HSA basics
A Health Savings Account is a tax-favored medical savings account available to individuals enrolled in a high-deductible health plan (HDHP). HSA contributions are deductible above the line (they reduce AGI), grow tax-free, and are withdrawn tax-free for qualified medical expenses. After age 65 they can be withdrawn for any reason at ordinary income rates — like a traditional IRA but with the bonus medical-tax-free option.
Triple tax benefit
The HSA is the only account in the Code with a triple tax benefit: deductible contributions, tax-free growth, and tax-free qualified withdrawals. Self-employed taxpayers covered by an HDHP should fund the HSA before any other tax-advantaged account because the long-run benefits are unmatched.
Contribution limits
Limits are set annually and are higher for family HDHP coverage than self-only. A $1,000 catch-up contribution applies at age 55. The "last-month rule" lets a taxpayer eligible on December 1 contribute the full annual amount, subject to a 12-month testing period — fail the test and the additional contribution becomes taxable plus a 10% penalty.
Reporting
Part I reports contributions (yours and your employer's, with employer amounts excluded from Box 1 wages and shown in Box 12 Code W). Part II reports distributions, separating qualified medical from non-qualified. Part III computes any additional 20% tax or income inclusion for non-qualified distributions before age 65.
Coordination with the self-employed health insurance deduction
HSA contributions and the self-employed health insurance deduction are independent and stack. A self-employed individual with an HDHP can deduct premiums on Schedule 1 line 17 and HSA contributions on Schedule 1 line 13.
Software vs. paper filing
Most filers use commercial tax software or a tax preparer to handle Form 8889, Health Savings Accounts (HSAs) — and that is the right call for nearly all small-business returns. The IRS Free File program is open to taxpayers below an annually adjusted income limit and supports most small-business forms. Direct paper filing is technically still an option but is slower, more error-prone, and increasingly relegated to corner-case situations. Whichever path you choose, retain a digital PDF of the as-filed return for at least three years (six if you under-reported income by more than 25%).