Money Market ETFs: Using the Cash Alternative in Your Portfolio Properly
With ECB rates clearly above zero again, money market ETFs have become the most serious rival to savings accounts — no rate-hopping between promotional offers, held right inside your brokerage account. They deliver the €STR (Euro Short-Term Rate) almost one-to-one, tradable daily and with no fixed term. For experienced investors the question isn’t whether, but how: structure, after-tax return and the right role in the portfolio.
How €STR ETFs work: a swap instead of a bond basket
The common products (such as Xtrackers Overnight Rate Swap or Amundi/formerly Lyxor Smart Overnight Return) replicate the €STR synthetically: the fund holds a substitute portfolio and swaps its return for the interbank overnight rate. The result is a near-linear performance of €STR minus TER (around 0.10%), with virtually no price swings and no interest-rate risk, since duration is close to zero.
- Yield: tracks the ECB deposit rate directly — it rises and falls with every rate decision.
- Risk: swap counterparty risk is tightly limited by UCITS rules (collateral, max 10% exposure), but not zero.
- No deposit insurance: segregated fund assets instead of the €100,000 guarantee — a different, not necessarily worse, safety model.
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Money market ETF vs. savings account: the after-tax view
One tax detail is often missed: money market ETFs get no Teilfreistellung (partial exemption), as they are not equity funds. Income is taxed in full at 26.375% in Germany — just like savings interest. The advantage lies elsewhere: with an accumulating ETF, only the annual Vorabpauschale applies — most of the actual tax is deferred until you sell. On a €50,000 cash reserve at roughly 2% that’s about €1,000 of income per year — the deferral effect is real, but not a game changer.
| Criterion | Money market ETF | Savings account |
|---|---|---|
| Yield | €STR minus TER, automatically market-level | Bank rate, often promotional only |
| Partial tax exemption | None (0%) | None |
| Tax timing | Vorabpauschale, rest on sale | Fully taxed each year |
| Protection | Segregated assets, collateralised swap | Deposit insurance up to €100,000 |
| Access | Every trading day, mind order fees | Daily, free |
The right role in your portfolio
Money market ETFs aren’t a return engine, they’re infrastructure: an interest-bearing cash buffer, a rebalancing reserve that’s instantly deployable without moving money between accounts, and a parking spot after sales. If your liquidity sits in the brokerage account rather than at the bank, portfolio analysis shows it where it belongs — inside your asset allocation. Rule of thumb: emergency fund in the savings account (deposit insurance), tactical liquidity in the money market ETF.
Frequently asked questions
Can a money market ETF lose value?
Marginally intraday, yes. With a negative €STR (as before 2022) the price erodes slowly by the negative rate plus TER. But there is practically no price risk like in bond ETFs with duration.
Do money market ETFs get the German partial tax exemption?
No. They don’t qualify as equity funds, so income is taxed in full at 26.375% — exactly like savings interest.
Is the ETF worth it versus rate-hopping between banks?
For mid-sized amounts usually yes: the €STR permanently sits near the ECB deposit rate, while top savings rates are almost always time-limited promotions. In exchange you pay order fees and spread.
Concentration risks, ETF overlap and look-through analysis – free with MoneyPeak.