Senior debt

Author:

The Carta Team

Read time:

4 minutes

Published date:

August 14, 2025

Learn about senior debt and its relationship to capital structure. Explore how senior debt compares to junior debt, mezzanine debt, and equity.

What is senior debt?

Senior debt is a form of debt financing. It refers to loans or credit facilities that must be repaid before any other forms of debt or equity in the event of liquidation or insolvency. Senior debt is typically secured by company assets such as property, equipment, or receivables, making it a lower-risk option for lenders and a low-cost source of capital for borrowers. This type of debt is commonly used by private companies and private equity fund managers to finance expansions, mergers and acquisitions, or reorganizations.

Features of senior debt

Senior debt usually has first claim to a company’s assets and cash flows because it’s often backed by collateral. It usually comes with lower interest rates compared to subordinated debt or mezzanine financing, reflecting its reduced risk.

Senior debt agreements often include strict financial covenants—such as leverage and interest coverage ratios—to protect senior lenders. These include revolving credit facilities, term loans, and asset-backed loans, with maturities ranging from three to seven years.

Benefits of senior debt

Senior debt offers distinct advantages for both borrowers and lenders, making it a foundational element in many financing strategies.

Benefits for borrowers

For borrowers, senior debt provides access to capital at a lower cost due to its secured and prioritized status. It allows companies to leverage their assets without giving up ownership, unlike equity financing. The presence of senior debt can also enhance their ability to borrow more capital with minimal cost, thereby enabling companies to fund expansion or acquisitions while maintaining control.

Benefits for lenders

Lenders benefit from the reduced risk associated with senior debt’s priority in repayment and collateral backing. The strict covenants and regular monitoring requirements further protect their interests, making senior debt an attractive investment for banks, private credit funds, and other institutional lenders (such as pension funds or insurance companies).

Senior debt in private markets: Contexts and examples

In private markets, senior debt serves as a crucial financing tool for various transactions. It is commonly used in leveraged buyouts (LBOs), where a private equity firm uses a significant amount of borrowed money to acquire a company. In this scenario, the senior debt provides the foundation of the financing package and is typically lent by institutional investors like private credit funds, banks, and insurance companies.

Another key use case is in venture debt deals. This type of financing is provided to high-growth, venture-backed companies that need capital but do not want to dilute their equity ownership. The senior debt in these deals is often provided by specialty finance companies or venture debt funds and may be used to extend a company’s cash runway between equity rounds or to fund specific growth initiatives. For example, a late-stage startup might take on senior venture debt to fund a large marketing campaign without having to sell more shares to investors.

It's important to note that, in many venture debt scenarios, the debt is not secured by traditional hard collateral like equipment or real estate. Instead, the lender's security is primarily their senior claim on the company's assets, which may include intellectual property or future cash flows.

Relationship to capital structure

Senior debt plays a critical role in shaping a company’s capital structure, sitting at the top of the capital stack and influencing how much risk and return investors can expect.

Senior debt vs. junior debt

Senior debt differs from junior debt (or subordinated debt) in terms of repayment priority and risk. In a liquidation scenario, senior debt holders are paid first, while junior debt is repaid only after senior obligations have been met. As a result, junior debt typically carries higher interest rates and less stringent covenants to compensate for the increased risk.

Senior debt vs. mezzanine debt

Mezzanine debt occupies a middle position between senior debt and equity. While it offers higher returns than senior debt, it also comes with greater risk and often includes features like equity warrants. This is a key differentiator, as these warrants allow lenders to convert a portion of the debt into equity, giving them an opportunity to participate in the company's growth. This mechanism fundamentally distinguishes mezzanine debt from most senior debt, which is strictly a loan without any ownership component.

Senior debt, by contrast, is less expensive, making it the preferred choice for companies seeking to reduce borrowing costs and protect against risk.

Senior debt vs. junior debt vs. mezzanine debt

Senior debt vs. equity

The fundamental difference between senior debt and equity is that one is a loan and the other is a form of ownership. Senior debt is a loan that requires fixed repayments and does not dilute ownership or control. While it provides tax-deductible interest payments, it also increases the company's financial obligations.

Equity, on the other hand, provides greater flexibility at the cost of shared ownership and potentially higher overall capital costs. Issuing equity means selling a portion of the company, and investors expect a return on their investment, which is paid out from the company's profits, not from a fixed payment schedule.