Every November, federal employees across the country sit down with the OPM plan comparison tool, scroll through a list of 150-plus options, and make the same mistake: they pick the plan with the lowest premium. That number is visible. It shows up on every paycheck. What does not show up — until you are sick — is the true annual cost of the plan you chose.
The Federal Employees Health Benefits Program is one of the most generous employer-sponsored health benefits in the country. But generous does not mean simple. The structure is deliberately complex, and OPM is not going to optimize the selection for you. That is your job. And unlike the military buyback — which is a one-time decision with a clear formula — FEHB plan selection is a decision you have to revisit every single year.
The government's ~72% premium contribution is calculated against the nationwide average plan premium — not your specific plan's premium. Every dollar above that average comes entirely out of your pocket. Choose accordingly.
Section IThe number that actually matters: total annual cost
Premium is only one dimension of cost. The metric that tells you what a plan actually costs in a given year is total annual cost: your out-of-pocket premium share plus your expected medical expenses — deductibles, copays, coinsurance, and prescription costs. OPM publishes this estimate for three utilization scenarios in the plan comparison tool. Most people glance at it once. The employees who optimize their FEHB enrollment use it as the primary decision input.
The math is straightforward. Pull your last 12 months of Explanation of Benefits statements from your current carrier. Tally your actual utilization: primary care visits, specialist visits, prescriptions by tier, and any imaging or procedures. Then map that utilization against each plan's Summary of Benefits — not the brochure, the actual SBC document. Add your employee premium share (biweekly deduction × 26) to your projected out-of-pocket. That number is your total annual cost. Compare it across three to five plans before making a decision.
| Plan Type | Best Fit | Key Trade-off |
|---|---|---|
| Fee-for-Service (FFS) | Employees with established specialists or who travel frequently | Higher premium; maximum provider flexibility |
| HMO | Employees in a metro area with predictable, in-network care | Lower out-of-pocket; must stay in-network |
| HDHP + HSA | Healthy employees who can absorb the deductible and want a tax vehicle | Higher deductible; triple tax advantage on HSA |
| Consumer-Driven (CDHP) | Employees who want HRA seed funding with moderate cost-sharing | HRA offset by higher cost-sharing above it |
| Exclusive Provider (EPO) | Employees comfortable with a fixed network, no PCP gatekeeper | No referrals required; no out-of-network coverage |
Section IIWhen the HDHP and HSA combination wins
For federal employees who are generally healthy and can absorb a higher deductible in a bad year, the High Deductible Health Plan paired with a Health Savings Account is often the structurally superior choice — not because the premium is lowest, but because of the HSA's triple tax advantage. Contributions go in pre-tax, grow tax-free, and come out tax-free for qualified medical expenses. No other account in the federal benefits ecosystem offers that.
HSA funds roll over indefinitely. Once your balance exceeds a threshold — typically $1,000 to $2,000 depending on the plan's custodian — you can invest the excess in mutual funds. At age 65, HSA funds can be withdrawn for any purpose penalty-free, which makes a maxed HSA function as a supplemental retirement account for healthcare costs. A federal employee at the 22% bracket who contributes the full 2026 self-only limit of $4,300 saves approximately $946 in federal income tax alone — before state tax savings or the payroll tax exemption on payroll-deducted contributions.
A healthy employee who switches from a $0-deductible FFS plan to an HDHP and deposits the premium savings into an HSA will often end the year ahead financially — even in a year with moderate medical expenses.
Section IIIOpen Season: what you can and cannot change
Open Season runs from the second Monday of November through the second Monday of December each year. Changes take effect January 1. Outside of Open Season, you can only change your FEHB enrollment if you experience a qualifying life event — marriage, divorce, birth or adoption, loss of other coverage, or a change in employment status.
What most employees do not realize is that failing to make an active election during Open Season is itself a decision: you stay in your current plan at whatever the new premium rates are. Plans frequently change their cost-sharing structures, formularies, and network coverage from year to year. A plan that was optimal last year may not be optimal now. The only way to know is to run the numbers.
- Check your plan's rate notice in October. OPM releases the following year's premiums before Open Season opens. If your plan had a significant rate increase, start shopping immediately.
- Use the FEHB plan comparison tool at OPM.gov. Filter by plan type and sort by total annual cost for your estimated utilization level — not by premium.
- Verify your doctors and prescriptions are covered. Network changes happen every year. Confirm before you enroll, not after.
- If you are considering an HDHP, check HSA custodian quality. Investment options, fees, and account management vary significantly between custodians. This is not a minor detail.