The core difference
Both provide a life insurance death benefit. Everything else is different.
Term Life Insurance is the most cost-efficient way to buy protection during your working years. Fixed premium, fixed term (10/20/30 years), no cash value, no investment component. When the term ends, coverage ends. Simple, transparent, affordable.
Indexed Universal Life (IUL) is a permanent policy with flexible premiums and a cash-value account linked to a market index. Gains are capped but floors at 0% — you participate in up markets and don't lose in down markets. Cash grows tax-deferred and can be distributed tax-free via policy loans in retirement. Premiums run 5–10x higher than equivalent term coverage.
The Term Life case
For most working adults, Term Life is the correct answer. The protection need — income replacement during working years — is temporary. A 35-year-old with kids gets 20-year Term Life, pays $25–$35/month for $500,000 of coverage, and the policy expires when the kids are grown and the mortgage is paid off. Zero complexity.
The IUL case
IUL makes strategic sense when: (1) you've maxed your 401(k) and Roth IRA and are looking for additional tax-advantaged retirement income; (2) you're a high-income earner in your 30s or 40s who can sustain $1,000+/month in premiums for 20+ years; and (3) you need permanent coverage, not just working-years coverage. Outside those conditions, the extra cost doesn't deliver commensurate value.
Making the decision
Start with an honest assessment of your income and tax situation. If you haven't maxed your Roth IRA, do that before exploring IUL. If you have, IUL is worth a detailed illustration from an independent agent who can model realistic vs. illustrated returns. For everyone else, Term Life — priced honestly and sized correctly — is the clearest path.