Vivian Tu, a prominent financial educator and author, has publicly advised individuals to halt investment contributions if they are currently carrying credit card debt. Tu’s argument centers on the mathematical reality of compound interest: credit card interest rates often reach 20% or higher, significantly outpacing the historical average annual return of the S&P 500, which typically hovers around 7% to 10%.

Tu contends that paying off high-interest debt provides a guaranteed 'return' equivalent to the interest rate saved, whereas investing in the market carries inherent risk and lower expected gains. By prioritizing debt repayment, she suggests that individuals can avoid the long-term erosion of their net worth caused by high-interest charges. This perspective aligns with traditional financial planning advice, which generally suggests that high-interest consumer debt should be cleared before pursuing wealth-building vehicles like brokerage accounts or retirement funds.

While the mathematical logic is widely accepted by financial planners, some market participants argue that missing out on early-stage compounding in the stock market can be costly. However, Tu maintains that the 'math' is indisputable, noting that the cost of carrying debt often negates any potential gains made in the market. The advice serves as a foundational principle for personal finance, emphasizing debt elimination as a prerequisite for sustainable long-term investing.