Tax Org Chart Symbols: Shapes, Lines, and Thresholds

Tax org chart symbols are a standardized visual shorthand: shapes encode how each entity is classified for federal income tax, lines encode how entities are connected, and short labels pin down elections, jurisdictions, and special statuses that change the tax picture. Learn the four core shapes and the two core line styles, and a diagram that looked like abstract geometry starts telling you where income is taxed, which entities file returns, and which thresholds trigger extra reporting. The conventions below come from the IRS’s own examiner training on global tax org charts, which is the closest thing to an industry standard and is broadly followed by large accounting firms.¹

The Four Shapes and What They Classify

Every entity on a tax org chart gets one of four shapes, and the shape reflects federal tax classification, not the entity’s legal form under state law.¹

Rectangle: corporation. A rectangle (sometimes drawn as a square) is a corporation. By default that means a C-Corporation, which pays its own federal income tax at 21 percent, with shareholders taxed again on dividends.² If the rectangle has an “S” inside it, the corporation has elected S-Corp status and passes income and losses through to shareholders instead.

Diamond: partnership. A diamond is a partnership. Most multi-member LLCs that never elected corporate treatment show up as diamonds. The entity files an information return, but tax is paid by the partners on their own returns based on their share of income, deductions, and credits.

Triangle: disregarded entity, branch, or individual. A triangle is a disregarded entity, a foreign branch, or an individual. A disregarded entity is a legal person that the tax code ignores: its income and expenses appear directly on its owner’s return, with no separate entity-level filing. Single-member LLCs that never elected corporate treatment fall here.¹

Circle: trust or estate. A circle is a trust or estate, generally filing Form 1041 under Subchapter J.³ Circles also appear for special-purpose vehicles in securitization structures where the vehicle is organized as a trust.

These conventions are widespread but not required by regulation. Some firms swap the triangle and circle, or draw ovals in place of circles. When a chart shows a legend, read it before assuming.

Solid Lines, Dashed Lines, and Percentages

Shapes tell you what each entity is. Lines tell you how they connect.

A solid line is direct equity ownership: stock, membership interests, partnership interests. The percentage written beside the line quantifies the stake. “100% Equity” means full ownership. Something like “51% Voting” flags a disproportionate arrangement where voting rights and economic rights don’t match, common in private equity structures and dual-class stock.

A dashed or dotted line is a non-equity relationship. That usually means intercompany debt, a licensing arrangement, a management agreement, or a service contract. A dashed line labeled “$50M Loan” running from a parent to a subsidiary is a financing relationship, not an ownership stake. The distinction matters because interest and dividends are taxed very differently, and one of the fastest ways to read a chart is to separate the equity skeleton from the financing overlay.

Line thickness sometimes carries meaning too. Heavier solid lines are occasionally used to emphasize stakes that cross an important threshold, such as the 80 percent consolidation line or the more-than-50 percent CFC line. Not every chart uses this convention, but when line weight varies deliberately, it is usually signaling a threshold.

Labels Inside the Shape

The shape gives the broad classification. Text inside or beside the shape refines it.

S and QSub

An “S” inside a rectangle marks an S-Corporation, which routes income and losses through to shareholders rather than paying tax at the entity level. Below an S-Corp parent, you may see a “QSub” label — a Qualified Subchapter S Subsidiary. A QSub must be a domestic corporation with 100 percent of its stock held by the S-Corp parent, and the parent must affirmatively elect QSub treatment. Once elected, the QSub is not treated as a separate corporation; its assets, liabilities, income, and deductions belong directly to the S-Corp parent.⁴ On the chart a QSub typically appears as a triangle even though it is legally a corporation, because that is how the tax code treats it.

DRE, DE, and FDE

You will often see “DRE” or “DE” written inside a triangle to confirm disregarded entity status. The triangle already signals the classification, so the label is a redundancy check. IRS training materials use “DE” for domestic and “FDE” for foreign disregarded entities, so either abbreviation may appear.¹ These labels are especially useful for foreign entities, where the default classification rules are less intuitive.

Jurisdiction Tags

Two- or three-letter codes outside the shape indicate where the entity is legally organized. “DE” next to a shape (rather than inside it) means Delaware. “UK,” “Cayman,” and “Lux” mark foreign entities. Jurisdiction tags are not decorative. They tell you which treaty may apply, whether foreign withholding taxes are in play, and what state-level obligations exist. A Delaware corporation, for instance, owes annual franchise tax to Delaware regardless of where it operates.

Symbols for Financial Instruments

Not every line is plain equity or a vanilla loan. Charts of larger structures use additional icons or line styles to flag hybrid instruments.

Preferred stock often gets its own line style or icon to separate it from common equity. This matters because preferred stock with certain features, such as fixed dividends, mandatory redemption, or no voting rights, can be recharacterized as debt for tax purposes. If the IRS reclassifies purported equity as debt, what looked like a dividend becomes deductible interest for the issuer, and withholding obligations may change. The statutory authority sits in Section 385, which directs Treasury to consider factors like whether there is a written promise to pay, the issuer’s debt-to-equity ratio, and whether the instrument is convertible into stock.⁵

Warrants, options, and convertible debt sometimes appear as arrow-like symbols marking a potential future claim on equity. Their presence matters for constructive ownership: you may not own 50 percent of a foreign corporation outright, but options that would push you past the line can bring CFC treatment.

Debt instruments with original issue discount (OID) may be called out with a specialized icon or annotation. OID requires the holder to accrue income over the instrument’s life even before receiving cash, so spotting it on the chart flags a tax obligation independent of any payment.

Why the Same Entity Can Take Different Shapes

A Delaware LLC could appear as a diamond, a triangle, or even a rectangle depending on which election it made. The mechanism is Form 8832, the Entity Classification Election.⁶

If an entity never files Form 8832, Treasury regulations assign a default. For domestic entities the defaults are simple: single-owner is disregarded (triangle), two or more owners is a partnership (diamond). Foreign entities follow different defaults tied to whether any member has unlimited personal liability. If all members have limited liability, the foreign entity defaults to a corporation (rectangle). If at least one member has unlimited liability, it defaults to a partnership or a disregarded entity depending on member count.⁷

So when you see a foreign LLC drawn as a triangle in a jurisdiction where all members have limited liability, the shape is telling you that someone filed Form 8832 to override the corporate default. That single election often carries large tax consequences, particularly in structures designed to reduce foreign withholding or simplify CFC reporting.

The Threshold Numbers to Scan For

Percentages on a chart are not decoration. Specific ownership levels trigger entirely different tax regimes, and experienced readers scan the numbers first.

80 percent — consolidated filing. A domestic parent can file a single consolidated return with a subsidiary only if it owns at least 80 percent of the subsidiary’s total voting power and at least 80 percent of the total value of the subsidiary’s stock. Both tests must be met.⁸ A 79 percent line means the subsidiary cannot join the consolidated group, which changes where income is reported and how losses can be used. When a group qualifies, the chart usually draws a heavy or double-lined boundary around all its members.

More than 50 percent — CFC status. A foreign corporation is a controlled foreign corporation when more than 50 percent of its total voting power or total stock value is held by U.S. shareholders.⁹ CFC status brings Form 5471 filing and potential current-year income inclusion under the net CFC tested income rules formerly known as GILTI.¹⁰ Every foreign rectangle sitting under a more-than-50-percent U.S. ownership line is a Form 5471 filing obligation.

25 percent — foreign-owned U.S. corporations. When ownership runs the other direction and a foreign shape drops a solid line into a domestic rectangle at 25 percent or higher, the U.S. entity may need to file Form 5472 to report transactions with its foreign related parties.¹¹

Foreign triangles have their own filing consequence: foreign disregarded entities and branches trigger Form 8858, and in a stack of nested foreign triangles each one typically needs its own return.¹²

Reading a Chart From Top to Bottom

Start at the top. The topmost entity is usually the ultimate parent. Follow the solid lines downward and check the percentages. Every 80-percent-or-greater domestic subsidiary is a candidate for the consolidated group. Every border-crossing solid line into a foreign rectangle with more than 50 percent U.S. ownership marks a CFC.

Then look at the dashed lines. These are the financing and contractual relationships that don’t move ownership percentages but can dominate the tax picture. A structure crowded with dashed lines is one where interest deductions, withholding taxes, and the Section 385 debt-versus-equity question all come into play. When the ratio of dashed to solid lines looks lopsided, tax advisors will scrutinize whether purported debt should be reclassified as equity.

Finally, read the annotations. Jurisdiction tags identify treaties and foreign regimes. Labels like “QSub” and “DE” confirm that certain entities are tax-invisible despite being legally real. An “S” inside a rectangle means income flows through instead of being taxed at the entity level. Each annotation is shorthand for an election that took real legal work to establish and that carries ongoing compliance to maintain.

1
Internal Revenue Service. International Overview Training – Topic IV Global Tax Org Chart
2
GovInfo. 26 U.S. Code 11 – Tax Imposed
3
Internal Revenue Service. About Form 1041
4
Office of the Law Revision Counsel. 26 U.S. Code 1361 – S Corporation Defined
5
Office of the Law Revision Counsel. 26 U.S. Code 385 – Treatment of Certain Interests in Corporations as Stock or Indebtedness
6
Internal Revenue Service. About Form 8832, Entity Classification Election
7
eCFR. 26 CFR 301.7701-3 – Classification of Certain Business Entities
8
Office of the Law Revision Counsel. 26 U.S. Code 1504 – Definitions
9
Office of the Law Revision Counsel. 26 U.S. Code 957 – Controlled Foreign Corporations
10
Office of the Law Revision Counsel. 26 U.S. Code 951A – Net CFC Tested Income Included in Gross Income of United States Shareholders
11
Internal Revenue Service. About Form 5472, Information Return of a 25% Foreign-Owned U.S. Corporation or a Foreign Corporation Engaged in a U.S. Trade or Business
12
Internal Revenue Service. Instructions for Form 8858