Real interest rate explained: definition and FX impact
By Ken Chigbo, Founder, KenMacro. Published 2026-05-13.
Quick answer
The real interest rate is the nominal interest rate adjusted for expected inflation. It reflects the true return a lender earns or a borrower pays in purchasing power terms. Traders proxy it using inflation-protected securities such as US TIPS, where the traded yield directly represents the market-implied real yield.
What is real interest rate?
A real interest rate is the nominal yield on a bond or deposit minus the expected rate of inflation over the same horizon. Economists call this the Fisher relationship: nominal yield equals real yield plus expected inflation plus a small risk premium. In practice, the cleanest market proxy comes from Treasury Inflation-Protected Securities (TIPS), where coupon payments and principal are indexed to CPI. The yield quoted on a 10-year TIPS is a direct read on the 10-year real interest rate. The gap between the nominal 10-year Treasury yield and the 10-year TIPS yield is the breakeven inflation rate.
How traders use real interest rate
The desk tracks real yields because they sit at the centre of cross-asset positioning. Rising US 10-year real yields typically pressure gold, since gold pays no coupon and competes with inflation-protected paper for portfolio space. Real yield differentials between the United States and the euro area, the United Kingdom, or Japan are a primary driver of medium-term currency direction, often more reliable than nominal differentials during regimes when inflation expectations diverge. Retail traders monitor the 10-year TIPS yield published daily by the US Treasury, alongside German real yields derived from inflation-linked Bunds. Institutional desks build curves of real yields at the 2-year, 5-year, 10-year, and 30-year points to identify whether moves reflect growth repricing, term premium shifts, or Fed policy expectations.
ASIC regulated. Strong mid-tier broker with competitive raw-spread accounts and full MT4 and MT5 support.
Worked example of a real interest rate calculation
Assume the 10-year US Treasury yields 4.20 per cent and the 10-year TIPS yields 1.80 per cent. The implied 10-year real interest rate is 1.80 per cent, and the breakeven inflation rate is 2.40 per cent, meaning the market expects average annual CPI of roughly 2.40 per cent over the next decade. If the Fed signals more hawkish policy and TIPS yields rise to 2.10 per cent while nominal yields rise only to 4.30 per cent, real rates have climbed 30 basis points while breakeven inflation has fallen to 2.20 per cent. That combination is typically dollar-positive and gold-negative.
Frequently asked
What is the difference between nominal and real interest rates?
The nominal interest rate is the headline yield quoted on a bond or deposit, before any adjustment for inflation. The real interest rate strips out expected inflation to show the actual purchasing power return. If a one-year deposit pays 5 per cent nominal and expected inflation is 3 per cent, the real rate is approximately 2 per cent. Real rates matter because consumption, investment, and currency decisions respond to purchasing power outcomes rather than to headline yields.
How do real interest rates affect the US dollar?
When US real yields rise relative to other major economies, capital tends to rotate into dollar-denominated assets, supporting the broad dollar index. The relationship is most visible in DXY against EUR and JPY, where multi-month moves often track the 10-year real yield differential closely. The desk watches the gap between US TIPS yields and German inflation-linked Bund yields as a core driver of EUR/USD trend, particularly during divergent central bank cycles.
Why do real interest rates matter for gold?
Gold pays no coupon and carries storage costs, so its appeal falls when investors can earn a positive real return in inflation-protected bonds. Historically, the price of gold has shown a strong inverse correlation with the 10-year US TIPS yield. When real yields turn deeply negative, gold tends to rally, and when real yields rise sharply into positive territory, gold typically faces sustained selling pressure from real-money allocators.
Can the real interest rate be negative?
Yes. A negative real interest rate occurs when expected inflation exceeds the nominal yield, meaning lenders lose purchasing power over the life of the loan. This was common across developed markets between 2020 and 2022, when central banks held policy rates near zero while CPI accelerated. Negative real rates encourage borrowing, discourage saving, and typically support risk assets, commodities, and gold while weighing on the currency of the country running the most negative real yield.
Related from the desk
Educational analysis only. Past performance does not guarantee future results. Manage risk against your own portfolio.
Continue reading