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2026 HSA and Health FSA Contribution Planner

Check 2026 HSA contribution room, plan a health FSA election and unused-fund risk, and estimate tax effects separately using applicable rates.

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Inputs that matter
Personal limit method, Eligible self-only months, Eligible family months, Age 55 or older at year end, and 18 more
Output to expect
Planned contributions over limit, Illustrative unused amount at risk, Illustrative tax reduction
  • Check the units and required inputs before comparing results.
  • Keep the assumptions with a copied result so you can reproduce the calculation later.
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Reference & details

How it works

2026 HSA limits and counted sources

Annual HSA limits are $4,400 for self-only and $8,750 for family coverage before applicable adjustments. The eligible age-55 catch-up is $1,000. Employer, employee and other counted contributions share the applicable personal limit. The monthly worksheet prorates first-day eligible months and rounds down to cents.

Source: IRS Revenue Procedure 2025-19

Personal eligibility and special limits

Confirm eligibility including other coverage, Medicare and dependent status. The monthly worksheet does not apply the last-month rule; use a separately verified personal limit for that rule or complex spouse allocations. Its eligibility testing period can extend into the following year. Some 2026 qualifying-plan rules changed; do not decide eligibility from a deductible alone.

Source: IRS Publication 969

New eligibility guidance

2026 guidance includes treatment of qualifying bronze and catastrophic plans and other changes. Verify the current plan and personal conditions with the administrator or adviser. This planner accepts confirmed eligible months; it does not classify insurance plans.

Source: IRS Notice 2026-05

Health FSA election and unused funds

For plan years beginning in 2026, employee salary reductions are limited to $3,400; an employer may set a lower cap. A permitted outgoing carryover can be no more than $680. Employer funding and an approved incoming carryover are separate from the employee election. Confirm the actual plan policy and eligibility.

Source: IRS 2026 inflation adjustments

Plan deadlines and spending assumptions

A health FSA may offer a carryover or grace period, not both. A claim-submission run-out period does not extend the period for incurring expenses. The worksheet uses expected eligible unreimbursed expenses and shows hypothetical unused funds; it does not approve claims or determine final forfeitures.

Source: IRS Publication 15-B (2026)

Separate tax-effect arithmetic

Use only an eligible employee-funded amount and marginal rates that apply to that contribution. Direct HSA contributions use zero payroll-tax reduction. Eligible cafeteria-plan salary reductions may have a different effect; no automatic 7.65% rate is added. The combined tax reduction rounds once to cents, with separately rounded components reconciled to the total.

Illustrative reduction = round(contribution × combined applicable rate, cents); net employee cost = contribution − reduction

Updated: September 2026

Example Scenarios

2026 self-only eligibility for 12 months, no catch-up or reductions, $500 employer funding, $1,000 own already paid and $2,900 additionally planned.

→ $4,400 counted contributions use the $4,400 limit; no remaining room or excess.

Six eligible self-only months and six family months, no catch-up or adjustments.

→ Monthly-method limit is $6,575 before any verified spouse or other required reductions; last-month rule is not applied.

$2,500 employee election, $100 approved incoming carryover, no employer funds, $2,200 eligible expenses and a permitted $680 outgoing carryover cap.

→ $400 illustrative outgoing carryover and $0 illustrative unused amount at risk, subject to plan rules.

$2,000 eligible direct employee contribution, 22% applicable federal rate and zero state/local rate.

→ $440 illustrative tax reduction and $1,560 net employee cost; no payroll-tax reduction.

Common Mistakes to Avoid

Applying the full family HSA limit independently to both spouses

Resolve the shared family allocation and each individual’s catch-up separately before using a personal annual limit.

Treating an FSA run-out deadline as more time to incur expenses

Confirm the distinction between the expense-incurrence window and the deadline to submit claims.

FAQ

No. Enter months only after confirming eligibility on the first day of each month. Other coverage, Medicare, dependent status and plan-specific rules matter. The 2026 rules include changes for some plans; a deductible number by itself is not sufficient.

The monthly worksheet does not apply it. Use a verified adjusted personal annual limit after reviewing the rule and its future eligibility testing period. Do not assume December eligibility alone removes the testing requirements.

No. Count employer-funded money and all employee and other counted contributions against the applicable personal limit. Salary reductions must appear only once. Spouses may need a shared family-limit allocation and separate individual catch-up contributions.

The planner flags the amount above the limit instead of silently replacing your input with a permitted amount. Resolve actual excess contributions with the custodian or adviser; this tool does not calculate corrections, earnings or tax penalties.

No. The FSA worksheet is for a health FSA plan year beginning in 2026. Dependent-care arrangements have separate rules. Verify the employer’s election cap, expense eligibility and unused-funds policy.

A general-purpose health FSA can affect HSA eligibility. Some limited-purpose or post-deductible arrangements differ. Verify the actual coverage before counting an HSA-eligible month; never reimburse the same expense twice.

No. It is a constant-rate illustration for an eligible employee-funded amount. It excludes bracket changes, credits, investment returns and FSA unused-fund losses. State treatment and payroll effects depend on the actual situation.

Each worksheet has its own explicit Save button and separate browser history. Copy Markdown Report includes entered values and results. Keep dated plan and tax worksheets separately and avoid entering personal identifiers.

About 2026 HSA and Health FSA Contribution Planner

Use separate worksheets for HSA contribution room, health FSA election and spending, and an eligible employee contribution’s illustrative tax effect. These accounts have different rules. Confirm eligibility and plan documents before using the examples; no limit, reimbursement or tax refund is guaranteed by entering numbers.