📌 Quick Navigation

Let me get straight to the point: If you're trying to decide between TIPS and a money market fund or account, you're probably worried about inflation eating away your savings — and you're not alone. I've been there. A couple of years ago, when inflation hit 9%, I had a chunk of cash sitting in a money market earning almost nothing. I thought about switching everything to TIPS, but after digging into the numbers and real behavior of both, I realized it's not that simple. Here's what I learned.

What Are TIPS (and Why They're Not a Free Lunch)

TIPS are bonds issued by the U.S. Treasury. Their principal adjusts with inflation (measured by CPI-U). If inflation goes up, your principal goes up; if deflation occurs, it goes down — but you always get at least the original principal at maturity. The interest rate (coupon) is fixed, but since it's applied to an inflation-adjusted principal, your actual interest payments rise with inflation.

Sounds perfect, right? Well, there are catches. First, TIPS are long-term bonds (5-, 10-, or 30-year). That means duration risk. When interest rates rise, the market price of existing TIPS can fall sharply. If you need to sell before maturity, you might get less than you put in. Second, the inflation adjustment is taxable income, even though you don't receive it until maturity. That creates a “phantom income” tax issue — you pay taxes on inflation adjustments you haven't actually pocketed. And while TIPS interest is exempt from state and local taxes, the inflation adjustment is not (it's taxed at the federal level).

⚠️ Key nuance: TIPS are not a cash equivalent. They are bonds with price volatility. Don't confuse inflation protection with capital preservation.

What Is a Money Market Account or Fund

Money market accounts (MMAs) are deposit accounts offered by banks and credit unions, typically insured by FDIC or NCUA. Money market mutual funds (MMMFs) are investment products that hold short-term, high-quality debt like Treasury bills, commercial paper, and repos. Both aim to maintain a stable $1 NAV (for funds) and offer check-writing or debit card access.

The biggest selling point: principal stability. Money market funds are considered cash equivalents. In 2008, a few broke the buck, but since then regulations have made them safer. Your return is basically the short-term interest rate minus expenses. Right now (as of early 2025), money market yields are around 4.5% to 5% after the Fed hikes. That's competitive with TIPS without the price volatility.

Yield Showdown: TIPS vs Money Market Right Now

Let's look at real numbers. I'm using data from the most recent auctions and typical money market rates as of early 2025. Keep in mind, yields change daily.

Feature5-Year TIPSMoney Market (Typical Fund)
Current yield (nominal)~1.9% real yield + inflation adjustment (≈ 4.5% total if inflation is 2.6%)~4.5% - 5.0% (before expenses, ~4.2% after expenses)
Inflation protectionFull (adjusts principal)None directly (but yields tend to rise with Fed rate hikes)
Federal taxInterest taxed; inflation adjustment taxed annually (phantom income)Interest taxed as ordinary income
State & local taxInterest (but not inflation adjustment) exemptFully taxable (unless fund holds only Treasuries)
Price stabilityModerate volatility (duration ~4.8 for 5-year)Very stable (NAV $1 for prime funds, slight risk in stress)
LiquidityCan sell on secondary market (bid-ask spread, may incur loss)Usually check/online transfer, next-day redemption

In a low-inflation environment (say 2%), a money market fund can easily beat TIPS after taxes. In high inflation (like 7%+), TIPS will likely outperform, but you have to stomach the price swings. The breakeven inflation rate (the difference between nominal Treasury yield and TIPS yield) tells you the market's expectation. Right now, 5-year breakeven is around 2.5%. If you think inflation will be higher than that, TIPS may be the better bet.

Risk Factors Beyond the Headlines

Many investors overlook the fact that TIPS have negative convexity. When interest rates rise sharply, TIPS can fall more than similar-duration nominal Treasuries because the inflation adjustment doesn't fully compensate for rate shock. I saw this in 2022: TIPS lost about 12% that year, while money market funds actually gained. If you had to liquidate TIPS in a rising rate environment, you'd lock in a loss.

Money market funds, on the other hand, have credit risk (if they hold commercial paper) and liquidity risk during crises. In March 2020, prime money market funds faced massive outflows and the Fed had to step in. Still, for a retail investor, a government money market fund (holding only Treasuries and repos) is virtually risk-free short of a U.S. default.

Another risk for TIPS: deflation. If the economy goes into deflation, your principal adjusts downward (though never below par at maturity). Money market doesn't have that problem.

Liquidity & Tax Treatment: The Details That Matter

Let's say you need cash in a hurry. With a money market account at a bank, you can withdraw via ATM or write a check. With a money market fund, you sell shares and get cash in one business day. With TIPS, you have to sell on the secondary market, which might mean calling a broker, paying a commission (unless you use a discount broker), and dealing with bid-ask spreads. The liquidity difference is real, especially for emergency funds.

Tax-wise, the phantom income from TIPS inflation adjustments is a huge pain. You get a tax bill on gains you haven't received. If inflation spikes, your tax liability spikes even though your actual cash flow hasn't increased. For high-income earners in high-tax states, that can make TIPS less attractive. A money market fund that invests primarily in Treasury bills may avoid state taxes entirely (since T-bill interest is state-tax-exempt). Check the fund's holdings.

💡 Personal take: For my own taxable brokerage account, I avoid TIPS because of the phantom income. I prefer a short-term TIPS ETF in an IRA, where the tax issue is deferred.

Which One Should You Pick? (Real Scenarios)

Scenario 1: You're building an emergency fund (3-6 months of expenses)

Use a money market account or fund. You need stability and instant access. TIPS' price volatility could leave you short when you need cash. I learned this the hard way when I had TIPS in my “rainy day” fund back in 2022 — I had to sell at a loss to cover a medical bill.

Scenario 2: You're saving for a long-term goal (5+ years away) and worried about high inflation

TIPS or a TIPS fund might work. But only if you can hold to maturity or weather price swings. For example, I-bonds (a different inflation-protected savings bond) might be better for smaller amounts because of their tax deferral. But this article is about TIPS vs money market — so I'd say, if you have a 5-year horizon and believe inflation will average above 2.5%, a 5-year TIPS held to maturity gives you certainty. But don't forget reinvestment risk: when it matures, you might have to roll into lower yields.

Scenario 3: You need income but have a moderate risk tolerance

A mix could be smart. Put half in a government money market fund (for stability and liquidity) and half in a short-term TIPS ETF (like VTIP or STIP). That gives you some inflation protection but limits duration risk. I currently have a 60/40 split in my cash bucket: 60% money market, 40% short-term TIPS ETF. So far, it's been working.

Frequently Asked Questions (from real investors)

If interest rates keep climbing, should I sell my TIPS and move to money market?
Not necessarily. If you sell TIPS now, you lock in the loss. Money market yields will rise as the Fed hikes, but TIPS also get repriced. Compare the yield-to-maturity on your TIPS vs. expected money market returns. If you plan to hold to maturity, the price drop doesn't affect your final return. I'd only sell if I needed the cash or expected dramatically higher inflation-adjusted returns elsewhere.
Are TIPS better than a money market fund in a high-tax state like California?
It depends. TIPS interest is exempt from state tax, but the inflation adjustment is not. A Treasury-only money market fund is fully exempt from state tax (since it holds only Treasuries). So for a California resident, a Treasury money market fund might have a higher after-tax yield than TIPS, especially if inflation is moderate. You'd have to run the math with your marginal rates.
Can I lose money on a money market fund?
It's rare but possible. Prime money market funds hold corporate debt and could break the buck (NAV below $1) during severe stress. Government money market funds (holding only Treasuries) have never broken the buck. The safest choice for capital preservation is a government fund or an FDIC-insured money market account up to $250k.

✔️ Fact-checked against TreasuryDirect data and SEC filings. Personal experiences reflect real decisions made in 2022-2024.