S Corp Start-Up Costs: $5,000 Deduction and 180-Month Amortization

An S corporation can deduct up to $5,000 of start-up costs and a separate $5,000 of organizational costs in the tax year it begins active business, then amortize anything left over in equal monthly installments across 180 months. Both immediate deductions phase out dollar-for-dollar once costs in that category exceed $50,000, and both disappear entirely at $55,000. The S corp start-up costs deduction is automatic: you do not have to attach an election statement, but you do have to sort your pre-opening expenses into the right buckets and pin down the date your business actually started.

Start-Up Costs vs. Organizational Costs

The two categories have separate $5,000 limits, so lumping them together can quietly cost you part of your first-year write-off.

Start-up costs are what you spend investigating whether to create or buy a business, plus what you spend after deciding to go forward but before operations begin. The test is whether the expense would have been an ordinary, deductible business expense if the business had already been running.¹ Typical examples: market research, scouting trips to evaluate locations, pre-opening advertising, and wages paid to employees in training before you open.

Organizational costs are narrower. They cover only expenses tied directly to creating the corporate entity itself. To qualify, the cost must be connected to forming the corporation, chargeable to a capital account, and of a type that would be amortizable if the corporation had a limited lifespan.² Think state filing fees for articles of incorporation, attorney fees for drafting bylaws and the charter, and accounting fees for setting up the initial books.

Costs That Don’t Qualify

Some pre-opening expenses are carved out of this treatment entirely. The biggest trap for new S corporations is stock issuance costs. Fees for printing stock certificates, legal work on stock-purchase agreements, and commissions on selling ownership interests cannot be deducted or amortized. They must be permanently capitalized, typically by reducing the proceeds from the stock transaction.³

Interest, taxes, and research and experimental costs are also carved out, because each has its own deduction rules elsewhere in the code. You deduct those under their own sections rather than running them through the start-up cost rules.¹

How the $5,000 Immediate Deduction Works

In the tax year the S corporation begins business, you can deduct up to $5,000 of start-up costs and up to $5,000 of organizational costs, for a combined potential first-year write-off of $10,000.¹²

Each category has its own phase-out. If total start-up costs exceed $50,000, the $5,000 immediate deduction shrinks dollar-for-dollar by the overage. At $55,000, the immediate deduction is gone and everything gets amortized. The identical phase-out runs on a separate track for organizational costs.¹²

Because the two phase-outs are independent, heavy spending in one category does not shrink the other. An S corporation with $60,000 in start-up costs but only $4,000 in organizational costs gets no immediate deduction for start-up (fully phased out) but still deducts the entire $4,000 of organizational costs in Year 1.

Amortizing the Rest Over 180 Months

Whatever you cannot deduct immediately is capitalized and written off in equal monthly installments over 180 months, which is 15 years. Amortization starts in the month your active trade or business begins.¹

Divide the remaining balance by 180 to get the monthly deduction. Say your S corporation has $53,000 in start-up costs. The phase-out trims the immediate deduction to $2,000 ($5,000 minus the $3,000 overage above $50,000). The remaining $51,000 amortizes at $283.33 per month.

The First-Year Calculation

This is where new S corporation owners most often leave money behind. In the first year, you claim the immediate deduction plus amortization for the months remaining in that year, not just one or the other. If the business begins October 1, the $53,000 example above produces three months of amortization (October through December) on top of the $2,000 immediate deduction: $2,000 + ($283.33 × 3) = $2,850 for the year.⁴

The same math runs separately on the organizational cost side. With $8,000 in organizational costs and the same October 1 start date, you deduct $5,000 immediately, amortize the remaining $3,000 at $16.67 per month, and claim $5,000 + ($16.67 × 3) = $5,050 for the first year.

When Your Business Actually Begins

The start date controls which expenses are start-up costs, when amortization begins, and when ordinary deductions take over. Get it wrong and you may capitalize expenses that should have been fully deductible, or deduct costs that should have been amortized.

Filing articles of incorporation or getting an EIN does not count. A business begins when it starts performing the activities it was organized to do. For a retail store, that is the day you open to customers. For a consulting firm, it is when you start serving clients. For a manufacturer, it is when the production line begins regular output. Costs before that date go into the start-up or organizational buckets. Costs on or after it are ordinary deductions, fully deductible in the year paid or incurred.

Claiming the Deduction: Election and Forms

The election is automatic. Your S corporation is deemed to have elected to deduct and amortize both start-up and organizational costs unless it affirmatively chooses to capitalize them instead.⁵⁶ No separate election statement is required.

If instead you want to capitalize everything, you must affirmatively elect to do so on a timely filed return (including extensions) for the year the business begins. That election is irrevocable and applies to all start-up or organizational costs of the business.⁶

Report the amortization in Part VI of Form 4562, Depreciation and Amortization. For each category, list a description, the date amortization begins, the total amortizable amount, the applicable code section (Section 195 for start-up costs, Section 248 for organizational costs), and the deduction for the year.⁴ The total, including both the immediate write-off and the amortization, flows to Line 20 of Form 1120-S.⁷

How the Deduction Reaches Shareholders

An S corporation does not pay federal income tax itself. The start-up and organizational cost deductions reduce the corporation’s ordinary income (or increase its ordinary loss), which passes through to shareholders on Schedule K-1 and lowers their individual taxable income for the year.⁸

Those deductions also reduce each shareholder’s stock basis, which caps the losses a shareholder can actually deduct in a given year. In the early years, when amortization often stacks on top of operating losses, it is worth running a basis calculation before assuming the full pass-through loss is usable.

If the Business Is Sold or Never Launches

If the S corporation completely disposes of the business before the 180-month period ends, any unamortized start-up costs still on the books can be written off as a loss in the year of disposition.¹ You do not lose the tax benefit just because the business did not survive the full 15 years.

A harsher rule applies when the business never launches at all. The start-up expenditure statute only applies to a business that actually begins, so investigatory costs for a venture the corporation abandons before opening do not become Section 195 start-up costs. For a corporation, those abandoned costs are generally deductible as a business loss. The rules are less forgiving for individuals investigating their first business without having identified a specific venture, so operating through the S corporation offers some protection on this front.

1
Office of the Law Revision Counsel. 26 U.S. Code 195 – Start-up Expenditures
2
Office of the Law Revision Counsel. 26 USC 248 – Organizational Expenditures
3
Internal Revenue Service. AM-2020-003 – Stock Issuance Costs
4
Internal Revenue Service. Instructions for Form 4562 (2025)
5
GovInfo. 26 CFR 1.248-1 – Election to Amortize Organizational Expenditures
6
eCFR. 26 CFR 1.195-1 – Election to Amortize Start-up Expenditures
7
Internal Revenue Service. Instructions for Form 1120-S (2025)
8
Internal Revenue Service. S Corporation Stock and Debt Basis