If I was to choose only one ETF for a retirement portfolio, what should it be?

Choosing just one ETF for a retirement portfolio is a bold move, and it should be based on your personal circumstances, risk tolerance, and investment goals. However, if you were to choose just one ETF, here are a few options to consider: 1. **Vanguard Total Stock Market ETF (VTI)**: This ETF tracks the performance of the U.S. stock market, including small-, mid-, and large-cap stocks. It's a low-cost option with a broad exposure to the domestic equity market, making it a solid choice for a retirement portfolio. 2. **iShares Core S&P 500 ETF (IVV)**: If you prefer to focus on large-cap stocks, IVV is a low-cost option that tracks the S&P 500 index. This ETF provides a diversified exposure to 500 leading U.S. companies. 3. **Vanguard Dividend Appreciation ETF (VIG)**: If you're looking for a more focused approach, VIG invests in companies that have a history of increasing dividends. This can provide a steady stream of income and are often associated with stable or growing earnings. Ultimately, the choice of a single ETF for a retirement portfolio depends on your individual circumstances and investment objectives. It's essential to consider factors such as your risk tolerance, investment horizon, and the need for income versus growth. If possible, consult with a financial advisor to help you make an informed decision based on your specific situation.