A designer buys a required software license, a technician drives to a temporary worksite, or an employee pays for approved travel. When the person does not receive repayment, the cost is unreimbursed. That description is simple; deciding who records it and whether it affects a tax return is more specific.
This guide provides general U.S.-focused education, not tax or legal advice. Rules change and exceptions can be narrow. Separate employee costs from self-employed business expenses, preserve evidence, follow the reimbursement process, and ask a qualified tax professional how current federal and state rules apply to your situation.
Key points
What to know at a glance
| Topic | What to check |
|---|---|
| Employee expenses and business expenses differ | Identify whether you were an employee or self-employed |
| Request reimbursement promptly | Use the designated expense form or system |
| Build a complete expense record | Itemized receipt or supplier invoice |
| Know when professional advice matters | Mixed employee and contractor status |
Employee expenses and business expenses differ
An employee pays expenses while working for an employer. A self-employed person pays costs while operating their own trade or business. The same purchase may be treated differently depending on who incurred it, why it was necessary, whether a reimbursement policy applied, and which tax rules cover the person.
The IRS explains that Form 2106 is used by employees in qualifying situations to deduct ordinary and necessary job expenses. It defines an ordinary expense as common and accepted in the field and a necessary expense as helpful and appropriate. Eligibility is not determined only by whether the cost felt work-related.
- Identify whether you were an employee or self-employed
- Record the business purpose at the time of purchase
- Check employer reimbursement rules before assuming a deduction
- Keep personal and business portions separate
Request reimbursement promptly
Employees should first use the employer’s written reimbursement process. Submit the receipt, date, amount, business purpose, project or client, and any required approval. If a deadline applies, do not wait until year-end. A rejected claim should retain the rejection and supporting correspondence.
Business owners should define a consistent policy for employees and owners. State which costs are allowed, who approves them, what evidence is required, and how quickly a claim must be submitted. Consistency makes bookkeeping clearer and reduces the chance that a personal cost is mixed into business records.
- Use the designated expense form or system
- Attach itemized receipts and proof of payment
- Explain the business purpose and participants
- Keep the approval or rejection with the record
Build a complete expense record
A bank or card statement proves that money moved, but it may not explain what was purchased or why. Keep the itemized receipt or invoice, proof of payment, date, vendor, amount, business purpose, and any allocation between business and personal use.
Photograph paper receipts before they fade and store them in a folder organized by year and category. Use stable filenames rather than leaving images in a camera roll. Reconcile the records with the relevant bank or card account regularly so missing documents are found while the purchase is still easy to remember.
- Itemized receipt or supplier invoice
- Proof of payment and transaction date
- Written business purpose
- Reimbursement request and outcome
Know when professional advice matters
Seek advice when the amount is significant, the cost has mixed personal use, the purchase creates a long-lived asset, the work crosses state or national borders, or employment status is uncertain. These facts can affect who reports the expense and when it is recognized.
Do not change an invoice to disguise an expense or create evidence after the fact. Keep accurate records and give the tax professional the original documents. A clear trail allows them to apply the correct current rule without reconstructing the transaction from memory.
- Mixed employee and contractor status
- Vehicle, home office, travel, or education costs
- Equipment or property used over multiple years
- Costs governed by more than one jurisdiction
Official sources
These references support the regulatory information in this guide. Check the current page before making a decision.
- IRS: About Form 2106, Employee Business ExpensesIdentifies Form 2106 and the limited categories of employees who may use it to claim qualifying business expenses.
- IRS: What kind of records should I keep?Lists supporting business records such as receipts, invoices, checks, and account statements used to substantiate expenses.
Frequently asked questions
Questions about what are unreimbursed business expenses?
Is every unreimbursed work expense tax-deductible?
No. Deductibility depends on current law, employment status, the type of expense, and individual facts. A work purpose alone does not guarantee a deduction.
Is a credit card statement enough evidence?
It may prove payment but often does not show the item or business purpose. Keep the itemized receipt or invoice and notes that explain the transaction.
What if my employer rejects reimbursement?
Keep the claim, evidence, policy, and rejection. Ask the employer to explain the reason, then consult a qualified professional before making any tax decision.