HDHP Saves $1,800/Year if You're Healthy. Costs $3,400/Year Extra if You're Not.
The Annual Enrollment Gamble
Every year, you stare at two health insurance options and guess. High deductible with lower premiums, or low deductible with higher premiums? There’s a better way than guessing.
The Core Trade-Off
- Low deductible plan: Higher monthly premiums, lower out-of-pocket when you use healthcare
- High deductible plan (HDHP): Lower monthly premiums, higher out-of-pocket until you hit the deductible
The question is: does the premium savings from the HDHP exceed the extra out-of-pocket risk?
A Real Comparison
| Low Deductible | High Deductible | |
|---|---|---|
| Monthly premium | $450 | $280 |
| Annual premium | $5,400 | $3,360 |
| Deductible | $500 | $2,800 |
| Out-of-pocket max | $4,000 | $6,500 |
| Premium savings | — | $2,040/year |
You save $2,040/year in premiums with the HDHP. Now model three scenarios:
Scenario 1: Healthy Year
You barely use healthcare — just an annual checkup ($200).
- Low deductible total: $5,400 + $200 = $5,600
- High deductible total: $3,360 + $200 = $3,560
- HDHP saves: $2,040
Scenario 2: Moderate Use
A few doctor visits and a minor procedure ($3,500 in medical bills).
- Low deductible total: $5,400 + $500 (deductible) + $600 (copays) = $6,500
- High deductible total: $3,360 + $2,800 (deductible) + $140 (coinsurance) = $6,300
- HDHP saves: $200
Scenario 3: Heavy Use
A surgery or major health event ($15,000+ in bills).
- Low deductible total: $5,400 + $4,000 (out-of-pocket max) = $9,400
- High deductible total: $3,360 + $6,500 (out-of-pocket max) = $9,860
- Low deductible saves: $460
The HSA Advantage
With an HDHP, you qualify for a Health Savings Account. Contributing $3,000/year saves roughly $750-$1,000 in taxes (depending on your bracket). Factor that in and the HDHP wins in almost every scenario.
The Breakeven Point
Your breakeven is the amount of medical spending where both plans cost the same. Below that number, HDHP wins. Above it, low deductible wins. For most healthy adults under 50, the HDHP comes out ahead.
Where the math doesn’t decide for you
- Variance tolerance. Two plans with identical expected cost have very different worst-case outcomes. HDHP exposes you to a $5K-7K out-of-pocket max year if something major happens; low-deductible caps it at $1-2K. Some people pay more for predictability — that’s a legitimate preference, not a math error.
- HSA discipline. The HDHP+HSA strategy depends on actually contributing to and not raiding the HSA. If you’d spend the saved premium on consumption instead of HSA contributions, the tax shield benefit disappears.
- Network access. Some HDHPs have narrower networks. The math doesn’t capture “had to drive 90 minutes to find an in-network specialist.”
- Major life events on the horizon. Pregnancy, planned surgery, a new chronic diagnosis — these flip the comparison toward low-deductible regardless of last year’s spending pattern.
What to actually do
- Pull last year’s actual healthcare spending from your insurance statements.
- Adjust for known changes (new dependents, planned procedures, chronic conditions).
- Run both plans through the calculator at that spending level + a low-utilization scenario + a high-utilization scenario.
- If two of three scenarios favor HDHP and you have HSA discipline: HDHP wins.
- If predictability matters more than expected cost: low-deductible plan, even if math says otherwise.
Open the Health Insurance Comparison Calculator → and run your specific plans + spending forecast. The break-even is the only number that matters; everything else is intermediate.