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The business math

Section 179 deduction

Section 179 expensing / Section 179 limit / Section 179 software

In short

The Section 179 deduction lets a business deduct the cost of qualifying equipment and off-the-shelf software in the year it is placed in service, instead of depreciating it over several years. For tax years beginning in 2025, the limit is $2,500,000, reduced once qualifying purchases pass $4,000,000.

It is an election, and three limits decide how much of a purchase it covers. The first is the dollar limit: $2,500,000 for tax years beginning in 2025, reduced by the amount that qualifying purchases placed in service that year exceed $4,000,000.

The second is the business income limit. The statute caps the deduction at taxable income derived from the active conduct of a trade or business during the year. Any cost that limit blocks can be carried to the next year.

The third is business use. Property used for both business and personal purposes qualifies only if business use is more than 50% in the year it is placed in service, and then only the business share of the cost counts.

Software is where the rule narrows. Off-the-shelf computer software qualifies, and the IRS defines it as software readily available for purchase by the general public, subject to a nonexclusive license, and not substantially modified. Software built to order for one business does not meet the first of those tests.

In practice

A contractor places in service a $60,000 excavator and a $9,000 accounting package sold under a standard license, and its business income for the year is $150,000. Both qualify, and the $69,000 total sits inside the income limit, so both can be deducted that year. A $40,000 scheduling system built only for the contractor is not off-the-shelf software and falls under other rules. The figures are a worked example.

Not the same as

De minimis safe harbor election
The de minimis election covers small items, up to $2,500 or $5,000 per invoice or item. Section 179 reaches much larger purchases, subject to its dollar, business income and business use limits.

Why it matters to you

The deduction can bring a large tax benefit into the year of purchase, but only for property that fits and only up to the year's business income. For software the deciding question is whether it is off the shelf. Check how a custom build will be treated with an accountant before counting on a first-year deduction.

What to ask or check

  1. 01Is this software readily available to the public under a nonexclusive license, or built only for this business?
  2. 02Was each item used more than 50% for business in the year it was placed in service?
  3. 03Does the year's business income cover the deduction, or will part of it carry forward?

What people get wrong

That any software a business pays for qualifies. Section 179 covers off-the-shelf computer software: readily available to the general public, under a nonexclusive license, and not substantially modified.

Keep reading

De minimis safe harbor election

The de minimis safe harbor election is an IRS rule for deducting small equipment purchases in the year they are paid for. It covers up to $2,500 per invoice or item, or $5,000 for a business with an applicable financial statement. The election is made on each year's return.

Estimated tax safe harbor

The estimated tax safe harbor is the IRS rule that protects a taxpayer from the underpayment penalty. Paying at least 90% of this year's tax or 100% of last year's, whichever is smaller, generally avoids it, with 110% of last year's tax once adjusted gross income passed $150,000.

Work made for hire

Work made for hire is the legal category that decides who owns something you paid to have made. Copyright starts with whoever created the work. For commissioned work it only becomes yours through one of two narrow routes in the statute, and software fits neither by default.

Margin

Margin is the difference between selling price and cost, stated either as a percentage of the selling price or per unit. The standards board that defines it also records that managers differ widely in the assumptions they use. So the number only means something once you know which costs are inside it.

Break-even point

The break-even point is where total cost and total revenue are equal, so there is no loss or gain. The SBA states it plainly and then states the limit plainly too: it is an estimate for lender viability and a business plan, not an accounting result, and the formula assumes a single product or service.

Cost per acquisition

Cost per acquisition is what you paid for each counted conversion, spend divided by conversions. Google expands the abbreviation as cost per action, not acquisition. It inherits whatever your conversion column counts, so two businesses can report the same figure and mean entirely different things.

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