying financial data, the Bardahl formula calculation establishes that a portion of the corporation's retained earnings serves a specific operational purpose rather than a tax avoidance purpose. Working with a CPA to apply the formula annually is one of the most practical tools for building an AET documentation strategy.

Can a C-Corp avoid the accumulated earnings tax by paying salaries to founders instead of dividends?

Paying reasonable salaries to founders who are active employees of the corporation reduces the corporation's taxable income and therefore reduces the accumulated taxable income base on which the AET is calculated. This is a recognized and legitimate strategy. However, the IRS scrutinizes compensation paid to shareholder-employees for reasonableness, and compensation that is unreasonably high relative to the services performed may be reclassified as a dividend, which does not reduce accumulated taxable income and also creates an accuracy-related penalty exposure. The salary strategy works within the bounds of reasonable compensation as determined by market rates for comparable positions. Retirement plan contributions, including employer matching contributions to a 401(k), are another way to reduce taxable income while retaining value in a controlled structure.