Why Traditional HSA Programs Fail to Improve Employee Health

In 2024, American employers contributed an estimated $52 billion into Health Savings Accounts. That number has grown steadily for over a decade. And yet, employee health outcomes have not improved at anything close to a proportional rate. Chronic disease prevalence continues to rise. Absenteeism remains stubbornly high. Healthcare costs keep climbing. Something in the model is broken.

The question is not whether HSAs have value as a financial vehicle. They do. The tax advantages are real, and for employees who actively manage their health spending, they can be a useful tool. The question is whether HSAs, as currently designed, do anything to change the health behaviors that drive the majority of employer healthcare costs. The evidence suggests they do not.

The Structural Problem with HSAs

Traditional HSAs were designed as savings instruments, not behavior change tools. Their core mechanic is accumulation: money goes in, sits in an account, and gets spent when a health expense arises. There is no feedback loop connecting the existence of the account to any specific health action. An employee with $3,000 in their HSA is no more likely to go for a morning walk than an employee without one.

This is not a minor design flaw. It is the central limitation. The National Bureau of Economic Research published a working paper in 2023 examining high-deductible health plans paired with HSAs and found that while these arrangements reduced healthcare spending in the short term, they did so primarily by discouraging utilization across the board, including preventive care. Employees were not making healthier choices. They were just spending less on all healthcare, good and bad.

Source: Brot-Goldberg et al., "What Does a Deductible Do? The Impact of Cost-Sharing on Health Care Prices, Quantities, and Spending Dynamics," Quarterly Journal of Economics, 2017. Updated analysis published as NBER Working Paper, 2023.

The Utilization Gap

One of the most striking data points in the HSA landscape is how few employees actually use their accounts for preventive health purposes. According to the Employee Benefit Research Institute, roughly 55% of HSA account holders made no withdrawals at all in a given year. Among those who did, the vast majority of spending went toward reactive care: prescriptions, doctor visits for existing conditions, and medical procedures.

The pattern is clear: HSAs function as savings vehicles or emergency funds, not as proactive health tools. The money accumulates, but behavior does not change. For employers whose stated goal is a healthier workforce, this represents an enormous disconnect between intent and outcome.

Why Passive Benefits Fail to Drive Behavior Change

Behavioral science has established, through decades of research, that passive incentives are weak drivers of complex behavior. Health behaviors are particularly resistant to change because they involve daily decisions, social context, habit formation, and emotional regulation. Simply having money available does not address any of these barriers.

Daniel Kahneman and Amos Tversky demonstrated in their foundational work on prospect theory that people respond more strongly to immediate, concrete rewards than to abstract future benefits. An HSA balance is, by design, an abstract future benefit. It sits quietly in an account. It does not prompt action. It does not provide feedback. It does not connect the experience of exercising today to a tangible reward tomorrow.

Contrast this with conditional incentive structures, where a specific action (walking 8,000 steps, completing a health screening, attending a nutrition consultation) triggers an immediate, visible reward. The behavioral economics literature is consistent on this point: specificity and immediacy matter far more than magnitude when it comes to sustained behavior change.

Source: Kahneman, D. & Tversky, A., "Prospect Theory: An Analysis of Decision under Risk," Econometrica, 1979. See also: Loewenstein, G. et al., "Can Behavioural Economics Make Us Healthier?" BMJ, 2012.

The Employer Cost Paradox

Here is the uncomfortable math. The average employer HSA contribution for a family plan was $1,274 in 2024, according to the Kaiser Family Foundation. Multiply that across a workforce of 5,000 employees and you get $6.37 million in annual contributions. If those contributions do not reduce healthcare claims, do not lower absenteeism, and do not improve productivity, then the ROI is effectively zero from a health outcomes perspective.

The tax advantages still apply, of course. Employees benefit from pretax savings, and employers avoid payroll taxes on contributions. But if the goal is improving population health, then measuring success by tax savings alone is moving the goalposts. The original promise of HSAs in the benefits ecosystem was that consumer-directed health plans would make employees better stewards of their own health. That promise has not materialized.

Mercer's annual survey of employer health benefits found that 71% of large employers (500+ employees) expressed dissatisfaction with the health impact of their current benefits programs in 2024. The dissatisfaction is not with the financial structure. It is with the outcomes.

Source: Mercer National Survey of Employer-Sponsored Health Plans, 2024.

What Would a Better Model Look Like?

The alternative is not to abandon health spending accounts entirely. The tax-advantaged structure has genuine value for employees managing healthcare costs. The alternative is to recognize that a savings account, on its own, is insufficient as a health improvement strategy, and to build systems that connect employer spending to verified health actions.

An outcome-based model starts from a different premise: instead of giving employees money and hoping they make healthy choices, you define specific health behaviors, verify that employees complete them, and release funds only upon verification. The employer's cost per employee drops, because spend only occurs when behavior occurs. The employee's motivation increases, because the reward is concrete and immediate.

The key ingredients of such a model are three:

1. Specificity. The health behaviors must be clearly defined and measurable. "Be healthier" is not a behavior. "Walk 7,000 steps per day for 20 days this month" is.
2. Verification. The behaviors must be objectively confirmed, not self-reported. The proliferation of health tracking devices, particularly Apple Health's aggregation capabilities, makes this possible at scale for the first time.
3. Conditionality. The payout must depend on verified completion. This is the mechanism that transforms passive spending into active incentive. No verification, no payout. The employer only pays for outcomes that actually occurred.

The Evidence for Conditional Health Incentives

A randomized controlled trial published in the Annals of Internal Medicine in 2016 tested financial incentives for physical activity among overweight and obese adults. The study found that participants in a loss-framed incentive group (where money was deposited into an account and forfeited if goals were not met) achieved their step goals 45% of the time, compared to 30% for a gain-framed group and 30% for the control. The effect persisted for the duration of the 26-week intervention.

A larger study by Patel et al. in 2018, also in the Annals of Internal Medicine, confirmed these findings and extended them, showing that financial incentives combined with social accountability components produced the strongest and most durable behavior change. The effect sizes were meaningful: participants in the incentive groups increased daily step counts by an average of 1,500 steps and maintained that increase for months after the incentive period ended.

Source: Patel, M.S. et al., "Framing Financial Incentives to Increase Physical Activity Among Overweight and Obese Adults," Annals of Internal Medicine, 2016. Patel, M.S. et al., "Effect of a Game-Based Intervention Designed to Enhance Social Incentives to Increase Physical Activity," JAMA Internal Medicine, 2019.

Where This Leaves Employers

The trajectory is clear. Employers are spending more on health benefits each year and getting less in return. Traditional HSAs serve an important financial function, but they were never designed to change behavior, and decades of data confirm that they do not.

The next generation of health benefits will be defined by accountability. Not accountability imposed on employees through penalties and restrictions, but accountability built into the structure of incentives themselves. When spending is tied to verified actions, both sides benefit: employers get measurable health improvements, and employees get immediate, tangible rewards for taking care of themselves.

The technology to verify health behaviors at scale now exists. The behavioral science supporting conditional incentives is robust and well-replicated. The only remaining question is whether employers will continue pouring money into passive accounts and hoping for the best, or whether they will demand verified outcomes for every dollar spent.

Slynk provides outcome-based incentive infrastructure that replaces passive health spending with verified behavior rewards. Employers define the outcomes, employees earn the rewards, and every dollar is tied to a real health action.