Top 10 Money Mistakes — and How to Avoid Them

Most personal finance content is generic — '10 ways to save money' that apply equally to a UC Davis RN, a Texas oil engineer, and a college kid. This list is California public-sector specific: the mistakes that actually cost UC, CalPERS, CalSTRS, and FERS workers the most over a career.

Top mistakes, ranked by lifetime dollar impact:

1. Not maxing the 457(b) in addition to the 403(b) — UC and most state/local public agencies offer BOTH, with separate $24,500 limits. Most employees only contribute to one. Cost over 25 years at 7% real: $750,000+.
2. Claiming Social Security at 62 when delaying to 70 would produce a 76% larger benefit for life. For a household with both spouses delaying the higher earner, the survivor effect can compound to $300,000+ over a 30-year retirement.
3. Not doing Roth conversions in the gap years between retirement and Social Security/RMDs. UC retirees especially have a 5-8 year low-bracket window when conversions cost 12% federal instead of 24%+. Skipping it costs $50,000-$150,000 in lifetime tax.
4. Missing UC After-Tax DCP for mega-backdoor Roth. UC's 415(c) cap is $72,000 (2026) — most employees use only the $24,500 elective limit.
5. Buying too much house — house-poor budget destroys retirement savings throughout career.
6. Not refinancing when rates dropped below your existing mortgage rate by 1%+ — missed opportunity in 2019-2021 cost millions of California homeowners $50k-$150k each.
7. Lifestyle inflation after promotion — savings rate stays the same instead of capturing the raise.
8. Not understanding survivor benefit elections — CalPERS option 2W vs. option 3W vs. unmodified can swing surviving spouse income by $2,000+/mo.
9. Cash-out refinances to consolidate debt — converting unsecured debt to debt secured by your home.
10. Permanent life insurance sold as 'forced savings' instead of investing the premium difference in a low-cost index fund.

Each mistake on the list includes:

• The numbers — lifetime dollar cost of the mistake, computed for a typical UC / state / FERS employee household
• The fix — specific corrective action, with deadlines if applicable
• The relevant tool — direct link to the calculator that models the corrective action's impact in your specific situation

Pick the mistakes that apply to you; ignore the ones that don't. The list is comprehensive but not all 10 apply to every household.

Ready to run the numbers?

Each mistake includes the lifetime cost, the corrective action, and a link to the relevant calculator. Ranked by dollar impact for California public-sector households.

Read the full list →

What's the single biggest mistake?

Not maxing all available tax-advantaged retirement space. For a UC employee with $24,500 elective deferral capacity in 403(b) PLUS another $24,500 in 457(b) PLUS the After-Tax DCP mega-backdoor up to the $72,000 415(c) cap, the total annual tax-deferred capacity is $72,000. Most employees use only $24,500 — leaving $47,500/year unused. Over 25 years at 7% real return, that's $3.0M of foregone retirement wealth.

How can someone claim Social Security wrong?

Claiming at 62 = 75% of full benefit, permanent reduction. Claiming at 70 = 124% of full benefit (8%/year delayed retirement credit). For a married couple, the higher earner should delay as long as possible because that's the survivor benefit — when one spouse dies, the survivor steps up to whichever benefit is higher. Claiming the higher earner early permanently reduces what the surviving spouse will live on. The break-even is around age 80; for those expecting to live to 85+, delaying always wins.

How much can lifestyle inflation cost?

Massive. Imagine a UC RN going from step 5 to step 10 over 5 years — base pay rises ~30%, take-home rises ~$15k/year. If 100% of that goes to lifestyle (new car, bigger house, more travel), the savings rate stays the same and the career-end retirement balance is unchanged. If 50% of the raise is captured as additional savings, the additional contributions over a 25-year career grow to $400,000+ at 7% real.

Is whole life insurance really a mistake?

For most people, yes. Whole life policies have high upfront commissions (often 100% of year-1 premium goes to the agent) and low internal returns (4-5% net of fees in good cases). Term life insurance + invest the premium difference in low-cost index funds beats whole life by $200k-$600k over a 30-year horizon in most scenarios. Whole life makes sense in narrow cases: estate planning for $13M+ estates that need liquidity at death, or as a Modified Endowment Contract for ultra-high earners exhausting other tax-advantaged space.