HSA last-month rule
Full-year limit
Can You Write Off HSA Last-month Rule?
Short answer: Be HSA-eligible on December 1 and you can contribute the full year's limit, but you must stay eligible all of next year or pay tax plus 10% on the extra.
2026 HSA limits are $4,400 self-only and $8,750 family (plus $1,000 at 55+); withdrawals for qualified medical costs are tax-free.
Records to keep: Keep receipts, statements (1098, 1098-T, 1099, W-2G), and a note of what each cost was for. Compare itemizing to the 2026 standard deduction before you claim.
HSA last-month rule
Typical range: Full-year limit
Individuals / Personal Taxes
Be HSA-eligible on December 1 and you can contribute the full year's limit, but you must stay eligible all of next year or pay tax plus 10% on the extra.
Business justification
Be HSA-eligible on December 1 and you can contribute the full year's limit, but you must stay eligible all of next year or pay tax plus 10% on the extra. 2026 HSA limits are $4,400 self-only and $8,750 family (plus $1,000 at 55+); withdrawals for qualified medical costs are tax-free.
Category
- Personal Tax Deductions