how inflation affects your savings

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How inflation is measured

A dollar in a checking account isn’t a stable dollar. Inflation quietly reprices it downward every year — at 3% annual inflation, $100 today buys what $74 bought ten years from now. This guide explains how inflation math actually works, why a high-yield savings account isn’t always “making money”, and how to run the numbers on your own cash before deciding where to park it.

The purchasing-power formula

The long-run US average since 1913 is about 3.1% per year. The Federal Reserve targets 2% inflation, considers anything under 2% worryingly low (deflation risk), and anything over 4% worryingly high.

Real return vs nominal return

A high-yield savings account paying 4.5% with 3% inflation produces a real return of (1.045 / 1.03) − 1 = 1.46%. Real. That’s what’s actually compounding. Any time you see a “savings rate,” do this subtraction before getting excited.

What this means for emergency funds

Emergency funds should stay liquid — HYSA, money market, T-bills — even though real return on liquid cash is often 0–1% or negative. The whole point is immediate availability. Losing 2% of purchasing power on 3–6 months of expenses is the price of insurance against having to sell investments at a loss during a crisis.

Inflation and long-term goals

Liquid cash above 6 months of expenses is where inflation damage gets expensive. $50,000 parked in a checking account at 0.01% vs a HYSA at 4.5% is a $2,250/year opportunity cost — $22,500 over ten years of pure friction. Move it.

When inflation is actively helping you

Retirement planning has to be inflation-adjusted or the numbers lie to you. $1 million in 30 years isn’t $1 million of today’s money — at 3% inflation, it’s $412,000 in today’s terms. A retirement target of “$1M nominal” in 2055 is actually a modest goal, not the mountain it sounds like.

A two-minute inflation audit

Fixed-rate debt. Your 3.5% mortgage from 2021, in a 4% inflation world, has a real interest rate of negative-0.5%. The bank is paying you (in purchasing power terms) to hold their money. This is why people with low-rate mortgages shouldn’t rush to pay them off during inflation spikes — the arithmetic favors holding.