The city's loan portfolio consists of investment and liquidity loans and is actively managed to limit interest rate and liquidity risks. In addition to traditional bank loans, the state capital of Mainz issues bonds and promissory notes to raise liquidity.

To illustrate its debt situation, the state capital has been publishing the "Debt Report of the State Capital of Mainz" for several years. The report provides information, mainly in graphical form, on the debt portfolio of the state capital of Mainz and the resulting financial obligations, and shows how certain key figures have changed over the long term.