Subordinated Debt

Subordinated debt, also called junior debt or "sub debt", is borrowing that ranks below other debt of the same borrower when claims are paid out in a liquidation or insolvency. Subordinated creditors are paid only after senior creditors have been repaid in full, though still ahead of shareholders. Because they carry more risk, subordinated loans and bonds pay higher interest than senior debt from the same issuer.

The idea is one part of the wider subject of debt seniority, which sets the order in which claims are met. Subordinated debt is issued by companies to add borrowing capacity behind their bank lenders, by private equity-backed borrowers as mezzanine financing, and above all by banks and insurers, for whom certain subordinated instruments count as regulatory capital.

Imagine a business that closes down owing money to several people. Its assets are sold, and the cash is handed out in a queue. Lenders at the front of the queue are paid first. Subordinated lenders have agreed to stand further back. They receive something only if there is money left once everyone ahead of them has been paid.

Nobody would accept a place near the back without a reward, so subordinated lenders charge more interest while the business is healthy. In good times they simply earn a better return. In bad times they are much more likely to lose most or all of what they lent. Shareholders stand behind them, which is why subordinated debt is often described as sitting between ordinary loans and shares.

Debt can become junior in two main ways:

• Contractual subordination. The lender agrees in the loan agreement, bond terms or a separate intercreditor or subordination agreement that its claim will rank behind named senior debt. Payments on the junior debt may be blocked while senior debt is in default.
• Structural subordination. The debt is owed by a holding company whose only assets are shares in operating subsidiaries. Creditors of those subsidiaries are paid out of the subsidiaries' assets first, so the holding company's lenders are effectively junior even without any agreement.

Subordinated debt is usually unsecured, but not always. Second-lien loans hold security over the same assets as senior secured debt yet agree to be paid from those assets only after the first-lien lenders. Holders of ordinary unsecured senior debt rank equally with each other and ahead of contractually subordinated creditors.

Under Basel III, the global standards set by the Basel Committee on Banking Supervision, banks can count certain subordinated debt as Tier 2 capital. To qualify, the instrument must be subordinated to depositors and general creditors, have an original maturity of at least five years and not be redeemable by the holder early. Its value as capital is reduced on a straight-line basis in the final five years before maturity.

Additional Tier 1 (AT1) instruments rank lower still. They are perpetual and must be written down or converted into equity when a bank's capital falls below a trigger. Both AT1 and Tier 2 instruments can also be written down or converted by resolution authorities under bail-in powers. The risk became concrete in March 2023, when Swiss authorities ordered Credit Suisse's AT1 bonds, about CHF 16 billion, to be written down to zero as part of its takeover by UBS, even though shareholders kept some value. In October 2025 Switzerland's Federal Administrative Court ruled that the write-down was unlawful; FINMA and UBS appealed to the Federal Supreme Court, and as of November 2026 the bonds remain written down while that appeal is pending. The case showed that the contractual terms of a bank's subordinated instruments can matter as much as the general ranking.

Investors demand a wider credit spread on subordinated debt to compensate for lower expected recoveries. Credit rating agencies usually rate an issuer's subordinated bonds one or more notches below its senior unsecured rating, and bank AT1 instruments further below. Many subordinated corporate bonds therefore fall into the high-yield category even when the issuer's senior debt is investment grade.

In credit-risk models, the difference shows up mainly in loss given default: the chance that the borrower fails is the same for senior and junior creditors, but junior creditors expect to recover much less if it does. Under the Basel foundation internal ratings-based approach, for example, subordinated claims carry a higher supervisory loss-given-default value than senior unsecured claims.

For borrowers, subordinated debt raises funds without diluting shareholders and without crowding out senior lenders, who often welcome it because it absorbs losses ahead of them. For investors, it offers higher income, but the risks are significant:

• Low recoveries. In a default, subordinated creditors may receive little or nothing.
• Payment blocks. Intercreditor terms can suspend interest payments while senior lenders are unpaid.
• Weak control. Standstill periods often prevent junior creditors from enforcing for months, leaving decisions to senior lenders in any debt restructuring.
• Write-down risk. Bank and insurer instruments can be written off by regulators before insolvency proceedings begin.

• Basel Framework (Bank for International Settlements)
• Financial Stability Board (FSB)