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The basics
A Health Savings Account has its own contribution limits and withdrawal treatment. On the account card, choose self-only or family coverage and enter any employer funding.
The model builds a qualified-medical-cost pool from the costs it knows. HSA withdrawals within that pool can be tax-free; amounts beyond it follow the account’s taxable-withdrawal rules.
Illustrative numbers
Match the withdrawal to the medical pool
Remaining qualified modeled costs$6,000
HSA withdrawal$8,000
Potential tax-free portion$6,000
Portion outside that pool$2,000
The remaining $2,000 is ordinary income in the model, with an additional 20% charge before age 65. At 65 or later, that extra charge stops; the ordinary-income treatment remains.
Calculation transparency
How it works in MoneyWhatIf
- 01
Employer funding uses the coverage contribution limit alongside household contributions. Family coverage is shared across the household; eligible catch-up contributions remain owner-specific.
- 02
The model stops new HSA contributions at its Medicare eligibility age of 65. It does not determine actual high-deductible-plan eligibility month by month.
- 03
The qualified pool includes modeled Medicare and IRMAA costs, declared medical spending, and eligible long-term-care costs, reduced to avoid also reimbursing costs already deducted on Schedule A.
- 04
Marketplace premiums are outside this pool. General spending is not classified as qualified medical spending merely because an HSA is available.
Keep in mind
Model limits
The app does not keep receipts, track reimbursements for historical medical expenses, or verify that an expense qualifies.
The model simplifies eligibility and tax treatment; it does not represent every state-specific HSA exception or enrollment circumstance.
This explanation documents the planning model. It is educational, not individualized tax, legal, Medicare, or investment advice.
Where it appears
Where to use it
See this concept in context, with a guide to each page and its controls.
The words behind it
Related financial terms
Plain-English definitions, with 2026 figures and worked examples, from the financial terms glossary.