Decreasing the discount rate makes it cheaper for banks to borrow money from the Federal Reserve, which sets off a chain reaction through the broader economy. Banks pass their lower borrowing costs on to consumers and businesses in the form of cheaper loans, more money circulates through the financial system, and spending tends to increase. It’s one of the Federal Reserve’s primary tools for stimulating economic activity during slowdowns.
How the Discount Rate Works
The discount rate is the interest rate the Federal Reserve charges commercial banks when they borrow funds through what’s called the “discount window.” Banks sometimes need short-term cash to meet their reserve requirements or manage day-to-day operations, and the Fed serves as a lender of last resort. To access this funding, banks must pledge collateral and meet certain financial health standards.
There are two tiers. Banks in generally sound financial condition qualify for “primary credit” at the standard discount rate. Banks that don’t meet that threshold can still borrow through “secondary credit,” but they pay a higher rate. Since March 2020, the primary credit rate has been set at the top of the Federal Reserve’s target range for the federal funds rate, the benchmark rate that influences borrowing costs across the entire economy.
The Effect on Money Supply
When the Fed lowers the discount rate, borrowing from the central bank becomes more profitable for commercial banks. Banks that might have hesitated to take on short-term Fed loans now find the cost worthwhile. As more banks borrow, the total reserves in the banking system increase. Those additional reserves allow banks to issue more loans to businesses and individuals, which expands the overall money supply.
The reverse is equally straightforward. When the discount rate rises, banks borrow less from the Fed, total reserves shrink, and the quantity of money flowing through the banking system contracts. The relationship between the discount rate and money supply moves in opposite directions: a lower rate means more money in circulation, a higher rate means less.
What It Means for Borrowers
The most tangible effect for everyday people is that interest rates on loans tend to fall. When banks can borrow cheaply from the Fed, they have less need to charge high rates to their own customers. This typically shows up in lower rates on mortgages, auto loans, credit cards, and business lines of credit. The savings aren’t always immediate or perfectly proportional, but the direction is consistent: cheaper money for banks eventually translates into cheaper money for you.
For someone shopping for a mortgage, even a small rate decrease can make a meaningful difference over 30 years. A quarter-point drop on a $300,000 mortgage saves tens of thousands of dollars in total interest. Businesses benefit too, since lower borrowing costs make it easier to finance new equipment, hire employees, or expand operations. This is exactly the kind of spending the Fed hopes to encourage when it cuts the discount rate.
Impact on Investments and Valuations
The discount rate concept also plays a central role in how investors value assets, though in a slightly different sense. In finance, a “discount rate” is used to calculate what future earnings are worth in today’s dollars. When that rate drops, future cash flows become more valuable in present terms. A rental property expected to generate $50,000 a year for the next decade looks like a better deal when the discount rate is low, because those future dollars are worth more relative to what you’d pay today.
This principle applies broadly. Lower discount rates increase the net present value of business projects, making investments that seemed marginal suddenly look attractive. Companies are more likely to green-light expansion plans, developers are more willing to break ground on new projects, and investors place higher valuations on stocks. Higher discount rates have the opposite effect, shrinking valuations and making investors more cautious.
Stock Market Response
Stock prices generally rise when discount rates fall, for two interconnected reasons. First, lower rates make bonds and savings accounts less attractive, pushing investors toward equities in search of better returns. Second, the valuation math changes: when you discount a company’s expected future earnings at a lower rate, the stock looks more valuable today.
The relationship isn’t always clean, though. During the early COVID-19 market crash, overall implied discount rates actually declined (dropping from a mean of 18.4% to 16.8%), yet stocks still fell sharply. The reason: investors slashed their expectations for future corporate growth, and that pessimism about earnings overwhelmed the positive effect of lower discount rates. Research from that period found that changes in expected growth outweighed discount rate effects by a factor of roughly 1.2. In other words, a lower discount rate helps stock prices, but it can’t single-handedly prop up markets if investors believe the economy is headed for serious trouble.
Why It Sometimes Doesn’t Work
Cutting the discount rate is a powerful tool, but it has limits. The most significant is what economists call a liquidity trap. This happens when interest rates are already at or near zero, leaving the Fed with no room to cut further. In that situation, banks already have access to extremely cheap money, but they may not want to lend (because they’re worried about defaults), and businesses may not want to borrow (because they’re worried about demand). The cheap money just sits idle.
During a liquidity trap, the core problem is that the real interest rate, adjusted for inflation, is effectively too high even at zero. If prices are falling (deflation), the real cost of borrowing actually rises despite rock-bottom nominal rates. Research from MIT describes this scenario as one where “the main distortion is that the real interest rate is set too high during the liquidity trap,” which depresses consumer spending regardless of how low the Fed sets its rates. The severity of the downturn depends on how long the trap lasts, and outcomes can deteriorate significantly the longer it persists.
This is why the Fed sometimes turns to unconventional tools like quantitative easing (buying large amounts of bonds directly) when rate cuts alone aren’t enough. Lowering the discount rate works best when the economy has room to respond, when banks are willing to lend, consumers are willing to spend, and the problem is simply that borrowing costs are too high rather than a deeper crisis of confidence.