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Home/Markets & Investing/WARREN BUFFETT

High-interest debt repayment outperforms any investment strategy

SH

Spencer Harmon

Warren Buffett · Apr 13, 2026

High-interest debt repayment outperforms any investment strategy

Source: DojiDoji Data Terminal

Repaying high-interest debt is a priority over any investment idea. A $10,000 debt at an 18% rate can put a person in trouble for the rest of their life. This comes from Warren Buffett's philosophy that risking what you have for something you do not need is insane.

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A $300 Monthly Investment in the S&P 500 Can Reach $1.08 Million Over 35 Years

An investor who consistently contributes $300 every month to a low-cost S&P 500 index fund for 35 years accumulates approximately $1.08 million. This outcome is based on the index's annualized average return of 10.5% over the past 50 years, including reinvested dividends. The strategy is advocated by Warren Buffett, who suggests that low-cost index funds beat the majority of professional money managers over long horizons. Buffett highlights the importance of minimizing fees, noting that a 1% annual management fee can consume more than $200,000 in compounding gains on a path to a $1 million portfolio. He recommends index funds with expense ratios as low as 0.03%.

The average US credit card interest rate now hovers around 21%, a 45% increase compared to 2020. US credit card balances grew by $44 billion in Q4 2025 to $1.28 trillion. Average total household debt reached $18.8 trillion during the same quarter. Transitions into severe delinquency for credit card balances, mortgages, and student loans increased in Q4 2025.

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mortgage rates

Adjustable-rate mortgages offer a low-cost entry for buyers facing 6% fixed rates

Borrowers may find lower introductory rates and easier qualification standards, including debt-to-income ratios up to 50%, by opting for adjustable-rate mortgages. These loans provide a fixed rate for an initial period—typically three, five, seven, or 10 years—before entering an adjustment period. This shift comes as the average 30-year fixed-rate conforming mortgage stands at 6.276%, with 30-year FHA, VA, and USDA loans averaging 6.067%, 5.875%, and 5.962% respectively. The Federal Open Market Committee maintained the federal funds rate at 3.50% to 3.75% during its March 17-18 meeting. Once the introductory period expires, ARM rates fluctuate based on the Secured Overnight Financing Rate (SOFR) plus a lender-set margin typically ranging from 2% to 3.5%. The risk of this fluctuation is quantified by the rate caps; a rise from 7% to 12% on a $400,000 principal would increase a monthly payment by $1,453.

Warren Buffett

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