What the phrase means
"Buy term and invest the difference" is a simple plan. First, you buy an affordable term life policy that covers your family for the years they depend on your income. Then you take the money you would have spent on a costly permanent policy and save it in your own separate account.
The core idea is to keep two jobs separate. Insurance protects your family if you pass away. Saving and investing builds your wealth over time. Permanent policies like whole life and IUL try to do both in one product, and that combination usually costs more and delivers less than doing each on its own.
Why the cost gap matters
Permanent policies can cost 10 to 15 times more than term for the same death benefit. That gap is the "difference." With term, you get the same protection for a fraction of the price, which frees up real money every month.
What you do with that freed-up money is the whole point. Put toward your own retirement or savings accounts, over 20 or 30 years the goal is that it grows into a cushion your family can lean on. By the time the term ends, the idea is that your mortgage is paid down, your kids are grown, and your savings carry the weight that insurance used to.
The honest trade-offs
This plan is not automatic, and we will not pretend it is.
It takes discipline. The savings only build if you actually invest the difference every month instead of spending it. Term also expires. If you outlive the term and still need coverage, a new policy at an older age costs more, so match the term length to how long your family will need the money. And investing carries risk. Markets rise and fall, and there is no guaranteed return. That is why this is a principle to understand, not a promise.
When permanent coverage can still make sense
Term fits most families, but not everyone. Permanent coverage can be reasonable for lifelong needs, such as a dependent with special needs, certain estate situations, or covering final expenses when no term option is left. The point is to choose it on purpose, for a clear reason, not because it was sold as an investment.
For veterans weighing a VA option
If you are comparing this to keeping VGLI, see VGLI vs term life, since VGLI premiums rise with age while term stays level. For the full picture of your choices, start with veteran life insurance, explained, and to protect a spouse or children, see life insurance for military families.