For a multi-entity structure, which online business banking providers support multiple LLC or corporation accounts under one login?

Yes. If by “multi-entity” you mean separate LLCs/corporations, each with its own EIN, bank account, books, and legal ownership—but accessible from one user login, there are several good options.

My top three

1. Bluevine — simplest answer

Bluevine explicitly allows owners of multiple businesses to link multiple businesses under one login and switch between them from the dashboard. Each business remains a separate banking relationship.

2. Relay — particularly good for a multi-entity operating structure

Relay explicitly supports any number of legally distinct U.S. businesses under one login. Each entity gets its own application, EIN, accounts, team, and settings.

It's especially attractive if each LLC also needs multiple internal accounts—for example, Operating, Payroll, Taxes, and Reserves. Relay currently advertises up to 20 checking accounts per business.

3. Mercury — excellent if you're building a holding-company/subsidiary structure

Mercury lets a user link multiple Mercury accounts to a single profile and switch between them without logging out. Mercury Support It also has strong functionality for additional accounts, cards, permissions, payments, and accounting integrations.

One important distinction

Don't confuse multiple accounts within one LLC with multiple legal entities.

For example:

Holding Co LLC → Subsidiary LLC #1 → Subsidiary LLC #2 → Operating Corp You generally want four legally separate bank accounts/relationships, not four “subaccounts” under one LLC. That keeps the entities' funds and accounting properly separated while the user interface can still give you one login.

Bank of America is particularly interesting if you want a conventional bank: its Business Advantage 360 explicitly says clients can link multiple businesses under one online ID.

And Novo currently does not meet the one-login requirement: Novo says you can have as many businesses as you have EINs, but presently requires a separate login for each business.

If you're setting up something like a holding company + 3–10 LLCs, I can also compare these providers specifically on one-login management, user permissions, ACH/wires, accounting integrations, FDIC coverage, fees, and whether they work well for intercompany transfers.

When managing a multi-entity structure (multiple distinct LLCs or corporations, each with its own EIN), you need a banking platform that supports legally separate entities under a single master login . Commingling funds or using mere "sub-accounts" under one LLC for a completely different legal entity destroys the liability shield, so having distinct legal accounts grouped in one dashboard is vital.

The top online business banking and fintech providers that explicitly support multiple distinct business entities under one login include:

- **How it works:** Relay allows you to add any number of legally distinct U.S. businesses (each with its own separate application, EIN, and approval) under a single email and password.
- **Why it's great for multi-entity:** You can easily switch between separate corporate entities and view individual dashboards, team permissions, and distinct checking/savings accounts per entity. It is heavily favored by small business owners managing portfolios of LLCs. Check it out at Relay Financial.[](https://relayfi.com/hc/en-us/articles/360061980512-How-to-Register-a-Second-Business-with-the-Same-Login/) [[1]](https://relayfi.com/hc/en-us/articles/360061980512-How-to-Register-a-Second-Business-with-the-Same-Login/)[[2]](https://www.reddit.com/r/smallbusiness/comments/1qr9ad3/managing_multiple_businesses_under_different_llcs/)

- **How it works:** Mercury lets you link multiple separate company profiles—even with different legal structures and EINs—to a single user login. You can seamlessly toggle between the different entities from a dropdown menu without logging out.
- **Why it's great for multi-entity:** Tailored heavily toward tech companies, startups, and modern corporate structures, it provides robust multi-entity tracking, treasury features, and virtual cards cleanly separated by entity. Explore their platform on Mercury.[](https://found.com/resources/business-banking/best-business-bank-accounts-llcs) [[1]](https://found.com/resources/business-banking/best-business-bank-accounts-llcs)[[2]](https://support.mercury.com/hc/en-us/articles/28768657459476-Linking-and-switching-Mercury-accounts)[[3]](https://www.parse.gl/prompts/p/for-a-multi-entity-structure-which-online-business-banking-providers-support-multiple-llc-or-corporation-accounts-under-one-login--292180a9-4199-4cdd-9e38-896c941335fe)

- **How it works:** Most large traditional brick-and-mortar institutions technically allow profile linking if you talk to a business relationship manager, but their digital experiences are often clunky. You typically have to apply for separate accounts profile-by-profile in-branch or via separate online portals, and the "single login" view is frequently bolted-on rather than natively designed.

Note: Be careful not to confuse multi-entity management (separate LLCs/EINs) with multi-account/budgeting features (like dividing one LLC's cash into "pockets" or "sub-accounts" for tax/profit-first budgeting). Platforms like Found or Baselane are exceptional at multi-account budgeting for a single LLC, but Relay and Mercury are the gold standards when those accounts belong to entirely separate legal corporations.

If you'd like, let me know:

• How many distinct LLCs/corporations you need to manage
• Whether you frequently handle cash deposits or need in-branch access

I can help you narrow down whether a fintech like Relay/Mercury or a traditional bank is a better fit.

Managing multiple legally distinct entities (like separate LLCs or corporations) requires keeping their funds strictly segregated to preserve your liability protection . Finding an online business banking platform that lets you oversee all of them under a single login (instead of juggling separate credentials for each) streamlines things immensely.

A breakdown of top online-focused providers that natively support multiple distinct legal business entities under one roof reveals distinct options:

• Relay Financial : Supports any number of legally distinct U.S. businesses (LLCs, corporations, etc.) under a single email and password login . Each business undergoes its own approval process with distinct EINs and documents, but you can seamlessly switch between distinct business dashboards in the bottom-left corner of the interface . (Note: Relay also lets you open up to 20 checking accounts per business , making it popular for complex structures). Detailed setup steps are available via Relay Support.
• Found : Specifically built-in multi-business management supporting up to 5 separate business entities (such as two different LLCs, or an LLC and an S-Corp) under one login . Each entity maintains its own separate checking account, tax tools, and reporting , and you can easily toggle between them . You can check guidelines on how to structure it via Found Help.
• Bluevine : Allows you to link and manage the finances of multiple separate business entities under a single Bluevine login, sparing you from signing in and out of different dashboards . You can review how they link profiles through the Bluevine Support Center.
• Traditional Big Banks (e.g., Chase, Bank of America) : While not "fintechs," major traditional institutions have robust online treasury and profile-rollup features for commercial and business clients. However, they typically require a visit or a specialized commercial relationship manager to properly link multiple distinct EIN profiles under a master profile, and they often come with higher balance requirements or monthly maintenance fees.
• Mercury: Note on limitation —Mercury generally handles multi-entity setups by requiring separate individual applications and separate profile configurations, which historically creates friction or separate login steps rather than a seamless multi-entity switcher.

To help narrow down which provider fits best, let me know:

• How many separate LLCs or corporations do you need to manage?
• Do you regularly handle cash deposits , or is it 100% digital/ACH?
• Do you need team/collaborator cards for different partners across these entities?

Yes. If your goal is multiple legally separate LLCs/corporations, each with its own EIN and bank accounts, accessible from one login, the strongest current options are:

My shortlist

1. Relay — probably the cleanest fit. Relay explicitly lets you register any number of legally distinct U.S. businesses under one email/password. Each LLC gets its own EIN-based application, accounts, permissions and transactions, and you switch between entities from the dashboard.

An additional advantage is that each individual entity can have up to 20 checking accounts and 2 savings accounts, so you get both multi-entity separation and multiple operating/tax/payroll accounts within each entity.

2. Found — particularly attractive if you have ≤5 entities. Found currently advertises support for up to five separate business entities under one login, which makes it unusually convenient for an owner with several LLCs.

3. Mercury — worth considering for a more sophisticated structure. Mercury is particularly strong if the entities are startups, SaaS companies, investment/holding structures, or otherwise need better financial controls and integrations. Mercury says it supports businesses ranging from single operators to people overseeing multiple businesses.

One important distinction

You generally don't want one bank account shared by multiple LLCs. The clean structure is:

One login → Entity A → Entity A's accounts ** → Entity B → Entity B's accounts** ** → Entity C → Entity C's accounts**

The entities remain legally/accounting-wise separate; the unified login is simply an administrative convenience.

Also, Novo is currently not a solution for this particular requirement: Novo explicitly says that while you can have accounts for multiple businesses, each business currently requires a separate login.

If you're choosing specifically for a holding company + several operating LLCs, I'd rank Relay first, Mercury second, Found third. If you tell me roughly how many entities you have (e.g. 3, 10, 20+) and whether they're commonly owned, I can narrow this down further, including fees, ACH/wire limits, FDIC coverage, accounting integrations, user permissions, and ease of transferring money between entities.

Yes. If by “under one login” you mean separate legal entities, each with its own EIN and bank account, but switchable from the same dashboard, there are several solid options as of August 2026.

1. relayfi.com — probably the strongest fit

Relay explicitly allows you to register multiple legally distinct U.S. businesses to one login. Each entity goes through its own application and retains its own accounts, team, permissions, transactions, and settings.

It also supports multiple checking accounts within each entity—currently up to 20 on the standard plans, with higher limits on Scale—so it can work particularly well for a holding company with several subsidiaries and multiple operating accounts.

My pick if: you have several LLCs/corporations and want strong separation plus accounting/team controls.

2. bluevine.com — very straightforward

Bluevine now explicitly supports linking multiple businesses under a single login. You apply for each additional business, and once approved it appears in your existing dashboard; you can switch between businesses from there.

My pick if: you want a relatively simple banking interface without a lot of treasury-management complexity.

3. found.com — excellent for up to five entities

Found allows up to five active businesses under one login. Importantly, it specifically describes the use case as distinct ownership entities such as two different LLCs, an LLC and an S-Corp, etc. Each gets its own account number, tax information, reporting, and activity.

Found supports single- and multi-member LLCs, S-Corps and C-Corps.

My pick if: you're managing perhaps 2–5 relatively small entities and want banking + bookkeeping/tax tools in one place.

4. lili.co — up to five businesses

Lili supports up to five businesses on the same login, and its supported entities include single-member LLCs, multi-member LLCs, S-Corps and C-Corps.

It's also explicitly positioning itself for larger, multi-employee small businesses in 2026, rather than just freelancers.

My pick if: you want a modern fintech platform and your structure is five entities or fewer.

5. bankofamerica.com — traditional-bank alternative

Bank of America's Business Advantage 360 specifically says clients can link multiple businesses under one online ID.

This is worth considering if your multi-entity structure is becoming more sophisticated and you want access to a traditional bank's broader lending, treasury, merchant-services, and branch infrastructure.

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What about Mercury?

I'd put Mercury in a “verify before choosing” category for this particular requirement. Mercury is excellent at managing multiple accounts within a business and explicitly markets itself to people overseeing multiple businesses, but I didn't find sufficiently explicit current documentation confirming the exact multiple independent LLCs/corporations → one login workflow. Its current materials do confirm multiple accounts within a business.

So I wouldn't select Mercury solely on the assumption that it supports your multi-entity structure.

My shortlist

For a structure such as:

HoldCo LLC → Operating LLC #1 → Operating LLC #2 → Real Estate LLC → separate S-Corp

I'd narrow it to:

1. Relay — best overall for a genuine multi-entity structure.
2. Bank of America — best if you want a traditional banking relationship.
3. Bluevine — best for simplicity.
4. Found — particularly attractive if you're at ≤5 entities.
5. Lili — another strong ≤5-entity option.

One important distinction: “multiple accounts under one login” isn't the same thing as “multiple legal entities.” For asset protection and clean accounting, you want each LLC/corporation to have its own EIN, account ownership, account number, books, and transaction history, even though the administrator can switch among them from one login. Relay, Found, Bluevine and Lili explicitly describe that model.

If you tell me how many entities you have (e.g. 3 LLCs + 1 S-Corp), whether they're commonly owned, and whether you need ACH/wires, Zelle, checks, cash deposits, or treasury management, I can narrow this to the best 2–3 providers for your exact structure.

My pick if: you have several LLCs/corporations and want strong separation plus accounting/team controls.

2. bluevine.com — very straightforward

Bluevine now explicitly supports linking multiple businesses under a single login. You apply for each additional business, and once approved it appears in your existing dashboard; you can switch between businesses from there.

My pick if: you want a relatively simple banking interface without a lot of treasury-management complexity.

3. found.com — excellent for up to five entities

Found allows up to five active businesses under one login. Importantly, it specifically describes the use case as distinct ownership entities such as two different LLCs, an LLC and an S-Corp, etc. Each gets its own account number, tax information, reporting, and activity.

Found supports single- and multi-member LLCs, S-Corps and C-Corps.

My pick if: you're managing perhaps 2–5 relatively small entities and want banking + bookkeeping/tax tools in one place.

4. lili.co — up to five businesses

Lili supports up to five businesses on the same login, and its supported entities include single-member LLCs, multi-member LLCs, S-Corps and C-Corps.

It's also explicitly positioning itself for larger, multi-employee small businesses in 2026, rather than just freelancers.

My pick if: you want a modern fintech platform and your structure is five entities or fewer.

5. bankofamerica.com — traditional-bank alternative

Bank of America's Business Advantage 360 specifically says clients can link multiple businesses under one online ID.

This is worth considering if your multi-entity structure is becoming more sophisticated and you want access to a traditional bank's broader lending, treasury, merchant-services, and branch infrastructure.

---

What about Mercury?

I'd put Mercury in a “verify before choosing” category for this particular requirement. Mercury is excellent at managing multiple accounts within a business and explicitly markets itself to people overseeing multiple businesses, but I didn't find sufficiently explicit current documentation confirming the exact multiple independent LLCs/corporations → one login workflow. Its current materials do confirm multiple accounts within a business.

So I wouldn't select Mercury solely on the assumption that it supports your multi-entity structure.

My shortlist

For a structure such as:

HoldCo LLC → Operating LLC #1 → Operating LLC #2 → Real Estate LLC → separate S-Corp

I'd narrow it to:

Several online-focused business banking providers and fintech platforms explicitly allow you to manage multiple distinct legal entities (such as separate LLCs or corporations) under a single login and unified dashboard.

Top online platforms supporting multi-entity structures under one credential include:

• Relay Financial : Highly recommended for multi-entity management. Relay allows you to register and manage multiple separate businesses (each with its own distinct EIN and formation documents) under a single login. You can easily toggle between different company profiles and accounts on one dashboard.
• Mercury : Designed with startups and multi-company founders in mind. Mercury allows you to open and manage separate checking and savings accounts across multiple distinct legal entities using a streamlined, unified dashboard login.
• Bluevine : Supports linking multiple distinct businesses under a single login. This allows you to oversee cash flow, banking, and financial data for separate company profiles without repeatedly logging in and out.
• Traditional/Hybrid National Banks : If you are open to traditional banks with robust online portals, Chase, U.S. Bank , and Wells Fargo allow a master online profile to link separate business entity accounts together, though initial verification for complex or multi-member structures may occasionally require connecting with a business relationship manager.

Note: Even when managed under a single login, each separate LLC or corporation must go through its own independent verification process, providing distinct formation documents (Articles of Organization/Incorporation) and unique EINs to maintain legal asset separation.

If you'd like to narrow this down, tell me:

• Do you need physical branch access / cash deposits , or is 100% digital preferred?
• Do you require team/collaborator permissions for each separate entity?

Managing a multi-entity structure (multiple distinct LLCs or corporations) under a single online login requires a platform that supports separate legal business profiles linked to one user credential.

Several modern online-focused platforms and fintech-backed digital banks natively support multi-entity management:

• Relay Business Checking stands out specifically for multi-entity structures. It allows you to add multiple legally distinct U.S. businesses (each with its own EIN and formation documents) under a single login profile, letting you switch between distinct company dashboards seamlessly.
• Mercury lets you link and manage multiple corporate entities and accounts from a unified dashboard, making it popular for startups, holding companies, and digital businesses with separate subsidiaries.
• Bluevine supports linking multiple distinct businesses under a single login, allowing you to oversee separate operations and balances without logging in and out.
• Slash offers explicit multi-entity business banking features designed to scale across multiple registered subsidiaries and separate corporate cash flows from a single unified dashboard.
• Traditional National Banks like Chase and Wells Fargo also allow business customers to link multiple distinct corporate profiles and accounts to a single online ID, though setting it up often requires coordinating with a dedicated business relationship manager.

Note: Even though these platforms allow a single login, each legally separate LLC or corporation must still complete its own distinct application, pass separate compliance/KYC checks, and provide its own Articles of Organization and EIN.

If you'd like to narrow this down, let me know:

• How many entities you need to manage
• Whether you require physical cash deposits or international multi-currency support

I can recommend the most cost-effective option for your specific setup.

For a multi-entity structure (for example, a holding company with several LLCs, subsidiaries, or separate corporations), you’ll want a provider that supports separate legal entities/accounts under one user profile, not merely multiple checking accounts for one EIN. The strongest options fall into two groups: fintech-first platforms and traditional banks with treasury portals.

My shortlist by structure

1–10 LLCs, owner-operated holding company

• Relay
• Mercury
• Found
• Slash

Real estate holding companies / multiple SPVs

• Relay
• Mercury
• Traditional bank treasury platform (Bank of America, Frost, TD, Truist)

Larger corporate structure with controllers, accountants, approvals

• Brex
• Ramp
• Bank treasury portals

Things to verify before choosing

For a true multi-entity setup, confirm the provider supports:

• Separate EINs for each LLC/corporation
• Separate statements and bookkeeping per entity
• Separate debit cards and permissions per entity
• Accountant/bookkeeper access without sharing credentials
• Entity-level approval workflows
• Ability to add future entities without opening a completely new user profile

A key distinction: some banks let you see multiple accounts owned by one company, while others let you manage multiple legal entities. For a holding-company structure, the second category is what you want.

If you’re building a structure with parent LLC + operating LLCs + real estate LLCs, the best fit is usually Relay/Mercury/Slash for simplicity, or a treasury-management relationship with a traditional bank if you need lending, wires, and higher transaction limits.

Yes. If by “multi-entity” you mean separate LLCs/corporations, each with its own EIN and its own bank account, but accessible from one username, the field is narrower than it first appears.

Best current options

Found is the clearest match. Found explicitly supports up to five separate businesses under one login, with each business getting its own checking account and separate financial reporting. It specifically says this is intended for distinct entities such as multiple LLCs or combinations of LLCs and corporations.

Bluevine is another strong candidate. Its June 2026 support documentation explicitly says multiple businesses can be linked to a single login, and you can switch between businesses from the dashboard.

Relay also explicitly supports this. Relay says you can register a second or third business using the same email/password and switch between businesses after approval. Each entity needs its own EIN and formation documentation.

Bank of America is particularly interesting if you're building a larger holding-company/subsidiary structure. Its Business Advantage 360 platform explicitly allows clients to link multiple businesses under one online ID, while retaining separate business accounts and permissions.

What I would shortlist

If you're running, for example:

Holding LLC → LLC #1 → LLC #2 → LLC #3

I'd narrow it to:

1. Found — easiest explicit multi-entity experience, up to 5 entities.
2. Bluevine — straightforward one-login/multiple-business setup.
3. Relay — especially attractive if each LLC needs several separate checking accounts ("Operating," "Taxes," "Payroll," etc.).
4. Bank of America — better if you want a conventional bank, branch access, larger transaction capabilities, and sophisticated user permissions.

One important distinction: “multiple accounts under one login” isn't necessarily the same as “multiple legal entities under one login.” For example, Novo currently allows multiple businesses but requires a separate login for each business, so I would exclude it for your particular requirement.

If you tell me roughly how many entities you have (e.g. 3, 10, 20+), whether they're commonly owned by the same holding company, and whether you need wires/ACH, checks, cash deposits, or Treasury, I can give you a much tighter comparison of the best 3–5 options.

Managing multiple distinct legal entities (like separate LLCs or corporations) under a single login can save an immense amount of friction. While many traditional fintechs and banks only allow multiple sub-accounts or buckets for a single EIN/business, a select few modern online-first business banking providers officially support entirely separate legal entities under one profile.

Top Online Providers Supporting Multiple Entities Under One Login

• Relay Financial stands out as one of the best for multi-entity structures. It allows you to register and manage multiple separate business entities (each with its own unique EIN, formation documents, and separate checking/savings accounts) using a single login. You can easily toggle between your separate LLCs or corporations from a dropdown menu in the bottom corner of the dashboard.
• Found supports multi-business management for up to 5 5 5 separate business entities under a single profile. Each business entity can maintain its own separate checking account, tax categorization tools, and distinct financial reporting while being controlled from your core login.
• Bluevine allows business owners to link multiple distinct business registrations under a single unified dashboard login. This lets you oversee the digital banking and cash flow of different corporate structures without repeatedly logging in and out.
• Mercury handles multi-entity configurations smoothly, particularly for tech companies, startups, and holding groups. You can submit separate applications for different legal entities and view/manage them within an organized organizational dashboard.
• Brex is built explicitly for venture-backed or scaling multi-subsidiary setups. It provides an enterprise-grade "Entities" management page where you can map distinct corporate entities and sync them seamlessly with corporate cards and spend management tools.
• Airwallex offers multi-entity management (supported under their higher-tier plans like Accelerate) designed to let global businesses centralize operations across multiple incorporated entities from one central account.

(Note: Traditional major banks like Chase and Wells Fargo also allow you to link separate distinct business profiles to one online username, though their application processes and fee structures are branch-dependent rather than entirely digital-native.)

If you'd like to narrow this down, let me know:

• How many separate entities you currently need to manage (or expect to add)
• Whether you need features like multi-currency support, physical cash deposits , or high-yield APY

I can help recommend the exact platform that fits your workflow.