Key takeaways
- A write-off reduces taxable income. Your saving is the expense multiplied by your tax rates, not the full amount.
- To qualify, a business expense must be ordinary and necessary for your trade, and you must be able to prove it (IRS Publication 334).
- Equipment can often be written off in the year you buy it. The 2026 Section 179 limit is $2,560,000.
- Without a receipt or other record, a write-off may not survive an audit.
What is a write-off?
“Write it off” is how most people say “deduct it as a business expense.” The tax code doesn’t use the term, but the idea is the same: you subtract a legitimate business cost from your income so you pay tax on a smaller amount.
In accounting, “write-off” has a second meaning: removing an asset that’s lost its value, such as an unpaid invoice you’ll never collect (a bad debt) or damaged inventory. This page focuses on the everyday tax meaning.
Snap every write-off receipt before it fades with the Manage Receipt app.
How write-offs work: an example
Alex, a self-employed video editor in the 22% federal income tax bracket, buys a $1,000 monitor used only for work and deducts it this year.
- Income tax saved: $1,000 × 22% = $220.00
- Self-employment tax saved: $1,000 × 92.35% × 15.3% = $141.30
- Total federal tax saved: $220.00 + $141.30 = $361.30
- Real cost of the monitor: $1,000 − $361.30 = $638.70
The write-off cut the price by about a third. It didn’t make the monitor free. State income tax, if any, would add a little more saving. The exact figure also depends on the QBI deduction and your other income, so treat this as an estimate.
The lesson: a write-off makes a purchase you need cheaper. It’s a poor reason to buy something you don’t need.
Common small business write-offs
Software subscriptions, computers, phones and equipment used for the business.
Office or coworking rent, or the home office deduction if you qualify.
Business mileage or vehicle costs, parking, tolls and travel away from home.
Advertising, website costs, business cards, platform and payment fees.
Accountants, lawyers, contractors and business insurance.
Business meals (usually 50%), courses and books that maintain your current skills.
Larger items such as equipment and vehicles are capital assets. Normally they’re written off over several years through depreciation, but Section 179 expensing and bonus depreciation often let small businesses deduct the full cost in year one. The 2025 tax law restored 100% bonus depreciation for qualifying property acquired after January 19, 2025.
Write-off myths
| Myth | Fact |
|---|---|
| “It’s a write-off, so it’s free.” | You save only your tax rate on it, about 36% in the example above, not 100%. |
| “Anything bought through the business is a write-off.” | It must be ordinary and necessary for the business. Personal costs stay personal, whoever pays. |
| “The bank statement is enough proof.” | A statement shows you paid, not what you bought or why. Keep the receipt. |
| “A write-off cuts my tax bill dollar for dollar.” | That’s a tax credit. A deduction only reduces the income the tax is figured on. |
| “My car, phone and meals are fully deductible.” | Only the business-use share counts, and most meals are limited to 50%. |
| “Employees can write off work costs too.” | Most W-2 employees can’t deduct unreimbursed job expenses on their federal return. |
Some costs can never be written off, such as traffic fines, commuting and political contributions. See non-deductible expense for the full list.
Records needed
- The receipt or invoice showing vendor, date, items and amount
- Proof of payment, such as a card or bank statement
- The business purpose, especially for meals, travel and gifts
- Business-use percentage for mixed items like a phone or car
- Purchase date and cost for assets you depreciate or expense
The IRS calls this substantiation: if you can’t show it, you can’t deduct it. Records should be kept at least three years after you file, and longer for assets.
Every write-off with its receipt attached
A write-off is only as strong as the receipt behind it. Manage Receipt scans each purchase, pulls out the vendor, date, items and total, and lets you add the business purpose on the spot. The AI tax report then groups your write-offs by category, each one linked to its proof.
Explore AI Tax ReportsFrequently asked questions
Does a write-off mean it’s free?
No. A write-off lowers your taxable income, so you save only your tax rate on the expense. A self-employed person in the 22% bracket saves roughly 36 cents per dollar after income and self-employment tax. The other 64 cents still comes out of your pocket.
Write-off vs deduction?
They mean the same thing in everyday tax talk. “Write-off” is the informal word; “deduction” is the IRS term for an amount subtracted from income. Both differ from a tax credit, which reduces your tax bill dollar for dollar. A $100 deduction saves your tax rate on $100; a $100 credit saves the full $100.
Can I write off something I bought before starting my business?
Possibly. Costs to start a business, such as market research or advertising before opening, are startup costs. You can generally deduct up to $5,000 in the first year, with the rest spread over 15 years. Personal items later used in the business follow separate rules.
How much can I write off?
There’s no fixed limit on ordinary and necessary business expenses, but each must be real, business-related and documented. Some categories have caps: most meals are 50% deductible, business gifts are limited to $25 per recipient per year, and the home office simplified method is capped at $1,500.
Can I write off a purchase if I lost the receipt?
Possibly, but it’s harder. Rebuild the record with a card statement, an order history or a vendor copy, plus a note on the business purpose. For travel and gifts, lodging always needs a receipt and other costs of $75 or more usually do. Scanning receipts right away avoids the problem.