I run more than one business - should they share one set of books or have separate ones?

What makes two ventures one set of records or two

The FASB conceptual framework describes a reporting entity as a circumscribed area of economic activities that can be represented by general purpose financial reports useful to existing and potential investors, lenders and other resource providers in deciding about providing resources to the entity. (jurisdiction: United States (FASB Conceptual Framework for financial reporting under US GAAP), entity_scope: reporting entities that produce general purpose financial reports, accounting_basis: US GAAP conceptual framework (concepts, not standards-level requirements), conditions: a description in a Concepts Statement, not a recognition or measurement requirement)

“RE4. A reporting entity is a circumscribed area of economic activities that can be represented by general purpose financial reports that are useful to existing and potential investors, lenders, and other resource providers in making decisions about providing resources to the entity.”

The document states three features of a reporting entity: economic activities have been conducted; those economic activities can be distinguished from those of other entities; and the financial information in general purpose financial reporting faithfully represents the economic activities conducted within the circumscribed area and is useful in decisions about providing resources to the reporting entity. (jurisdiction: United States (FASB Conceptual Framework for financial reporting under US GAAP), entity_scope: reporting entities that produce general purpose financial reports, accounting_basis: US GAAP conceptual framework (concepts, not standards-level requirements), conditions: features of the concept, not a compliance test at the standards level)

“RE5. A reporting entity has three features: a. b. c. Economic activities have been conducted. Those economic activities can be distinguished from those of other entities. The financial information in general purpose financial reporting faithfully represents the economic activities conducted within the circumscribed area and is useful in making decisions about providing resources to the reporting entity.”

For the purpose of identifying a reporting entity, the existence of a legal entity is not necessary, and a reporting entity can include more than one entity or can be a portion of an entity. (jurisdiction: United States (FASB Conceptual Framework for financial reporting under US GAAP), entity_scope: identification of the reporting entity for general purpose financial reporting, accounting_basis: US GAAP conceptual framework (concepts, not standards-level requirements), conditions: concerns identification of a reporting entity for general purpose financial reporting; the text says nothing about legal or tax registration requirements)

“The existence of a legal entity is not necessary to identify the reporting entity. The reporting entity can include more than one entity, or it can be a portion of an entity.”

Combined financial statements can appropriately depict two or more entities that are under common control or common management, including circumstances in which a parent-subsidiary relationship does not exist. (jurisdiction: United States (FASB Conceptual Framework for financial reporting under US GAAP), entity_scope: two or more entities under common control or common management, accounting_basis: US GAAP conceptual framework (concepts, not standards-level requirements), conditions: possibility ('can'); circumstances listed are inclusive, not exhaustive)

“RE14. Combined financial statements can appropriately depict two or more entities that are under common control or common management, including circumstances in which a parent-subsidiary relationship does not exist.”

Partly established. Established: what makes two ventures a single reporting entity rather than two (S02, S03, S05, S06). Missing: why entity identity governs whether accounting records must be maintained separately.

The decision follows the identity of the ventures, not preference

Identifying the reporting entity in a specific situation requires considering the boundary of the economic activities that have been conducted. (jurisdiction: United States (FASB Conceptual Framework for financial reporting under US GAAP), entity_scope: identification of a reporting entity in a specific situation, accounting_basis: US GAAP conceptual framework (concepts, not standards-level requirements))

“RE7. Identifying the reporting entity in a specific situation requires considering the boundary of the economic activities that have been conducted.”

See For the purpose of identifying a reporting entity, the existence of a legal entity is not necessary, and a reporting entity can include more than one entity or can be a portion of an entity.

The Board concluded that although a legal entity is a circumscribed area of economic activities that could represent a reporting entity, the legal form or structure of an entity should not exclusively dictate whether a circumscribed area of economic activities represents a reporting entity. (jurisdiction: United States (FASB Conceptual Framework for financial reporting under US GAAP), entity_scope: identification of reporting entities for general purpose financial reporting, accounting_basis: US GAAP conceptual framework (concepts, not standards-level requirements), conditions: Basis for Conclusions reasoning; concerns reporting-entity identification, not legal or tax status)

“BC7. The Board concluded that while a legal entity is a circumscribed area of economic activities that could represent a reporting entity, the legal form or structure of an entity should not exclusively dictate whether a circumscribed area of economic activities represents a reporting entity.”

As an illustrative example, the document notes that a sole proprietorship is not legally separate from its owner yet may prepare general purpose financial reports for its circumscribed area of economic activities. (jurisdiction: United States (FASB Conceptual Framework for financial reporting under US GAAP), entity_scope: sole proprietorships, cited as an example, accounting_basis: US GAAP conceptual framework (concepts, not standards-level requirements), conditions: given as an example in the Basis for Conclusions, not as a requirement)

“For example, a sole proprietorship is not legally separate from its owner; however, a sole proprietorship may prepare general purpose financial reports for its circumscribed area of economic activities.”

Partly established. Established: what makes two ventures one entity or two for this purpose (S02). Missing: that the record-set decision follows the legal and tax identity of the ventures.

What each arrangement can and cannot produce

Parent-only financial statements present subsidiaries as investments and do not depict the subsidiaries' resources, claims to those resources, or changes in those resources and claims during the period; consequently they do not faithfully represent the operating results, financial position and capital structure of the parent and its subsidiaries as a single economic unit. (jurisdiction: United States (FASB Conceptual Framework for financial reporting under US GAAP), entity_scope: parent entities with subsidiaries, accounting_basis: US GAAP conceptual framework (concepts, not standards-level requirements))

“Parent-only financial statements present subsidiaries as investments and do not depict the subsidiaries’ (a) resources, (b) claims to those resources, and (c) changes in those resources and claims during the period. Consequently, parent-only financial statements do not faithfully represent the operating results, financial position, and capital structure of the parent and its subsidiaries as a single economic unit.”

For a portion of a larger entity to prepare general purpose financial reports, including a full set of financial statements, it must identify the economic activities of its circumscribed area, and decisions on which economic activities should be attributable to that portion should result in reports that faithfully represent the portion's financial position and performance. (jurisdiction: United States (FASB Conceptual Framework for financial reporting under US GAAP), entity_scope: a portion of a larger entity preparing general purpose financial reports, accounting_basis: US GAAP conceptual framework (concepts, not standards-level requirements), conditions: conditional on the portion preparing general purpose financial reports)

“RE12. For a portion of a larger entity to prepare general purpose financial reports, including a full set of financial statements, it must identify the economic activities of its circumscribed area. Decisions on which economic activities should be attributable to the portion of a larger entity should result in general purpose financial reports that provide a faithful representation of the portion of the larger entity’s financial position and performance.”

Based on the needs of intended users, a portion of an entity may prepare financial reports that do not include a full set of financial statements, and in those circumstances the financial reports are special purpose. (jurisdiction: United States (FASB Conceptual Framework for financial reporting under US GAAP), entity_scope: a portion of an entity preparing financial reports, accounting_basis: US GAAP conceptual framework (concepts, not standards-level requirements), conditions: depends on the needs of intended users)

“RE13. Based on the needs of intended users, the portion of an entity may prepare financial reports that do not include a full set of financial statements. In those circumstances, the financial reports are special purpose.”

To achieve the objective of general purpose financial reporting, a portion of a larger entity must prepare general purpose financial reports, including a full set of financial statements, that faithfully represent the economic activities of its circumscribed area, including activities that have to be allocated to the portion, such as corporate overhead activities. (jurisdiction: United States (FASB Conceptual Framework for financial reporting under US GAAP), entity_scope: a portion of a larger entity seeking to achieve the objective of general purpose financial reporting, accounting_basis: US GAAP conceptual framework (concepts, not standards-level requirements), conditions: corporate overhead given as an example of allocated activities (list open, 'such as'))

“To achieve the objective of general purpose financial reporting, the portion of a larger entity must prepare general purpose financial reports, including a full set of financial statements, that faithfully represent the economic activities of its circumscribed area, including activities that have to be allocated to the portion of the entity, such as corporate overhead activities.”

Not established from an authoritative source.

Separate ledgers and one ledger split by a tracking dimension, side by side

A portion of a larger entity, such as a subsidiary, branch or division, can represent a circumscribed area of economic activities and can consequently meet the description and features of a reporting entity in paragraphs RE4 and RE5. (jurisdiction: United States (FASB Conceptual Framework for financial reporting under US GAAP), entity_scope: portions of a larger entity, examples given being subsidiary, branch or division (list open, introduced by 'such as'), accounting_basis: US GAAP conceptual framework (concepts, not standards-level requirements), conditions: possibility ('can'), conditional on meeting the description and features in RE4 and RE5)

“RE11. A portion of a larger entity, such as a subsidiary, branch, or division, can represent a circumscribed area of economic activities and, consequently, meet the description and features of a reporting entity in paragraphs RE4 and RE5.”

A portion of a larger entity would still need to consolidate any of its own subsidiary relationships in order to meet the objective of general purpose financial reporting. (jurisdiction: United States (FASB Conceptual Framework for financial reporting under US GAAP), entity_scope: a portion of a larger entity that has its own subsidiary relationships, accounting_basis: US GAAP conceptual framework (concepts, not standards-level requirements), conditions: applies where the portion has its own subsidiary relationships and seeks to meet the objective of general purpose financial reporting)

“A portion of a larger entity would still need to consolidate any of its own subsidiary relationships to meet the objective of general purpose financial reporting, consistent with paragraph RE8.”

See For a portion of a larger entity to prepare general purpose financial reports, including a full set of financial statements, it must identify the economic activities of its circumscribed area, and decisions on which economic activities should be attributable to that portion should result in reports that faithfully represent the portion's financial position and performance.

The Board acknowledges that in some cases there are practical complexities in identifying the assets, liabilities and operations of a portion of an entity, particularly for items that are allocated to that portion. (jurisdiction: United States (FASB Conceptual Framework for financial reporting under US GAAP), entity_scope: a portion of a larger entity, accounting_basis: US GAAP conceptual framework (concepts, not standards-level requirements), conditions: hedged as occurring 'in some cases')

“BC11. The Board acknowledges that in some cases there are practical complexities in identifying the assets, liabilities, and operations of a portion of an entity, specifically for items that are allocated to the portion of the entity.”

Partly established. Established: what separate ledgers are (S16). Missing: what a shared ledger with a segmentation dimension is; what each arrangement can and cannot produce for a reader of the records.

When one ledger with a tracking dimension is enough, and when it is not

See A portion of a larger entity, such as a subsidiary, branch or division, can represent a circumscribed area of economic activities and can consequently meet the description and features of a reporting entity in paragraphs RE4 and RE5.

See For a portion of a larger entity to prepare general purpose financial reports, including a full set of financial statements, it must identify the economic activities of its circumscribed area, and decisions on which economic activities should be attributable to that portion should result in reports that faithfully represent the portion's financial position and performance.

See Based on the needs of intended users, a portion of an entity may prepare financial reports that do not include a full set of financial statements, and in those circumstances the financial reports are special purpose.

See The Board acknowledges that in some cases there are practical complexities in identifying the assets, liabilities and operations of a portion of an entity, particularly for items that are allocated to that portion.

Not established from an authoritative source.

Filing and reporting obligations that require records kept at the level of one entity

Not established from an authoritative source.

When a lender, investor, franchisor or insurer requires reporting on one venture alone

Not established from an authoritative source.

Outside requirements that remove the choice

Not established from an authoritative source.

The order the criteria bind: identity, then outside obligations, then cost

Not established from an authoritative source.

How accounting systems handle more than one business

In QuickBooks Online, each company a user creates requires its own separate paid subscription. (jurisdiction: United States (en-US QuickBooks Online help edition), entity_scope: Each QuickBooks Online company created by the user, platform: QuickBooks Online, platform_edition: US edition; article listed for QuickBooks Online Advanced, Plus, Simple Start, Essentials, Lite, Free, Intuit Enterprise Suite, QuickBooks Solopreneur Plus, effective_from: 2026-08-05 (page last updated))

“Each company you create requires its own separate paid subscription.”

Companies under one QuickBooks Online account share a sign-in, but their data remains completely separate. (jurisdiction: United States (en-US QuickBooks Online help edition), entity_scope: Multiple QuickBooks Online companies under a single account, platform: QuickBooks Online, platform_edition: US edition, effective_from: 2026-08-05 (page last updated))

“Although your companies share a sign-in, their data remains completely separate.”

Users set up in one QuickBooks Online company do not automatically have access to the other companies, and must be invited to each company separately. (jurisdiction: United States (en-US QuickBooks Online help edition), entity_scope: Users of multiple QuickBooks Online companies under one account, platform: QuickBooks Online, platform_edition: US edition, effective_from: 2026-08-05 (page last updated))

“Users set up in one company do not automatically have access to others. You must invite them to each company separately.”

Bank and credit card accounts connected to one QuickBooks Online company are not visible in another company, and accounts must be connected separately for each company file. (jurisdiction: United States (en-US QuickBooks Online help edition), entity_scope: Multiple QuickBooks Online company files under one account, platform: QuickBooks Online, platform_edition: US edition, effective_from: 2026-08-05 (page last updated))

“Bank and credit card accounts connected to one company are not visible in another. You must connect accounts separately for each file.”

Zoho Books permits a user to create and manage more than one organization within Zoho Books. (jurisdiction: United States (US-EN edition of the Zoho Books knowledge base), entity_scope: Zoho Books users/account holders, platform: Zoho Books, platform_edition: US-EN edition)

“You can create and manage multiple organizations in Zoho Books.”

When creating an organization, Zoho Books offers the choice of adding a new organization or cloning an existing one. (jurisdiction: United States (US-EN edition of the Zoho Books knowledge base), entity_scope: Zoho Books users creating an additional organization, platform: Zoho Books, platform_edition: US-EN edition, conditions: web interface as described on this undated page)

“Choose to either add a new organization or clone an existing one.”

Zoho Books states that creating a new organization comes with a 14-day free trial of the Premium plan. (jurisdiction: United States (US-EN edition of the Zoho Books knowledge base), entity_scope: Zoho Books users who create a new organization, platform: Zoho Books, platform_edition: US-EN edition, conditions: applies on creation of a new organization; page carries no last-updated date)

“Once you create a new organization, you’ll get a 14-day free trial of the Premium plan.”

After the 14-day trial of a newly created organization ends, the user will have to subscribe to a plan for it separately, chosen according to business needs. (jurisdiction: United States (US-EN edition of the Zoho Books knowledge base), entity_scope: Zoho Books users whose newly created organization's trial has ended, platform: Zoho Books, platform_edition: US-EN edition, conditions: after the 14-day free trial ends; page carries no last-updated date)

“After the trial ends, you will have to subscribe to a plan based on your business needs separately.”

Not established from an authoritative source.

Which taxpayer identifier belongs with which set of books

The IRS states that, in general, a new EIN is needed when the entity's ownership or structure changes; the statement is hedged with "in general" and the page then sets out entity-type specific cases. (jurisdiction: United States (federal tax administration by the IRS), entity_scope: Entities that hold or need an Employer Identification Number, conditions: stated as a general rule ("in general"), qualified by the entity-type lists that follow)

“You need a new EIN, in general, when you change your entity’s ownership or structure.”

For sole proprietors, the IRS lists changing business name or locations, and owning multiple businesses, among the situations in which no new EIN is needed — i.e. a sole proprietor who owns several businesses is not required on that ground alone to obtain an additional EIN. (jurisdiction: United States (federal tax administration by the IRS), entity_scope: Sole proprietors, conditions: the page states only that a new EIN is not needed on these grounds; it states no rule about bank accounts or bookkeeping records)

“You don’t need a new EIN if you: Change your business name or locations. Own multiple businesses.”

For corporations (including tax-exempt organizations), the IRS lists among the situations needing no new EIN: changing business name or location, declaring bankruptcy, being a division of a corporation, being the surviving corporation after a merger, electing S corporation taxation, reorganizing to change only identity or location, and converting at state level without changing business structure. Notably a division of a corporation is not required on that ground to have its own EIN. (jurisdiction: United States (federal tax administration by the IRS), entity_scope: Corporations, including tax-exempt organizations, conditions: state-level conversion case applies only where the business structure does not change)

“You don’t need a new EIN if you: Change your business name or location. Declare bankruptcy. Are a division of a corporation. Are the surviving corporation after a corporate merger. Choose to be taxed as an S corporation. Reorganize to change only your identity or location. Convert at the state level and don’t change your business structure.”

For LLCs, the IRS lists among the situations needing no new EIN: changing name or location; reporting income tax as a branch or division of another entity while having no employees and owing no excise tax; converting a partnership to an LLC classified as a partnership; changing the tax election to a corporation or S corporation; and using the owner's sole proprietor EIN for a single-member LLC that is not taxed as a corporation or S corporation and has no employees and owes no excise tax. (jurisdiction: United States (federal tax administration by the IRS), entity_scope: Limited liability companies, including single-member LLCs owned by a sole proprietor, conditions: branch/division case conditioned on having no employees and owing no excise tax; sole proprietor EIN case conditioned on not choosing corporation or S corporation taxation and on having no employees and owing no excise tax)

“You don’t need a new EIN if you: Change your name or location. Report income tax as a branch or division of another entity and you don’t have employees or owe excise tax. Convert a partnership to an LLC classified as a partnership. Change your tax election to a corporation or an S corporation. Use your sole proprietor EIN for your single-member LLC and don’t choose to be taxed as a corporation or an S corporation and don’t have employees or owe excise tax.”

Partly established. Established: which bank accounts belong with which record set where one owner runs several ventures (S18); which taxpayer identifier belongs with which record set (S24, S25, S26). Missing: what each entity's records must therefore reflect.

What follows in practice once you choose

See For sole proprietors, the IRS lists changing business name or locations, and owning multiple businesses, among the situations in which no new EIN is needed — i.e. a sole proprietor who owns several businesses is not required on that ground alone to obtain an additional EIN.

See For LLCs, the IRS lists among the situations needing no new EIN: changing name or location; reporting income tax as a branch or division of another entity while having no employees and owing no excise tax; converting a partnership to an LLC classified as a partnership; changing the tax election to a corporation or S corporation; and using the owner's sole proprietor EIN for a single-member LLC that is not taxed as a corporation or S corporation and has no employees and owes no excise tax.

See In QuickBooks Online, each company a user creates requires its own separate paid subscription.

See Users set up in one QuickBooks Online company do not automatically have access to the other companies, and must be invited to each company separately.

See Bank and credit card accounts connected to one QuickBooks Online company are not visible in another company, and accounts must be connected separately for each company file.

See After the 14-day trial of a newly created organization ends, the user will have to subscribe to a plan for it separately, chosen according to business needs.

What is lost when separate entities share one ledger

Identifying the boundaries of the economic activities is necessary in order to faithfully present the reporting entity's financial information in general purpose financial reporting. (jurisdiction: United States (FASB Conceptual Framework for financial reporting under US GAAP), entity_scope: reporting entities preparing general purpose financial reporting, accounting_basis: US GAAP conceptual framework (concepts, not standards-level requirements))

“RE6. Identifying the boundaries of the economic activities is necessary to faithfully present the reporting entity’s financial information in general purpose financial reporting.”

See Parent-only financial statements present subsidiaries as investments and do not depict the subsidiaries' resources, claims to those resources, or changes in those resources and claims during the period; consequently they do not faithfully represent the operating results, financial position and capital structure of the parent and its subsidiaries as a single economic unit.

See The Board acknowledges that in some cases there are practical complexities in identifying the assets, liabilities and operations of a portion of an entity, particularly for items that are allocated to that portion.

See To achieve the objective of general purpose financial reporting, a portion of a larger entity must prepare general purpose financial reports, including a full set of financial statements, that faithfully represent the economic activities of its circumscribed area, including activities that have to be allocated to the portion, such as corporate overhead activities.

Not established from an authoritative source.

Required authority: authoritative professional or accounting standard, primary regulator or government. Highest achieved: authoritative professional or accounting standard, high quality professional secondary reference.