How to beat inflation with money you already have

The math nobody shows you

Real return is your nominal yield minus inflation. If your savings account pays 0.4 percent and prices rise 3 percent, your real return is negative 2.6 percent. On $20,000 that is about $520 of purchasing power gone in a year, with no transaction to notice.

Taxes come first, then inflation. A 5 percent yield in the 22 percent bracket is 3.9 percent after tax, which is barely ahead of a 3 percent inflation rate.

Why a short bonus beats a good rate

A bonus is a fixed payment for a fixed hold, so the shorter the hold, the higher the annualized return. $300 for holding $10,000 for 90 days is 3 percent in a quarter, which annualizes to about 12 percent. No savings account in the country pays that.

That is the entire idea behind ranking offers by effective APY instead of by headline dollars. It puts a $200 offer needing $1,000 above a $600 offer needing $50,000, which is the correct ordering when you have limited cash.

A cash ladder that stays ahead

• •Keep one month of expenses in your everyday checking, untouched.
• •Keep the rest of your emergency fund in a high yield savings account so the floor rate is decent.
• •Take whatever is above that and rotate it through one bonus at a time, always in FDIC or NCUA insured accounts.
• •Never chase a bonus with money you might need inside the hold period. The clawback is worse than the gain.

What this adds up to

Someone rotating $10,000 through four short bonuses a year at $250 each earns $1,000 on $10,000, which is a 10 percent return on cash that was otherwise losing to inflation. The money never leaves an insured account, and there is no market risk.