Web and Software Developer Entity and Estimated Taxes: The Loan-Out S Corporation, the Product Company That Should Be a C Corporation, the Client in Twelve States, and the Quarterly on Retainer Income

A developer who sells services and a developer who builds a product face different structures. Services income usually belongs in an S corporation once profit runs well above a senior engineer's salary. A product that will take investment or be sold belongs in a C corporation, where the qualified small business stock exclusion can make a future sale largely tax-free — and the two should not share an entity. Around both sit clients in other states and other countries, and a quarterly plan built on retainers and milestones.

The services entity

| Stage | Structure | |---|---| | Freelancer netting under a senior engineer's salary | Single-member LLC, Schedule C; the S election's saving is small | | Freelancer or small shop netting well above that salary | LLC with the S election; salary benchmarked to employed senior developers in the market; distributions free of self-employment tax | | Shop with employed developers | S corporation; the team's W-2 wages support the qualified business income deduction at higher incomes |

The S election's saving is the self-employment tax on profit taken as distributions rather than salary — 15.3 percent on earnings up to the 2026 Social Security wage base of $184,500, but only the 2.9 percent Medicare rate (plus the 0.9 percent additional Medicare tax at higher incomes) above it, so the saving narrows as profit climbs past the base. Software development is not a specified service trade or business — it is not one of the listed fields, and consulting means advice and counsel, not building software — so the 20 percent qualified business income deduction is not phased out on that ground. Above 2026 taxable income of $201,750 ($403,500 joint), fully phased in at $276,750 ($553,500), the deduction is limited by the business's W-2 wages (or wages plus property), which is where the S corporation salary and a team's payroll help; a shop whose work really is consulting — advice without building — is a specified service business and loses the deduction above those ranges. A loan-out structure, where the corporation contracts for the developer's services, works when the corporation is genuinely the contracting party and employs the developer.

The product company

A product that will raise money from investors, grant equity to employees, or be sold to an acquirer is usually a C corporation: investors expect it, equity compensation works cleanly in it, and stock issued by a C corporation with no more than $75 million of gross assets at issuance ($50 million for stock issued on or before July 4, 2025) can qualify for the qualified small business stock exclusion — for stock acquired after July 4, 2025, 50 percent of the gain excluded after three years, 75 percent after four, and 100 percent after five, up to a per-issuer cap of the greater of $15 million (indexed after 2026) or 10 times the stock's basis ($10 million for earlier stock, which needs more than five years for any exclusion). Software product companies generally qualify; the excluded fields are services such as health, law, engineering, accounting, and consulting, and any business whose principal asset is the reputation or skill of its employees. The trade-off is the C corporation's own 21 percent tax on profits, which a growing product company usually reinvests, and losses in the early years that stay in the corporation rather than passing to the founder.

Keep them apart

Putting a product inside a services S corporation mixes a potential qualified small business stock asset with a business that cannot issue such stock, taints the product's history for investors, and exposes the product to the services business's liabilities. The clean design is two entities — the services LLC or S corporation, and the product C corporation — with the founder's time allocated and any shared costs charged across at arm's length. The product company can be formed when the product is ready for investment; before that, the services entity's domestic research costs are deductible under Section 174A for tax years beginning after 2024 (research performed abroad is still amortized over 15 years under Section 174), and the intellectual property can be contributed to the new corporation tax-free under Section 351 if the contributors — counting investors who buy stock in the same transaction — own at least 80 percent of it immediately afterward. The contribution should come from whichever entity owns the code (distributing it out of an S corporation first is taxable at its value), and the exclusion covers only growth after the contribution: the code's value on that date is not excluded.

Clients in twelve states

Florida has no personal income tax, and a Florida developer with clients across the country generally owes no other state's income tax on work performed in Florida — but there are exceptions: work performed on site in a client's state is generally taxable there, a growing number of states source service revenue to where the customer receives the benefit when apportioning a business's income, and some assert income tax nexus once a business's sales into the state pass an economic threshold, which varies by state. The federal law that shields sellers of tangible goods from state income tax, P.L. 86-272, does not cover services or software sold as a service. For a solo developer the practical exposure is small; for a shop with substantial revenue from one state, a nexus review is worthwhile. Employees working remotely in other states create payroll and nexus obligations there regardless.

Estimated taxes: retainers and milestones

Retainer income is steady and suits the prior-year safe harbor — four equal payments totaling 100 percent of last year's tax, or 110 percent if last year's adjusted gross income exceeded $150,000 ($75,000 married filing separately). Project income arrives at milestones — a large deposit, a payment at launch — and the annualized income installment method (Form 2210, Schedule AI) matches payments to the quarters the money lands. An S corporation developer can set salary withholding to cover the year's expected tax and skip quarterly estimates — withholding counts as paid evenly through the year, even when it is increased late in the year. The reserve rule is a fixed percentage of every receipt moved to a tax account before it is spent.

Foreign clients and foreign work

Income from a Canadian or other foreign client is U.S. business income, taxed the same, with no U.S. withholding or Form 1099; the client's country generally does not withhold on services performed in the United States, though some countries do on fees paid abroad, and a treaty can reduce or eliminate it — the developer should provide the forms the client requests. A developer who performs the work while present in the foreign country may create a tax obligation there.

Worked example. A developer nets $210,000 from client work inside an LLC and elects S status, taking a $130,000 salary benchmarked to senior engineers and distributing the balance — about $70,055 after the corporation's $9,945 share of payroll taxes. Payroll taxes on the salary total $19,890, against about $28,502 of self-employment tax on $210,000 as a sole proprietor ($184,500 at 12.4 percent plus $193,935 at 2.9 percent) — a saving of about $8,600 before payroll costs and income tax effects. She sets salary withholding to cover the year's tax. She has spent $40,000 of U.S. contractor, cloud, and tool costs building a product (her own time is not a cost), deducted under Section 174A through the services entity. When an investor offers funding, she forms a C corporation; the services entity, which paid for and owns the code, contributes the product's code and intellectual property under Section 351 alongside the investor's cash — together they own all of the new company — and the corporation issues stock that can qualify for the small business stock exclusion (its gross assets are far under $75 million), though only growth after the contribution is excluded. The services entity continues separately, billing clients in nine states from Florida.

Official sources

The statute provides: “For purposes of this subsection, the term “eligible gain” means any gain from the sale or exchange of qualified small business stock held for at least 3 years (more than 5 years in the case of stock acquired on or before the applicable date).” — Legal Information Institute, Cornell Law School, 26 U.S. Code § 1202 - Partial exclusion for gain from certain small business stock, https://www.law.cornell.edu/uscode/text/26/1202

The statute provides: “No gain or loss shall be recognized if property is transferred to a corporation by one or more persons solely in exchange for stock in such corporation and immediately after the exchange such person or persons are in control (as defined in section 368(c)) of the corporation.” — Legal Information Institute, Cornell Law School, 26 U.S. Code § 351 - Transfer to corporation controlled by transferor, https://www.law.cornell.edu/uscode/text/26/351

The IRS explains: “S corporations must pay reasonable compensation to a shareholder-employee in return for services that the employee provides to the corporation before non-wage distributions may be made to the shareholder-employee.” — Internal Revenue Service, S corporation compensation and medical insurance issues, https://www.irs.gov/businesses/small-businesses-self-employed/s-corporation-compensation-and-medical-insurance-issues

Related guides

• Web and Software Developer Deductions: The Hardware, the Subscriptions, the Offshore Contractor With No 1099, the Product You Build on Your Own Time, and the Client in Another State
• Qualified Small Business Stock After the 2025 Law
• When a C Corporation Beats an S Corporation
• Income Tax in Other States: Nexus and Apportionment
• Accounting & Tax for SaaS Companies, Fully Virtual

Next step

Fairlight Accounting handles U.S. domestic, cross-border (U.S.–Canada), and international tax returns, plus bookkeeping, payroll, and CFO advisory. Our U.S. Tax Desk structures the services entity and the product company separately and times the C corporation to the first investment. See pricing or book a free fit call.