Section 179 Carryover: Rules for Unused Deduction Amounts
Key Takeaways
- Section 179 deduction is limited to your taxable business income for the year
- Unused Section 179 deduction carries forward indefinitely — it is never lost
- Particularly valuable for startups that invest heavily before generating significant revenue
- The carryover amount becomes available when the business has sufficient income
- Regular MACRS depreciation can be used for amounts not covered by Section 179
The Business Income Limitation
Section 179 cannot create or increase a net operating loss. If your business has not generated enough profit yet — common for startups — you cannot deduct more than your taxable business income using Section 179. But the unused amount is not lost; it carries forward to future years.
How the Carryover Works
Suppose your startup buys $200,000 in servers and equipment but only has $50,000 in taxable business income. You can deduct $50,000 under Section 179 this year, and the remaining $150,000 carries forward. Next year, if your business earns $300,000, you can deduct the carried-over $150,000 then.
The carryover has no expiration date — it continues forward indefinitely until you have sufficient business income to absorb it.
Strategy for Startups
For startups and growing businesses, the carryover rule is a valuable safety net. You do not need to worry about losing Section 179 benefits just because your business is not yet profitable. Plan your equipment purchases knowing that the tax benefit will come when your revenue catches up.
However, you can also use regular MACRS depreciation on the portion you cannot expense under Section 179. A tax professional can help determine the optimal strategy based on your projected income trajectory.
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