What Are Proprietary Funds in Governmental Accounting?

In governmental accounting, proprietary funds are the fund category used to track activities a government runs like a business, charging fees for goods or services instead of paying for them with tax revenue. They come in two types: enterprise funds, which serve the general public (a municipal water utility is the classic case), and internal service funds, which serve other departments within the same government (a central IT shop or motor pool). Proprietary funds use full accrual accounting, the same basis private companies use, which makes them the corner of government books that looks most familiar to anyone with a corporate finance background.¹

Government accounting divides all activity into three broad fund categories. Governmental funds cover tax-supported services like police, fire, and schools, and their focus is budget compliance. Fiduciary funds hold assets the government manages for others, such as pension assets. Proprietary funds occupy the space in between: activities where the government charges fees and needs to know whether those fees actually cover the cost of the service.²

Enterprise Funds

Enterprise funds account for services a government sells to the general public in exchange for fees. Common examples include water and sewer systems, public transit, government-owned electric or gas utilities, airports, public hospitals, and solid waste operations. What ties them together is that they typically require heavy up-front capital investment and are expected to pay their own way through user charges over time.

GASB requires an enterprise fund in certain situations. The most common trigger is debt structure: when an activity’s borrowing is secured solely by a pledge of the revenue that activity generates, the accounting must be isolated in an enterprise fund so bondholders can see how the pledged revenue stream is performing.¹ Revenue bonds for water systems are the textbook case. An enterprise fund is also required when a law or regulation demands that the full cost of providing the service, including capital costs like depreciation, be recovered through fees.

Even when neither mandatory trigger applies, a government can voluntarily use an enterprise fund any time it prices a service at levels intended to cover costs. Many governments make that choice because enterprise fund reporting produces cleaner data on whether a service is self-sustaining or quietly drawing resources from elsewhere.

Internal Service Funds

Internal service funds handle the other side of proprietary accounting: services one department provides to other departments in the same government. The customers here are not the public but other agencies that share a resource. Centralizing these services in one fund avoids duplication and gives every department an honest picture of what its operations cost.

Common internal service fund activities include:

Fleet management, where a central motor pool buys and maintains vehicles and charges departments a per-mile or per-vehicle rate.
Information technology, where a single department handles hardware, software, and support and bills each agency based on usage.
Self-insurance, where the government pools risk for property damage, liability, or employee health benefits rather than buying commercial insurance.
Printing and mail services, run out of a central shop at a cost-per-job rate.

The goal is cost recovery, not profit. Billing rates are set to break even over time. A large surplus in the fleet fund means departments were overcharged and rates should come down. Chronic deficits mean rates are too low and the fund is being subsidized, which defeats the point of tracking these costs separately.

Accrual Accounting and Why It Matters Here

Proprietary funds use full accrual accounting and the economic resources measurement focus. Revenue is recorded when earned and expenses when incurred, regardless of when cash changes hands, and the balance sheet reports all assets and liabilities, including long-term items like buildings, equipment, and outstanding debt.¹ It is how a private company keeps its books.

The practical consequence is that proprietary fund statements include depreciation. Most other government funds ignore depreciation because they focus on current-year cash and near-cash resources. For a capital-intensive operation like a sewer system, leaving depreciation out would make the service look far cheaper than it is. Including it forces decision-makers to face the real long-term cost of maintaining infrastructure.

Required Financial Statements

GASB Statement No. 34 requires proprietary funds to produce three financial statements.¹

Statement of Net Position

The proprietary fund version of a balance sheet. It lists assets on one side, liabilities on the other, and shows the difference as net position. Current assets and liabilities are separated from long-term ones, and restricted assets appear separately. Net position itself is reported in three categories: net investment in capital assets (infrastructure and equipment minus related debt), restricted (money earmarked for a specific purpose by law or external agreement), and unrestricted.

Statement of Revenues, Expenses, and Changes in Fund Net Position

This is the income statement equivalent. Operating revenues and expenses are separated from non-operating items like interest income or grant revenue, so readers can see whether the core activity is generating enough revenue to cover its costs. Capital contributions, transfers, and special items appear on their own lines below, letting the reader trace exactly how net position changed during the year.

Statement of Cash Flows

This tracks actual cash moving in and out. GASB requires proprietary funds to use the direct method, which lists the major categories of cash received and cash paid rather than starting from net income and backing into the cash figure.¹ That requirement is notable because most private companies use the indirect method. The direct method shows exactly how much cash came from customers, how much went to suppliers, and how much was spent on capital projects.

Cash flows are organized into four categories:

Operating activities: cash from day-to-day service delivery, such as water bill collections and salaries paid.
Noncapital financing activities: cash from grants, subsidies, or borrowing unrelated to capital assets.
Capital and related financing activities: cash spent on infrastructure and equipment, plus proceeds from capital-related debt.
Investing activities: cash from buying or selling investments and earning interest.

That is one more category than the three-part format used in private-sector cash flow statements, and it splits capital-related financing from other borrowing so readers can evaluate infrastructure spending on its own.

How Proprietary Funds Differ from Governmental Funds

The clearest way to see the difference is to think about the question each fund type answers. Governmental funds ask whether the government followed the budget and has enough cash to pay this year’s bills. Proprietary funds ask whether the activity is paying for itself and whether the capital needed to keep it running is being maintained.

Those different questions lead to different accounting. Governmental funds use modified accrual accounting and the current financial resources measurement focus, recording revenue only when it is both measurable and available to pay current obligations.¹ Their balance sheets show only short-term assets and liabilities. A new fire truck bought with general fund money appears as an expenditure in the year it is purchased and then disappears from the governmental fund statements. The truck still exists, but the fund has moved on because its job is to track spendable resources.

A proprietary fund would capitalize that same vehicle on the balance sheet and depreciate it over its useful life. Long-term debt would appear as a liability. Neither approach is wrong. Budget compliance demands a short-term cash lens, while business-type operations need the full accrual treatment to measure whether they are genuinely covering their costs.

How Proprietary Funds Appear in Government-Wide Statements

Beyond the fund-level statements, every government also prepares government-wide financial statements that consolidate everything into two columns: governmental activities and business-type activities. Enterprise fund data flows into the business-type activities column. Internal service fund data is typically folded into governmental activities, because those funds predominantly serve other government departments and their costs ultimately flow to other government programs.¹

Interfund activity, including loans, services between funds, and transfers, is reported separately in the fund-level statements and generally eliminated at the government-wide level so the same dollar is not counted twice. A subsidy transfer from the general fund to an enterprise fund shows up in both fund statements but washes out in the consolidated view. Readers get both a fund-by-fund detail view and a big-picture consolidated view of the government’s finances.

1
GASB. Summary – Statement No. 34
2
National Center for Education Statistics. Financial Accounting for Local and State School Systems 2014 Edition – Chapter 4 Governmental Accounting Fund Structure