Monthly 300K KRW for 20 Years: Savings Account Gives 98.5M, S&P500 ETF Gives 227.8M

If you invest ₩300,000 ($217) every month for 20 years, where does the money end up?

Most Korean investors assume they'll comfortably clear ₩100 million. The answer, with a bank savings account at 3%, is ₩98.5 million — below that psychological threshold.

The math is straightforward. Total principal: ₩72 million (₩300K × 240 months). But outcomes diverge dramatically by return rate:

• 3% (Korean bank savings): ₩98.5 million
• 5% (domestic equity ETF): ₩123.4 million
• 7% (global mixed ETF): ₩156.3 million
• 10% (S&P500 ETF): ₩227.8 million

The gap between 3% and 10% scenarios is ₩129.3 million — larger than the entire principal.

SPY's 20-year CAGR stands at 10.49% as of April 2026 (dividends reinvested, per financecharts.com). Korean savings accounts top out at 3.15% before 15.4% withholding tax reduces returns further.

Compounding reveals a critical pattern: at 7%, the final 5 years (years 16–20) generate 51% of total investment gains. Breaking the chain at year 12 means missing the two biggest compounding years.

For 2026, a practical starting point: 50% S&P500 ETF + 30% domestic ETF + 20% short-bond ETF, held inside a Korean ISA account for tax benefits.

For the full simulation breakdown and portfolio strategy in Korean, visit Snakestock.