Invest vs Repay Debt
Compare the financial benefit of investing extra money versus using it to repay debt faster.
Enter Your Values
Using shared profile · 3,500/mo · EUR — edit on Dashboard
Results update automatically as you change values.
What-If Scenarios
Results update instantlyCost Breakdown
Repay vs Invest Comparison
Click chart to expand
Side-by-Side Comparison
Bars show relative size · ✓ marks the better option- 10-Year Benefit
- €2,050
- Effective Rate
- 6.0%
- 10-Year Benefit
- €31,473
- Effective Rate
- 8.0%
| Factor | Repay Debt | Invest |
|---|---|---|
| 10-Year Benefit | €2,050 | €31,473 |
| Effective Rate | 6.0% | 8.0% |
At 6.0% debt vs 8.0% expected returns, Split is the mathematically stronger choice. High-interest debt (>6%) should usually be repaid first.
Scenario Analysis
How the outcome shifts if your assumptions turn out better or worse than expected.
Best-case outcome with favorable assumptions.
Most likely outcome based on your inputs.
Conservative outcome with cautious assumptions.
Compare Scenarios
Pin up to 3 and see them side by sideSet your inputs, then Pin current to save this scenario. Pin a few variations to compare their scores and outcomes here.
What Moves the Needle Most
How much each factor changes your Interest Saved (Repay) across its full range. Extra Amount has the biggest impact.
Focus your attention on Extra Amount — getting it right matters most. Factors lower down move the result less, so rough estimates there are fine.
Confidence & Assumptions
The outcome is fairly stable across best and worst cases — this is a robust decision.
Interest Saved (Repay): €2,050 (worst) → €2,050 (expected) → €2,050 (best)
These are the estimates the result depends on. Adjust them (and the Advanced inputs) to match your real situation — the closer they are to reality, the more reliable your decision.
These estimates are for informational purposes only and do not constitute financial advice. Actual results may vary based on factors not captured in this calculator.
How This Calculator Works
What this calculator does
Compare the guaranteed benefit of repaying debt against the potential benefit of investing.
How the calculation works
Calculates total interest saved from extra debt payments vs total investment gains from the same amount.
Formula
Compare: Interest Saved vs FV(Monthly Extra, Return Rate, Months) − Total Contributed
Example
With €20,000 debt at 6% vs 8% investment returns, investing €500/month wins — but debt repayment is guaranteed.
How to Use This Calculator
- 1Enter your numbers
Fill in the inputs for Invest vs Repay Debt. Defaults are realistic starting points — replace them with your actual figures.
- 2Understand the calculation
Calculates total interest saved from extra debt payments vs total investment gains from the same amount.
- 3Review results and scenarios
Check metrics, cost breakdown, comparison tables, and best / expected / worst scenarios. Use sliders to stress-test assumptions.
- 4Decide with the verdict
Read the decision engine recommendation and FAQ. Example: With €20,000 debt at 6% vs 8% investment returns, investing €500/month wins — but debt repayment is guaranteed.
Factors to Consider
- High-interest debt (>6%) usually should be repaid first
- Investment returns are not guaranteed
- Psychological benefit of being debt-free matters
Common Mistakes
- Ignoring risk difference between guaranteed and market returns
- Not maintaining emergency fund while deciding
Frequently Asked Questions
What debt rate is "high"?+
Generally above 6-7%. Below that, investing often wins mathematically. But personal comfort with debt matters too.
This calculator provides estimates for informational purposes only and does not constitute financial, investment, tax, or legal advice. Always consult a qualified professional before making important financial decisions.
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