Negative Interest Rate Policy

A negative interest rate policy (NIRP) sets the rate the central bank pays on bank deposits below zero, effectively charging banks a fee for holding reserves. The goal is to penalise excess cash hoarding, forcing banks and investors to lend or spend money rather than park it safely at the central bank, thereby stimulating economic growth and fighting deflation.

The logic: make cash costly

Conventional monetary policy lowers interest rates to stimulate borrowing and spending. If the rate hits zero, the story goes, conventional tools are exhausted—there’s no room to go lower, and cash becomes perfectly safe relative to any risky investment. Banks and firms will just hoard cash rather than lend or invest.

Negative rates flip this: the central bank charges for the privilege of holding reserves, turning cash from a safe haven into a liability. A bank holding one million units overnight at -0.5% loses five units to fees. The incentive shifts sharply—lend it out, invest it, spend it, anything but hold it. In theory, this rekindles demand throughout the economy.

The policy emerged from desperation. After the 2008 financial crisis, the Federal Reserve, European Central Bank, and Bank of Japan deployed quantitative easing and held rates near zero for years. Yet growth remained sluggish, unemployment stayed high, and deflation risks persisted. Something more aggressive seemed necessary.

How negative rates work in practice

A central bank announces that starting on a given date, the deposit rate (the rate paid on reserves held at the central bank) will be, say, -0.5%. Banks paying this rate will naturally try to pass the cost on to their depositors—charging retail customers negative rates on savings accounts. Most retail banks hesitate to do so, fearing customer rebellion and deposit flight. Instead, they often absorb the cost, squeezing their net interest margin (the spread between lending and deposit rates).

For corporate and institutional deposits, negative rates propagate faster. Large firms and institutional investors face near-zero or negative returns on money-market funds and bank deposits. This pushes them toward riskier assets—corporate bonds, equities, real estate—in search of positive returns. Borrowing becomes cheaper because lenders, facing negative returns on safe assets, become hungrier for yield.

Negative rates also pressure the exchange rate lower. Investors flee a low-yielding currency, seeking higher returns elsewhere, weakening the currency and boosting exports. This can conflict with other central banks’ goals if the depreciation is seen as competitive devaluation.

Who has used negative rates

Sweden’s Riksbank pioneered NIRP in 2009, followed by Denmark’s central bank. The ECB moved to negative rates in 2014 as the eurozone struggled with weak growth and deflation; rates bottomed at -0.5% in 2016. Japan joined in 2016, pushing the policy deposit rate to -0.1%. Switzerland and others also adopted negative rates at various times.

The policy gained a reputation as a last resort—deployed when conventional easing had failed and central banks feared a deflationary spiral. The use was also regional; the US never adopted negative rates, and when the Federal Reserve threatened the possibility in 2012, markets and politicians recoiled. In America, the cultural and political case against penalising savers was too strong.

Does it actually work?

The empirical record is mixed. Sweden’s negative rates coincided with a recovery but may not have caused it; other factors (fiscal stimulus, commodity-price rebound, global growth) mattered too. The ECB’s negative rates did weaken the euro and supported some reflation, but growth remained subdued for years. Japan’s negative-rate experiment was so small (-0.1%) and so hedged with caveats that its impact is hard to isolate.

The core problem: if people and businesses believe deflation is coming, no interest rate—negative or positive—will entice them to spend or invest. Confidence and expectations matter more than the rate itself. Negative rates can be a signal that the central bank is serious, but signal alone does not rebuild demand if the underlying economic malaise persists.

There is also a ceiling of negative rates. If they go too deep, banks may cut lending (to protect margins), hoard physical currency, or collapse entirely. Depositors, facing negative returns everywhere, might flee to cash—though hoarding large volumes of physical notes is expensive and risky. At some point, the costs of NIRP exceed the benefits.

Distributional pain: who bears the cost?

Negative rates hit savers hard. Pensioners relying on fixed-income investments see real returns eroded. Retail banks’ profitability suffers as they absorb the cost rather than charge consumers. Insurance companies, which promise fixed returns to policyholders, face squeezed margins.

Conversely, borrowers benefit—mortgages and business loans become cheaper, though banks may tighten standards to protect themselves. The young, entering the job market, benefit from easier hiring as firms’ borrowing costs fall. Equity investors can gain if lower rates inflate valuations, even if cash returns are negative.

Negative rates are thus a form of redistribution from savers to borrowers and debtors—politically contentious, especially in societies where savers are numerous or powerful.

Costs and side effects

Beyond distributional concerns, negative rates carry several costs:

Financial-stability risk: If banks’ profitability erodes enough, they may take excessive risk (increasing leverage, chasing yield) to stay viable. Alternatively, they may shrink lending precisely when stimulus is most needed.

Asset-bubble risk: Desperate investors, facing negative returns on safe assets, pour money into equities, real estate, and other speculative assets, inflating bubbles.

Currency wars: A country deploying deep negative rates weakens its currency, which can trigger retaliation from trading partners and lead to competitive devaluations.

Inflation surprise: If negative rates unexpectedly succeed in igniting demand and inflation accelerates, the central bank may face an awkward reversal, with savers and pensioners suffering a double blow.

The post-2023 perspective

By 2022–2023, most central banks with negative rates began raising them back toward zero and above as inflation resurged. The ECB ended its NIRP in 2022, Sweden exited in 2023. The consensus shifted: negative rates were a temporary, uncomfortable tool for extraordinary times, not a standard part of the toolkit.

Central banks now emphasize that negative rates should be considered only as a last resort, paired with forward guidance and explicit thresholds for when they would be lifted. The experiment revealed both the limits of monetary policy and the importance of communication—if people believe negative rates are temporary and the central bank has a credible exit plan, side effects are contained. If the policy is seen as permanent, behaviour becomes more distorted.

See also