Scenario 1: Leaving the Money in the Bank
Each year, Richard earned 5% interest. However, Spain taxed those annual gains at 26%, meaning he was only compounding on what was left after tax.
(Note: While 5% is well above typical long-term interest rates, this figure is used to highlight the negative impact of tax on compounding.)
Effective annual growth: Just 3.7% (after tax)
Value after 20 years: €202,269
What it cost him: Thousands in lost growth potential
What looked like a safe, straightforward approach turned out to be far less efficient than it could have been.
Scenario 2: Using a Spanish Tax-Compliant Bond
A friend introduced Richard to a financial adviser, who explained the numerous benefits of Spanish tax-compliant bonds — fully legal investment vehicles often underused by expats. These structures allow investments to grow tax-free until funds are withdrawn.
Richard invested the same €100,000 into a compliant bond, again earning 5% annually. But unlike the bank account, no tax was deducted each year, allowing the full amount to compound uninterrupted.
After 20 years:
Bond value: €265,330
Tax due on gain (€165,330): €42,986
Net amount after tax: €222,344 — €20,075 more than the bank account
Compound Growth Comparison (No Withdrawals)
The graph shows how the tax-compliant bond (orange dashed line) outperforms the bank account (solid line) over time, thanks to tax deferral. Even after paying tax at the end, the bond delivers a much higher return.