In finance, seniority refers to the order of repayment in the event of a sale or bankruptcy of the issuer. Seniority can refer to either debt or preferred stock. Senior debt must be repaid before subordinated (or junior) debt is repaid.^[1] Each security, either debt or equity, that a company issues has a specific seniority or ranking. Bonds that have the same seniority in a company's capital structure are described as being pari passu. Preferred stock is senior to common stock in a sale when preferred shareholders must receive back their preference, typically their original investment amount, before the common shareholders receive anything.

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The seniority of bonds recognised in FpML (Financial products Markup Language) are as follows:

• Security interest
• Secured creditor
• Senior debt
• Unsecured creditor
• Preferential creditor