Debt Affordability Is a Governance Question

Access Is Not Affordability

Most California public agencies can borrow. Investment-grade ratings are common. The tax-exempt bond market is deep, and lenders compete for public agency paper. When a governing board asks whether it can issue debt to fund a capital project, the answer is usually yes.

That is the wrong question.

The right question is whether the agency can afford the obligation not just in the first year of repayment, but over the full term of the debt, alongside everything else the agency owes. Debt service is a fixed, long-term claim on public revenues. It competes with pension costs, staffing obligations, capital maintenance, and service delivery for the same limited budget dollars. A financing decision that looks manageable in isolation can create structural pressure when it interacts with other fixed costs that are also growing.

Market access and fiscal affordability are two different conditions. Confusing them is one of the most common governance failures in public finance.

Capacity vs. Affordability: Two Different Ceilings

Public finance practitioners distinguish between debt capacity and debt affordability. Both matter. They are not the same thing.

An agency at 40% of its legal debt limit may still be over-leveraged if its pension costs are rising, its reserves are thin, and its revenues are constrained. Conversely, an agency approaching its statutory limit may carry that debt comfortably if its fixed cost structure is sound and its fiscal model is strong. The limit tells you what is permitted. Affordability analysis tells you what is prudent.

What Debt Actually Costs

The coupon rate on a bond is the most visible cost of borrowing. It is not the complete picture. Governing boards should understand the full cost structure of any financing before approving it.

Direct costs include interest over the life of the bonds, issuance expenses (underwriter discount, bond counsel, financial advisor, printing, and rating fees), and the ongoing compliance costs that persist for the life of the debt: continuing disclosure filings, arbitrage rebate analysis, annual covenant monitoring, and CDIAC reporting. For a $10 million financing, these costs are meaningful.

The indirect costs are harder to see but often more consequential. Every dollar of debt service is a dollar that cannot fund a capital project, absorb a pension cost increase, or go into reserves. The fixed cost structure of public agencies, pension obligations plus debt service plus baseline staffing, leaves limited flexibility for service delivery when revenues soften. Each new financing narrows that flexibility further.

The cost of borrowing is not the interest rate. It is the sum of all future payments, minus the flexibility they foreclose.

How Debt Competes With Everything Else

Public agency budgets have a fixed cost structure that is largely non-discretionary in the short term. Pension contributions, existing debt service, OPEB obligations, and baseline staffing collectively consume a large share of revenues before a single discretionary decision is made.

When pension costs are rising and the agency adds new debt service, both claims are growing simultaneously. An agency that commits 12% of general fund revenues to debt service and 18% to pension contributions has 30% of its revenues pre-committed to fixed obligations before accounting for staffing, operations, or capital maintenance. If revenues soften by 10%, the margin available for everything else shrinks dramatically.

This interaction is the core reason debt affordability cannot be evaluated in isolation. A financing that looks affordable on its own may not be affordable in the context of the agency's full fiscal model. The relevant question is not "can we cover this payment?" but "can we cover this payment alongside every other fixed obligation we carry, across a range of revenue scenarios, for the next twenty years?"

General Fund Debt vs. Enterprise Debt: Two Different Conversations

Not all public debt is structurally equivalent. The affordability analysis for a general fund financing and an enterprise fund financing begins in different places, uses different metrics, and carries different governance implications. Boards that oversee both types of debt should understand the distinction clearly.

General fund debt is repaid from the same revenue pool that funds staffing, services, and pension contributions. It competes directly for budget dollars alongside every other fixed obligation. The relevant question is whether the agency can service the obligation within the constraints of its general fund across the full term, while pension costs continue on their own trajectory and revenues remain subject to economic volatility. General obligation bonds, most certificates of participation, and lease-leaseback structures are typically general fund obligations. Each one adds to the fixed cost structure that the operating budget must absorb.

Enterprise fund debt is repaid from enterprise revenues: utility rates, connection fees, and service charges rather than general taxes. Water and wastewater revenue bonds are the most common example. The enterprise fund is designed to be self-supporting. Rates are set to cover operating costs, debt service, and capital replacement without a general fund subsidy. The relevant affordability metric is not debt service as a percentage of general fund revenues but the debt service coverage ratio: net revenues available for debt service divided by annual debt service. Bond covenants and rating agency guidance typically require coverage of at least 1.25x, and stronger agencies carry higher cushion.

The enterprise fund's advantage is direct revenue control. An agency can set rates to cover its costs in a way that a general fund cannot simply increase property or sales tax receipts on demand. But that control is constrained by Proposition 218, which requires notice and majority protest processes before rate increases take effect, and by the practical limits of ratepayer capacity. Affordability analysis for enterprise debt must therefore assess not only whether rates could theoretically cover the obligation, but whether the rate trajectory required to maintain coverage is realistic given Prop 218 timing, political conditions, and the economic circumstances of the service area. A coverage ratio that works at current rates may require a 12% increase within three years to remain intact as capital borrowing grows. That is a governance question, not an arithmetic one.

The two fund types interact in ways that boards sometimes overlook. Pension obligations do not stop at the general fund boundary. Enterprise funds that participate in CalPERS carry UAL exposure within their rate structure: pension cost increases compete with debt service and capital reserves inside the enterprise fund the same way they compete with services and staffing inside the general fund. Some financing structures also blur the line. Certificates of participation backed by enterprise assets may carry implicit general fund exposure depending on the lease structure and legal covenants. Boards should know which fund actually bears the obligation and whether any cross-fund backstop exists, stated or implied.

Common Metrics and Their Limits

Rating agencies and finance professionals use standardized ratios to evaluate debt burden. The relevant set of metrics differs depending on whether the debt is a general fund or enterprise fund obligation.

For general fund debt, the primary metric is debt service as a percentage of general fund revenues. Industry guidance treats 10% as a caution threshold and 15% as a practical ceiling, though the right level for any specific agency depends on revenue stability, fixed cost structure, and pension trajectory. Net debt per capita and debt as a percentage of assessed valuation are used to compare burden across agencies and over time. These ratios are useful benchmarks. They are not affordability analysis.

For enterprise fund debt, the primary metric is the debt service coverage ratio: net revenues available for debt service divided by annual debt service. A 1.25x minimum is typical for investment- grade credit, with stronger credits carrying 1.50x or higher. Days cash on hand, rate covenant compliance, and capital reserve adequacy round out the picture for enterprise issuers.

What neither set of ratios captures: the trajectory of pension costs over the debt's term; the interaction between fixed cost growth and revenue volatility; the adequacy of reserves post- issuance; remaining capital needs and whether future borrowing will compound the obligation; and the total fixed cost burden rather than debt service in isolation. A ratio that looks acceptable today may look problematic in five years if pension costs are escalating and revenues are flat. Affordability analysis requires a dynamic view of the fiscal model, not a static snapshot.

The Five Affordability Questions

Before approving a financing, a governing board should be able to answer five questions with specificity. These are not procedural requirements. They are the substance of what it means to govern a debt decision responsibly.

The Useful Life Rule and What It Rules Out

The principle that debt should fund assets with useful lives exceeding the loan term is one of the oldest disciplines in public finance. It exists for a clear reason: the benefits of the financed asset should extend at least as long as the obligation to pay for it. When they do not, the agency is in the position of paying for something it no longer has.

This principle has implications that boards sometimes miss. It means that issuing long-term debt to fund deferred maintenance programs requires careful analysis of what is actually being financed: rehabilitation that extends asset life, or catch-up spending that simply restores a baseline that should have been maintained all along. It means that financing technology infrastructure with a 20-year term requires an honest assessment of how long that infrastructure will actually be in service. And it means that using long-term debt to close a current-year budget gap, a practice that is occasionally proposed under other names, is fiscally indefensible regardless of market access.

Three Ways to Think About the Decision

Debt decisions are not binary. The question is not simply borrow or do not borrow. Governing boards benefit from thinking about financing decisions across three distinct frames.

Why a Debt Policy Changes the Conversation

Governing boards that establish a formal debt management policy change the terms of the conversation before the pressure to borrow arrives. Without a policy, every financing decision is made fresh, under whatever deadline or capital pressure exists at the time. With a policy, the board has pre-committed to the questions it will ask, the metrics it will apply, and the standards it will hold.

A well-constructed debt management policy does several things at once. It establishes specific affordability targets: debt service as a percentage of revenues, net debt per capita, and overall debt burden limits. It sets refinancing standards that require demonstrated present value savings before a refunding proceeds. It imposes useful life requirements for financed assets. It specifies reserve requirements that must be met before a financing is approved and maintained after closing. And it defines the decision authority structure: what staff can recommend, what requires board approval, and under what conditions a proposed financing warrants independent review.

The policy matters most when the pressure to borrow is strongest. When a project is popular, a deadline is approaching, or a funding opportunity exists, the institutional bias is toward approval. A policy that requires specific affordability analysis, rather than just staff recommendation, is the mechanism that keeps governance standards intact under pressure.

A debt policy matters most when the pressure to borrow is strongest. That is precisely when it is most likely to be ignored without one.

What Boards Should Be Asking

The following questions belong in every debt-related board discussion, whether the item is a new money financing, a refunding, or an authorization to explore a capital structure option. They are not technical questions. They are governance questions that any board member should be equipped to raise.

The Governance Takeaway

Debt markets are efficient. They will price and sell bonds for most California public agencies regardless of whether those agencies have conducted rigorous affordability analysis. The market's willingness to lend is not evidence that the financing fits the fiscal model.

Governing boards are not obligated to borrow because they can. They are obligated to evaluate whether borrowing serves the agency's long-term fiscal interests, at this size, on these terms, now, given everything else the agency owes and everything it still needs to fund.

That evaluation requires a current long-term forecast, a clear view of the fixed cost structure, an honest assessment of reserve adequacy, and independent advice. It requires a policy framework that establishes the standards before the pressure to approve arrives. And it requires a board that treats debt affordability as a governance responsibility rather than a staff determination.

The question is not whether debt is available. It is whether the obligation fits.