Quick answer: A properly designed Section 105 accident-and-health reimbursement plan is a lawful tax provision, not abusive avoidance merely because qualifying reimbursements can be excluded from employee wages and deducted by the employer. Problems arise when a plan reimburses personal costs without substantiation, favors owners unlawfully, or fails other federal health-plan rules.
This guide translates the controlling rule into filing and recordkeeping steps. It reflects official material available on August 17, 2026. Tax-year forms, software features, state rules and agency procedures can change, so use the instructions for the exact year and transaction involved.
At a glance
| Question | Practical answer |
|---|---|
| Who this applies to | Employers reimbursing employees for qualifying medical expenses |
| What this does not cover | A blanket deduction for an owner's family expenses or unsubstantiated cash allowances |
| Where it is handled | Employer plan documents, claim records, wage reporting and the business tax return |
How the rule works
Start by identifying the legal character of the payment, account, credit, deduction, benefit or loan. A marketing label does not control the tax result. Dates, ownership, business purpose, filing status, income limits, residency and documentation can turn a superficially similar situation into a different answer.
- The arrangement should be an employer plan with written terms, eligible participants and defined reimbursable expenses.
- Reimbursements must relate to qualifying medical care and should be substantiated before payment.
- Unused allowances should not be converted automatically to cash or other taxable benefits.
- Self-insured medical reimbursement plans must consider Section 105(h) nondiscrimination rules for highly compensated employees.
- S corporation shareholders, partners and sole proprietors do not always receive the same employee exclusion as common-law employees.
Practical example
A corporation adopts a written plan for eligible employees, verifies a $1,200 dental bill, and reimburses the employee only after receiving documentation. That is materially different from paying an owner a flat $10,000 'medical allowance' with no claims, receipts or eligibility standards.
This example isolates the principal rule. It is not a complete return calculation: phaseouts, other credits, state conformity, related-party rules, passive-loss limits and prior-year carryovers may change the outcome.
Step-by-step checklist
- Identify the employing entity and eligible employee class.
- Adopt plan documents before reimbursements are made.
- Define substantiation and privacy procedures.
- Test owner status and nondiscrimination.
- Coordinate the plan with ACA, HRA and wage-reporting requirements.
Reconcile the result to the actual return, notice, lender disclosure or benefit statement before signing. Preserve the source documents, calculations and proof of submission; a software interview or account screen is not a substitute for evidence.
Records to keep
Keep the filed forms and schedules together with receipts, statements, contracts, account records and correspondence that establish amount, date, ownership and purpose. For an asset, credit or carryforward that affects later years, retain the origin-year worksheet through the final disposition or use year and the applicable limitation period.
Common mistakes to avoid
- Creating the plan after expenses are paid.
- Reimbursing estimates instead of substantiated claims.
- Assuming every business owner is treated as an employee for exclusion purposes.
Correct an issuer or agency error through the documented correction process rather than silently changing a reported amount. When the dollars are material, a notice deadline is close, or the facts involve more than one jurisdiction, obtain advice from a credentialed professional who can review the complete record.
Related NavajoTax guides
Continue with business tax planning, employee benefit compliance records. These related pages explain connected rules, but the current official form or agency instruction controls the transaction you actually report.
Frequently asked questions
Can a one-person business use Section 105?
Entity type and the existence of a bona fide employee relationship are critical; spouse-employee arrangements require real services, reasonable compensation and documentation.
Are reimbursements reported on Form W-2?
Properly excludable accident-and-health benefits generally are not taxable wages, but owner and discriminatory-plan rules can change treatment.
Is a Section 105 plan the same as an HSA?
No. They have different funding, eligibility, ownership and reimbursement rules.
Sources reviewed
Last reviewed: August 17, 2026. This article provides general educational information, not individualized tax, legal, investment, lending or benefits advice.