A PhD is a weird degree – it’ll hold you back at the beginning of your career, but towards the end, it will be an invaluable asset.
Right after you finish your Ph.D., you’ll find that you’re overqualified for most entry-level positions, and the few openings there are for Ph.D.’s with 0–2 years of experience will be swamped with thousands of applications due to the massive overproduction of PhDs globally. Getting your first few positions is a difficult struggle.
However, towards the mid-to-late career, a Ph.D. can help you get promoted since companies like having highly educated individuals in the executive team. It helps with the corporate image.