A negative interest rate is a monetary policy in which a central bank charges commercial banks a fee, rather than paying them interest, on the reserves those banks hold at the central bank. It flips the normal arrangement between saver and institution: money parked in the safest possible place actually shrinks over time. Central banks in Europe and Japan used the tool between 2014 and 2024 to fight deflation and sluggish lending. By 2026 every major central bank had returned to positive territory, but the policy’s effects on mortgage rates, bond yields, and asset prices are worth understanding because they touched nearly every borrower and saver while it was in force.
How the Mechanism Works
Under ordinary monetary policy, commercial banks earn interest when they leave excess reserves overnight at the central bank. A negative rate reverses that: the central bank charges a fee on those deposits. A rate of -0.5% means a bank holding excess reserves loses 0.5% of those funds over a year.1Federal Reserve Bank of St. Louis. A Primer on Negative Interest Rates That charge attaches to the central bank’s deposit facility rate, which then pulls other borrowing costs down with it: interbank lending, bond yields, and eventually the rates offered on business loans and mortgages.
This is not the same thing as a checking account maintenance fee. A negative policy rate targets the plumbing of the banking system, specifically the reserves commercial banks keep at the central bank. The point is to make idle cash expensive so banks lend it out instead.
Tiered Deposits Protect Bank Profits
Charging a fee on every dollar of reserves would gut bank profitability, so central banks usually exempt part of the reserve base. The European Central Bank introduced a two-tier system in September 2019 that let reserves up to six times a bank’s minimum requirement earn 0%, with only the excess subject to the negative deposit facility rate.2Banco de España. What Is the Two-Tier System? The Bank of Japan applied a similar three-tier structure, with the negative rate biting only a narrow slice of reserves. Tiering preserves the incentive to lend while limiting damage to bank margins.
Why Central Banks Reach for This Tool
Negative rates are a last resort, deployed after the overnight rate has already been cut to zero and asset purchases have not delivered enough activity. Three motivations show up repeatedly.
Fighting Deflation
Deflation is a sustained drop in the general price level, and it sounds harmless until you consider its behavioral effect. If goods will cost less next month, consumers and businesses postpone spending, deepening the slump. Penalizing idle reserves is meant to force money into circulation and nudge inflation back toward the central bank’s target, usually around 2%.
Stimulating Bank Lending
A bank facing a charge for parking cash at the central bank has a strong reason to lend that cash instead. Even a small positive return on a loan beats paying a penalty. The intended result is more credit to businesses and households, funding investment, purchases, and hiring.1Federal Reserve Bank of St. Louis. A Primer on Negative Interest Rates
Weakening the Currency
For smaller, export-dependent economies, negative rates also discourage foreign capital from flowing in and driving up the local currency. Switzerland, Denmark, and Sweden all adopted them in part to stem safe-haven money that was making their exports more expensive abroad. The Office of the Comptroller of the Currency found that the policy in those three countries did help prevent further rapid appreciation of their currencies.3Office of the Comptroller of the Currency. Do Negative Interest Rate Policies Actually Work?
What It Means for Depositors
Negative rates squeeze the gap between what banks earn on loans and what they pay on deposits. Banks respond with some mix of more lending, higher service fees, and adjusted product terms. The central bank hopes lending dominates the response; in practice, fees on checking accounts, wire transfers, and safe deposit boxes also tend to rise.
Passing a negative yield through to ordinary retail savers is rare. Banks fear triggering withdrawals, and the cost of physically storing cash acts as a natural floor: as long as a bank account is cheaper than a vault, customers accept rates near zero. Most individual savers during the negative-rate years saw deposit rates fall to 0.00% or 0.01% rather than below.
Large institutional depositors have less room to escape. Corporate treasuries and pension funds holding millions in cash cannot easily convert to physical currency, and they were more likely to face a direct negative rate on their balances, effectively a fee for keeping large sums liquid.
What It Does to Bonds and Borrowing Costs
When the policy rate goes below zero, the effect flows into government bond yields. Sovereign bond yields across the eurozone and Japan turned negative at multiple maturities during the peak years, meaning buyers who held to maturity were guaranteed to receive less than they paid. Global negative-yielding debt reached roughly $18.4 trillion in late 2020 and then evaporated once central banks began raising rates.
Investors accept guaranteed losses on those bonds for practical reasons. Insurance companies and pension funds are often required to hold high-grade sovereign debt regardless of yield. Others use negative-yield bonds as a safer alternative to cash when deposit rates are even more punitive. The negative yield functions as a storage fee for the safest available asset.
Lower policy rates also drag down borrowing costs more broadly. Mortgage rates and corporate loan rates fall, which is precisely the mechanism the policy relies on. Cheaper credit encourages business expansion and gives homeowners room to refinance.
The Reach for Yield
When safe assets pay negative returns, investors move toward riskier ones: high-yield corporate bonds, equities, and real estate. This reach for yield can inflate asset prices beyond what fundamentals support. Property markets are particularly exposed because lower borrowing costs directly raise the amount a buyer can finance, pushing prices up and drawing in more speculative capital.
The Point Where Cutting Further Backfires
There is a theoretical threshold below which further cuts contract lending rather than expanding it. Economists call it the reversal rate. Push rates low enough and bank profitability erodes to the point where institutions pull back from lending to preserve capital. Research from the Federal Reserve Bank of Philadelphia estimated the reversal rate at roughly -0.8% for aggregate investment and -1.2% for bank lending in a calibrated model.4Federal Reserve Bank of Philadelphia. The Reversal Interest Rate Those figures are not far below the rates several central banks actually reached, which suggests the policy was operating near its effective limits.
Where the Policy Has Been Used
Negative interest rate policies were concentrated in Europe and Japan after the 2008 financial crisis. Every central bank that adopted them has returned to positive territory.
- European Central Bank. The ECB cut its deposit facility rate below zero in June 2014, initially to -0.10%, eventually reaching -0.50%. It exited in July 2022, raising the deposit facility rate back to 0.00%.5European Central Bank. ECB Introduces a Negative Deposit Facility Interest Rate6European Central Bank. Monetary Policy Decisions
- Bank of Japan. The BOJ adopted -0.10% on a portion of commercial bank reserves in January 2016. Japan was the last major economy to exit, ending the policy in March 2024.7Bank of Japan. Minutes of the Monetary Policy Meeting on January 29, 2016
- Swiss National Bank. The SNB reached -0.75%, one of the deepest negative rates among major central banks, primarily to curb appreciation of the franc. It exited in mid-2022.8Swiss National Bank. Current Interest and Exchange Rates
- Denmark. Danmarks Nationalbank held a negative deposit rate for extended periods, primarily to defend the krone’s peg to the euro. Its run was among the longest, spanning several years with brief interruptions.
- Sweden. The Riksbank cut its main repo rate to -0.10% in February 2015, reached -0.35% by year-end, and cut further in 2016 before normalizing.9Sveriges Riksbank. Annual Report 2015
The post-2022 return of inflation across most developed economies made the tool unnecessary. Whether central banks would revisit it in a future deflationary slump is an open question.
Why the United States Never Went Negative
The Federal Reserve considered negative rates in the low-growth years after 2008 but did not adopt them. One obstacle is legal. Federal law authorizes the Fed to pay interest on bank reserves, but whether that authority extends to charging negative interest, effectively a penalty, is unresolved. Former Fed Chair Ben Bernanke noted the statute permits paying interest on reserves but does not clearly authorize paying a negative amount. Recasting the charge as a fee runs into a separate legal constraint requiring that Fed service fees reflect actual costs over the long run.10Brookings Institution. What Tools Does the Fed Have Left? Part 1: Negative Interest Rates
The U.S. Treasury has also set a practical floor. Since 2011, Treasury rules provide that if a note or bond auction produces a yield below 0.125%, the coupon is set at one-eighth of one percent and the price is adjusted to a premium rather than issued at a truly negative nominal yield.11TreasuryDirect. Information on Negative Rates and TIPS The U.S. government bond market is structurally set up to avoid negative nominal yields on new issuance, unlike the eurozone. Stronger U.S. growth and inflation compared with Europe and Japan also reduced the practical need. The Fed relied on quantitative easing instead when rates hit zero.
Negative Nominal Rates Versus Negative Real Rates
The rates discussed above are negative nominal rates: the stated number is literally below zero. That is the unusual policy tool. A separate situation affects savers routinely: negative real rates. A real interest rate is the nominal rate minus inflation. If your savings account pays 2% and inflation is 4%, your real return is -2%. Your balance grows in dollar terms but buys less. Negative real rates have been a routine feature of the U.S. economy during high-inflation periods, including much of the 2020s. No exotic central bank policy is needed for savings to lose purchasing power; ordinary inflation does it quietly. The two have different causes and different implications, and confusing them is common.