Seigniorage

Seigniorage originates from the medieval French seigneur (lord), who held the exclusive right to mint coins and charged a fee for doing so. In the modern economy, seigniorage is the profit a government earns from its monopoly on currency issuance. The simplest form: a government prints a £20 banknote at a cost of a few pence and uses it to purchase £20 of goods or services. The £19.95+ difference is seigniorage.

In modern central banking, seigniorage takes the form of the central bank's ability to create reserves and banknotes at near-zero cost. These are liabilities of the central bank but are non-interest-bearing (banknotes) or bear only the policy rate (reserves). The assets the central bank acquires — typically government bonds — earn interest. This interest profit flows back to the government as a dividend. In the US, the Federal Reserve remits its profits to the Treasury; in the UK, the Bank of England does the same.

When governments run large fiscal deficits and cannot finance them through borrowing, they may resort to financing spending through money creation — a process sometimes called "printing money" or monetary financing. This effectively taxes holders of existing money: as the money supply expands faster than real output, each unit of currency buys fewer goods — the purchasing power of existing savings falls.

This "inflation tax" is regressive: it falls hardest on those holding the most cash relative to their wealth — typically lower-income households. Historically, countries with weak tax collection capacity or deep fiscal crises have relied on seigniorage to finance government spending, often triggering high or hyperinflation. The Weimar Republic (Germany, 1923), Zimbabwe (2007–08), and Venezuela (2015–ongoing) are the most studied cases. The IMF working paper on seigniorage quantifies its role in modern emerging market inflation.

In countries with independent central banks and credible inflation targets, seigniorage is a modest and stable source of revenue — typically 0.2–0.5% of GDP — not a policy instrument. Central bank independence prevents governments from instructing the central bank to create money to finance deficits. The ECB Statute explicitly prohibits monetary financing of government deficits (Article 21). The inflation expectations of households and markets serve as a real-time check on any drift toward monetary financing: if markets suspected seigniorage abuse, long-term bond yields would spike and currency would weaken.