Yes, a business can open a brokerage account, and almost every recognized entity type qualifies. Corporations, LLCs, and partnerships routinely hold accounts in the entity’s own legal name to invest idle cash in stocks, bonds, mutual funds, and other securities. The account belongs to the business itself, which keeps company investments separate from the personal portfolios of its owners or officers. Expect roughly one to two weeks from application to approval once you have the right paperwork in order.
Which Business Structures Can Open One
C-corporations and S-corporations open accounts under the entity’s legal name, and the securities inside belong to the corporation rather than to any shareholder. LLCs work the same way whether they have a single member or several. In each case, the account is entity property, which preserves the liability separation these structures are designed to provide.
General partnerships and limited partnerships qualify too. The partnership itself holds the account, and the managing partner or a designated authorized person makes trading decisions.
Sole proprietorships are the exception worth flagging. Because the IRS treats the owner and the business as one taxpayer, the account is often tied directly to the owner’s personal tax identification. Some brokerages let sole proprietors open under a “doing business as” name, but the legal separation between business and personal assets doesn’t exist the way it does for corporations or LLCs.
Documents You Need to Provide
Brokerages must collect specific identifying information for every entity account. Under federal tax rules, any business that files returns or furnishes statements must use an Employer Identification Number as its taxpayer identifier.1Office of the Law Revision Counsel. 26 USC 6109 – Identifying Numbers If you don’t already have one, the IRS issues EINs at no charge through its online application.
You will also need the entity’s formation documents. For an LLC, that means Articles of Organization; for a corporation, Articles of Incorporation or the corporate charter. These prove the entity legally exists. Most brokerages also ask for the operating agreement (LLCs) or bylaws (corporations) to confirm who has authority to act on behalf of the business. The application itself will require a physical business address, the entity’s legal name exactly as it appears in state records, and the name and contact information of every person authorized to place trades or move money.
Identifying the Beneficial Owners
Federal anti-money-laundering rules require brokerages to identify the real people behind every legal entity that opens an account. Under the FinCEN Customer Due Diligence rule, the brokerage must collect the name, date of birth, address, and Social Security number of every individual who owns 25 percent or more of the entity, plus at least one person who controls the entity’s operations.2eCFR. 31 CFR 1010.230 – Beneficial Ownership Requirements for Legal Entity Customers Each identified owner typically must provide a copy of a government-issued ID such as a driver’s license or passport.
This is a separate obligation from the Corporate Transparency Act’s beneficial ownership reporting to FinCEN. As of March 2025, FinCEN exempted all U.S.-formed entities and their beneficial owners from that reporting requirement, and only foreign entities registered to do business in the United States must still file.3FinCEN. Beneficial Ownership Information Reporting The brokerage’s own duty to identify your beneficial owners at account opening remains fully in effect under the CDD rule regardless of that change.
How the Account Opening Process Works
Most brokerages handle entity applications through a dedicated section of their website, sometimes labeled “institutional” or “business accounts.” You upload scanned copies of your formation documents, provide the ownership and authorized-signer details, and submit electronically. A few firms still require original signatures on certain authorization forms, which means mailing physical copies to a processing center.
After submission, the compliance department verifies your information. This usually takes between three and ten business days. The brokerage confirms the entity is active and in good standing with the state where it was formed, cross-checks the beneficial ownership data, and validates authorized signers. If anything in the application doesn’t match public records, expect a request for clarification before final approval. A current Certificate of Good Standing from your state’s Secretary of State can speed things along.
Once approved, you fund the account by linking it to a business checking account. Electronic transfers through the ACH network are the most common method and typically settle in one to three business days at no charge. Most brokerages cap daily ACH deposits for entity accounts, so if you need to move a large sum quickly, a wire transfer is faster but carries a fee.
How Investment Income Is Taxed by Entity Type
How investment gains, dividends, and interest are taxed depends entirely on your entity type, and the differences are large enough to affect which investments make sense for your business.
C-Corporations
A C-corporation pays a flat 21 percent federal tax on all income, including investment gains.4Office of the Law Revision Counsel. 26 USC 11 – Tax Imposed There is no preferential capital gains rate for corporations the way there is for individuals. Short-term and long-term gains, dividends, and interest all flow into the corporation’s taxable income at that same 21 percent rate. If the corporation later distributes profits as dividends, shareholders pay tax again on the distribution, creating the double-taxation layer that C-corps are known for.
S-Corporations
S-corporations pass most income through to shareholders, who report it on their personal returns. But an S-corp that converted from C-corp status and still carries accumulated earnings and profits from those earlier years faces a specific trap. If more than 25 percent of the company’s gross receipts come from passive investment income, the IRS imposes an entity-level tax on the excess.5Office of the Law Revision Counsel. 26 USC 1375 – Tax Imposed When Passive Investment Income Exceeds 25 Percent of Gross Receipts Passive investment income for this purpose includes dividends, interest, rents, royalties, and annuities.
The consequence escalates if the problem persists. Three consecutive years above that 25 percent threshold while carrying accumulated C-corp earnings and profits will automatically terminate the S-election entirely.6Office of the Law Revision Counsel. 26 USC 1362 – Election, Revocation, Termination This is where S-corps that aggressively invest idle cash can get into real trouble. The typical fix is to distribute accumulated earnings and profits before building a large investment portfolio, but that decision calls for professional tax guidance.
LLCs and Partnerships
Multi-member LLCs taxed as partnerships and standalone partnerships pass all investment income through to the owners, who report it on their individual returns at whatever rate applies to them. For higher earners, an additional 3.8 percent net investment income tax applies to individuals with modified adjusted gross income above $250,000 on a joint return or $200,000 for single filers.7Office of the Law Revision Counsel. 26 USC 1411 – Imposition of Tax Investment income earned through a pass-through entity generally counts toward that calculation, so the effective federal rate on business investment gains can sit well above the standard capital gains rate for owners in that range.
Single-member LLCs are disregarded for tax purposes and report everything on the owner’s personal return, the same way a sole proprietorship does. The same net investment income tax thresholds apply.
Cash Accounts, Margin Accounts, and Internal Authority
A business brokerage account can be opened as a cash account or a margin account. A cash account restricts you to buying securities with money already on deposit. A margin account lets you borrow against your existing holdings to purchase additional securities, with extra requirements attached.
FINRA requires a minimum of $2,000 in equity to open a margin account.8FINRA. FINRA Rule 4210 – Margin Requirements The initial margin requirement is typically 50 percent of the purchase price for most securities, meaning you can borrow up to half the cost of a stock purchase. Maintenance requirements then apply: if the equity in the account drops below a set threshold, the brokerage will issue a margin call for additional funds or liquidate positions to cover the shortfall. For a business, an unexpected margin call can strain operating cash flow in ways that hit harder than they would for an individual investor.
Before opening any account, confirm that your governing documents authorize investment activity. A corporate resolution should name the individuals who can trade and define any investment limits. An LLC operating agreement should include language granting managers or members the authority to purchase and dispose of assets, including securities. Brokerages routinely ask for copies of these authorizations, and if the documents are silent on investment authority, you may need to amend them before the account can be approved.