TIPS are U.S. Treasury notes and bonds whose principal adjusts with inflation (CPI-U). When CPI rises, principal steps up and the fixed coupon rate applies to the larger principal; when CPI falls, principal can step down (with rules that protect par at maturity for the inflation-adjusted amount in standard TIPS design—confirm current Treasury terms). Interest is taxable at the federal level as it accrues—including inflation adjustments—which surprises many first-time holders.
TIPS sit next to Series I bonds, Treasury bills, and bond funds vs ladders in a cash-and-bonds toolkit. Beginner frame: Investing basics for beginners.
TIPS vs I bonds vs T-bills vs a bond fund
| Feature | TIPS (individual) | I bonds | T-bills | TIPS mutual fund / ETF |
|---|---|---|---|---|
| Inflation link | Principal adjusts with CPI | Fixed + inflation composite rate | No CPI link (nominal discount yield) | Fund holds TIPS; share price moves with rates |
| Where beginners buy | TreasuryDirect, brokerages (Fidelity, Vanguard, Schwab) | TreasuryDirect | TreasuryDirect / brokers / auctions | Brokerage ticker (e.g., many “TIP” style funds) |
| Liquidity before maturity | Market price can move (duration risk) | 1-year lockup; penalty if under 5 years | At maturity (or secondary) | Daily trades; not a fixed maturity guarantee |
| Tax wrinkle | Phantom income on inflation adjustments in taxable accounts | Federal tax deferred until redemption; usually state-exempt | Discount taxed as interest (timing rules apply) | Fund distributions + NAV moves |
| Best mental model | Inflation-aware bond you may hold to maturity or in a ladder | Small annual cap; emergency-adjacent surplus | Dated cash needs | Instant diversification; rate volatility remains |
Duration still matters for TIPS prices when real yields change—see Bond duration basics. Laddering Treasuries: Bond laddering with Treasuries.
Worked example: $10,000 and a CPI surprise
Sam parks $10,000 in a newly issued 5-year TIPS at par with a 1.5% fixed coupon (illustrative). Over the next year CPI-U runs hot enough that the inflation-adjusted principal rises to about $10,300. Coupon payments are 1.5% of the adjusted principal, so interest cash ticks up slightly versus year one.
In a taxable brokerage account at Schwab or Fidelity, Sam may owe federal tax on the $300 inflation adjustment even without selling (the “phantom income” issue). That is why some households prefer TIPS inside a tax-advantaged account, or use I bonds’ different tax timing for a smaller slice—compare I bonds basics.
If real yields jump, the market price of Sam’s TIPS can fall before maturity even though the CPI link is working. Holding to maturity (or using a ladder) reduces the need to sell into that move. A TIPS fund would show the price swing in NAV immediately.
When TIPS fit (and when they do not)
Consider learning more about TIPS when:
- You already have emergency cash in a HYSA
- You want a Treasury-backed slice tied to CPI for medium-term goals
- You understand taxable phantom income or can hold inside an IRA/401(k)
Usually skip or keep tiny when:
- You need dollar certainty next month (use T-bills or HYSA)
- You would sell on every NAV dip in a TIPS fund
- You are still carrying high-APR credit card debt
Mortgage shopping and refinance strategy belong on dedicated mortgage resources—not in a TIPS primer.
Checklist
- Decide taxable vs tax-advantaged account before you buy TIPS.
- Compare an individual TIPS ladder vs a low-cost TIPS index fund’s duration.
- Read how CPI adjustments and coupons will appear on the 1099.
- Keep true emergency cash outside long-duration TIPS funds.
- Cross-check I bonds’ annual purchase cap if you want a simpler inflation-linked product.
- Revisit allocation only on a schedule—not after every CPI print.
Educational only. Not investment, tax, or financial-planning advice. Treasury rules and fund characteristics change; verify on TreasuryDirect and fund prospectuses.