What Is the Real Interest Rate? Why Higher Deposit Rates Can Still Reduce Purchasing Power
경제 개념 The real interest rate measures how much the purchasing power of money rises or falls after inflation. A deposit rate can increase from 3% to 4%, yet leave a saver worse off in real terms if inflation accelerates from 2% to 5%. The account balance grows, but it may buy less. To judge a deposit properly, compare its actual after-tax return with inflation over the same period. Information reviewed September 15, 2026 · Briefing on Money 한국어 · English The short answer A nominal rate is the stated interest rate; a real rate adjusts that return for inflation. Subtracting inflation from the nominal rate gives a useful approximation, while the exact formula accounts for compounding. A deposit rate can rise while the real return falls if inflation rises faster. Savers should compare after-tax yield, eligibility for bonus rates, early-withdrawal terms and exp...