How to Build a Savings Plan: Calculate Your Goal with Compound Interest

100 euros a month doesn't sound like much - but after 10 years with compound interest, it's over 14,000 euros. And nearly 2,000 euros of that you never deposited. The compound interest effect is your strongest ally in building wealth - and it works harder the sooner you start.

Anyone can build wealth with small amounts. This guide shows you how - with concrete numbers, practical examples, and a free calculator.

How much money should you save each month?

The most important savings rule is called Pay Yourself First: Before you spend money on rent, food, or leisure, first transfer a fixed amount to your savings account. This way you're not saving what's left at month's end - you're saving what you planned.

The proven 50/30/20 rule provides clear guidance: 50% of net income for needs, 30% for wants, 20% for savings. But what does that mean in practice?

Compound interest explained simply - with an example

Compound interest is fundamentally simple: You earn interest on your interest. In the first year, you earn interest on your deposits. From the second year onward, you earn interest on your deposits plus the interest from the previous year. This creates exponential growth - the final years always deliver the most.

Concrete example: You save 200 EUR per month at 3% interest over 10 years.

• Without interest: 24,000 EUR (pure deposits)
• With compound interest: ~27,900 EUR
• Interest earned: ~3,900 EUR for free

The remarkable part: In the first 5 years, you earn about 1,400 EUR in interest. In the second 5 years, it's already 2,500 EUR - nearly double. The longer you save, the harder compound interest works for you.

How to create a savings plan: Step-by-step guide

Step 1 - Define your savings goal

A specific goal motivates more than "just saving." When you know what you're saving for, you stick with it longer. Common savings goals:

• Emergency fund: 5,000 EUR
• Dream vacation: 3,000 EUR
• New car: 15,000 EUR
• House deposit: 40,000 EUR

Our savings calculator includes 4 pre-built templates for exactly these scenarios - with realistic interest rates and durations.

Step 2 - Set and calculate your savings rate

Plan realistically: It's better to save a little less and stick with it than to overcommit and quit after three months. Your savings rate depends on your goal, expected interest rate, and desired timeline.

Is a savings plan worth it starting at just 50 euros a month?

Absolutely. Here are the concrete numbers at 3% interest:

• 50 EUR/month, 10 years = ~7,000 EUR (including ~1,000 EUR interest)
• 50 EUR/month, 20 years = ~16,400 EUR (including ~4,400 EUR interest)

After 20 years, nearly a third of your balance was never deposited by you. That's the power of compound interest - and the reason the best time to start was yesterday. The second best time is today.

Dynamic savings plan - what does an annual increase achieve?

If your salary increases each year, your savings rate should grow with it. Even a 2-3% annual increase makes a huge difference long-term:

• 200 EUR/month flat, 3% interest, 10 years = ~27,900 EUR
• 200 EUR/month +3% annually, 3% interest, 10 years = ~30,500 EUR
• Difference: ~2,500 EUR more

In the savings calculator, you'll find the "Annual Increase" option under Advanced Options. This lets you calculate a dynamic savings plan precisely.

Saving 100 euros a month: How much after 10 years?

One of the most common savings questions. Here's the answer - for different interest rates and durations:

The difference is enormous: At 7% interest, after 20 years you have more than double what a checking account would give you - and over 28,000 EUR of that is pure interest earnings.

How long do I need to save for 10,000 euros?

The higher the savings rate and the better the interest, the faster you'll reach your goal:

How much deposit do you need for buying a house?

The rule of thumb for buying property: You should bring 20-30% of the purchase price as a deposit. This gets you better mortgage rates and avoids excessive monthly repayments.

Example: For an apartment worth 250,000 EUR, you need 50,000-75,000 EUR as a deposit.

That sounds like a lot - but it's achievable. Here's the math:

• 500 EUR/month at 3% interest
• Dynamic: +2% annual increase
• Result after 6 years: ~41,000 EUR

Use the savings calculator to run your own house deposit scenario - including dynamic increases and compound interest.

Tax-free savings allowance: How much interest is tax-free?

In Germany, the Sparerpauschbetrag (saver's lump-sum allowance) applies:

• 1,000 EUR per person (tax-free)
• 2,000 EUR for couples (filed jointly)

Interest earnings above the allowance are subject to a flat tax: 25% plus 5.5% solidarity surcharge = 26.375%.

When do you start paying taxes? At 2% savings interest, you'd need around 50,000 EUR in savings as a single person before exceeding the 1,000 EUR allowance. For most savers, the allowance is sufficient for a long time.

Inflation eats your savings: What can you do?

Inflation means loss of purchasing power: 10,000 EUR today is only worth ~8,200 EUR in 10 years at 2% annual inflation. Your money loses real value even while sitting in an account.

Countermeasures:

• Aim for interest above inflation: Savings accounts at 2-3% at least partially offset inflation. Index fund plans with a historical 5-7% return clearly beat it.
• Increase your savings rate dynamically: When everything gets more expensive, your savings should grow too.
• Watch the real value: Our savings calculator shows the inflation-adjusted value of your savings.

Learn more about inflation and budgeting in our article How to Adjust Your Budget for Inflation.

3 concrete savings plan examples calculated

Building an emergency fund: 5,000 euros in 2 years

An emergency fund is the foundation of any solid financial plan. Here's how to reach 5,000 EUR in 2 years:

• Starting balance: 500 EUR
• Interest rate: 2.5% (savings account)
• Required savings rate: ~190 EUR/month
• Interest earned: ~80 EUR

Use the savings calculator in Goal Mode to calculate your exact emergency fund plan.

Saving together as a couple: 500 euros per month over 20 years

What happens when you save consistently as a couple over the long term?

• Savings rate: 500 EUR/month (250 EUR per person)
• Interest rate: 5% (index fund)
• Dynamic increase: +2% annually
• Result after 20 years: ~250,000 EUR
• Of which ~100,000 EUR is pure interest earnings

GoodShare helps you track savings goals together - with real-time sync and shared budgets.

House deposit: 40,000 euros in 7 years

• Savings rate: 300 EUR/month
• Interest rate: 3%
• Dynamic increase: +3% annually
• Milestones: 10,000 EUR (25%), 20,000 EUR (50%), 30,000 EUR (75%), 40,000 EUR (100%)

Milestones help you stay motivated. Every milestone reached is a reason to celebrate.

Common savings mistakes to avoid

• Starting too late: Every year without compound interest is lost money. Starting 10 years later can mean 30-50% less final wealth.
• Setting the savings rate too high and quitting: Better to save 100 EUR consistently than 300 EUR for three months and then nothing.
• Keeping savings in a checking account: At 0% interest, your money doesn't work for you. Every euro in a checking account loses value through inflation.
• Not using tax-free allowances: 1,000 EUR in interest per year is tax-free. Use this advantage by setting up a tax exemption order at your bank.
• Ignoring inflation: Only looking at nominal returns creates an illusion about real wealth growth.

Find more typical mistakes in our article 5 Budget Tracking Mistakes to Avoid.

Frequently Asked Questions about Savings Plans

How much should I save per month?

The 50/30/20 rule recommends 20% of net income. On 2,500 EUR that's 500 EUR. But any amount counts - even 50 EUR monthly becomes around 7,000 EUR after 10 years at 3% interest.

What is compound interest and how does it work?

With compound interest, you earn interest not only on your deposits but also on previously earned interest. This creates exponential growth. 200 EUR/month at 3% yields ~3,900 EUR in pure interest after 10 years.

How do I calculate how long it takes to reach a savings goal?

Use the Goal Mode in the GoodShare Savings Calculator. Enter your savings goal and your monthly contribution - the calculator shows the required duration including compound interest.

Is a savings plan worth it for small amounts?

Yes! 50 EUR/month at 3% interest = ~7,000 EUR after 10 years. After 20 years even ~16,400 EUR. Consistency is the key, not the amount.

What does increasing the savings rate annually achieve?

At 200 EUR/month with +3% annual increase, you reach ~30,500 EUR after 10 years instead of ~27,900 EUR with a flat rate. That's ~2,500 EUR more - without noticeable sacrifice.