Yes, a financial plan is recommended because an investment portfolio is just one part of your financial world. Having both leads to better results.
A financial plan connects your investments to your goals, income needs, taxes, and long-term decisions, so each financial decision supports the next. Without that context, it can be harder to know if your portfolio is truly aligned with what you’re trying to achieve. Some people choose to focus only on investments, but combining both provides clearer direction.
