Interest-Bearing Account or Money Market Fund?

If you keep €100,000 of emergency savings in an interest-bearing account (cuenta remunerada) paying 2%, you are already losing €1,380 in the very first year compared with a money market fund paying 3%. That is not a subtle difference: these are real euros that either stay in your pocket or go down the tax drain.

‍

The comparison that changes everything: real differences from day one

Imagine you have €100,000 for your emergency cushion. Let's see what happens with each option during the first year:

Interest-bearing account at 2%:

• You generate €2,000 gross
• The Spanish tax authority (Hacienda) takes €380 (19% tax)
• Your net gain: €1,620
• Final capital: €101,620

Money market fund at 3%:

• You generate €3,000, which is fully reinvested
• Hacienda takes nothing (tax deferral)
• Your reinvested gain: the full €3,000
• Final capital: €103,000

Difference in the first year: €1,380 in your favor. And that is just the beginning.

‍

Tax deferral: your ally from minute one

With an interest-bearing account, Hacienda takes its share every year. With a money market fund, all of your money keeps working for you until you decide to redeem it. This advantage compounds dramatically over time.

Evolution of an initial €100,000: significant differences from the very first year between an interest-bearing account and a money market fund

The chart shows how, starting with €100,000, the differences are evident from the first year and widen exponentially.

‍

The evolution over time: why every year counts

‍

Note: Differences shown before the final taxation of the money market fund

‍

The net comparison: what you actually keep

Even after deducting the final tax you would pay when redeeming the money market fund, the advantage is clear:

‍

The phantom money working for you

Tax deferral is not just about postponing taxes. It means money that would have gone to Hacienda keeps generating returns:

• Year 1: an extra €570 working for you thanks to the deferral
• Year 3: an extra €1,762 generating returns for you
• Year 5: an extra €3,026 you would not have in an interest-bearing account
• Year 10: an extra €6,534 growing year after year

This "phantom money" turns into real euros thanks to uninterrupted compound interest.

The funds that capture this advantage

- La Française Trésorerie: With 1.43% YTD in 2025 and 3.82% in 2024, this fund shows how every euro that is not taxed gets automatically reinvested. On €100,000, we are talking about an extra €3,820 in 2024 that kept on growing.

- Groupama Trésorerie: It delivered 1.53% YTD in 2025 and 3.98% in 2024. Its track record of more than 30 years demonstrates consistency in harnessing tax deferral. On your capital, that is €3,980 that kept working without tax interruptions.

- BNP Euro Money Market: With 1.28% YTD in 2025 and 3.53% in 2024, it offers the solidity of BNP Paribas. Even with this more conservative return, that is an extra €3,530 that was not lost to annual taxes.

‍

Fund transfers: multiplying the advantages

Money market funds allow TAX-FREE fund transfers (traspasos) under Spanish tax law. This means you can:

• Shift toward fixed income when conditions change (extend duration, take on a bit more credit risk...)
• Rebalance without tax penalties
• Keep the deferral going for decades if you so choose

This flexibility is impossible with interest-bearing accounts, where you are taxed automatically every year.

‍

So, to sum up, the main advantages:

✅ Higher returns: 3% versus the 2% of interest-bearing accounts

✅ Tax deferral: You pay no tax until you redeem, letting all of your money keep working

✅ Uninterrupted compound interest: Every reinvested euro generates more returns year after year

✅ Tax-free transfers: Switch to other funds without triggering tax, keeping the deferral going

✅ Timing flexibility: Decide when to pay tax depending on your personal tax situation

✅ Sufficient liquidity: Access to your money in 2-3 business days

✅ Professional management: Funds run by teams specializing in short-term fixed income

✅ Wealth optimization: With €100,000, you generate an extra €810 in the very first year

✅ Cumulative effect: The advantage multiplies: an extra €4,534 over 5 years, €10,424 over 10 years

✅ No complexity: Simple, conservative, yet tax-smart products

‍

Conclusion: your money deserves to grow without brakes

Every euro that goes to Hacienda each year is a euro that stops compounding. With significant amounts like €100,000, this difference turns into thousands of real euros.

Money market funds don't just offer higher returns: they offer compound growth without tax interruptions. And when you work with sizeable capital, this advantage becomes real money that makes a difference.

Your emergency fund doesn't have to be a dormant account at 2%. It can be a smart growth tool at 3% with a built-in tax advantage.

‍

🎁 BONUS GIFT

If money market funds at 3% already clearly beat interest-bearing accounts, imagine the possibilities with ultra-short-term funds. These products, with slightly longer duration but still highly liquid, have delivered even more attractive returns:

- Ostrum Credit Ultra Short: It has delivered 3.60% over the last 12 months. On your €100,000 investment, that represents an extra €1,600 compared with an interest-bearing account, while keeping all the tax-deferral advantages.

- Groupama Ultra Short Term Bond: With 3.33% over the last 12 months, it offers an excellent balance between returns and conservatism. That is an extra €1,330 a year over an interest-bearing account, all reinvested tax-free until redemption.

- Tikehau Short Duration: Slightly higher up the risk spectrum, but with 3.90% over the last 12 months. For investors looking to get the most out of their conservative liquidity, it represents an extra €1,900 a year.

‍

The key: These funds maintain 2-4 day liquidity and, above all, the same tax deferral. The difference is that they invest in debt with slightly longer maturities (6-18 months vs 3-6 months for pure money market funds), which lets them capture higher returns while keeping a conservative profile.

With €100,000 in Ostrum Credit Ultra Short over 5 years, you would generate roughly an extra €6,000 compared with an interest-bearing account, all compounding without tax interruptions until you decide to redeem.

‍

‍

Keep learning

• Money market funds: what they are and when to use them
• What are Spanish Treasury bills (Letras del Tesoro)?
• The 50 – 30 – 20 method