Startup Entity Choice and Founder Taxes

Guide · Last reviewed October 10, 2026 · Legal and tax review: pending

The first tax decisions a startup makes are often the most expensive to change. The entity type, the way founders receive stock, and the timing of elections all shape later rounds, exits and the tax on founder gains.

C corporation or LLC

Question	C corporation	LLC taxed as a partnership
Tax on profit	Taxed at the company level; dividends taxed again to owners	Passes through to members; members taxed on their share
Venture investors	Standard for institutional venture capital	Often harder for funds to invest in, and can create tax reporting for investors
Founder stock	Common stock can qualify for QSBS treatment if the rules are met	Membership interests generally do not qualify for QSBS
Employee equity	Incentive stock options available	Profits interests are used instead of options
Losses	Losses stay in the company	Losses may pass through to members, subject to limits

Common patternMany venture-backed startups are C corporations, often formed in Delaware, because investors and option plans expect that structure. The right choice depends on your funding plan, your exit plan and your state.

The 83(b) election

When founders receive stock that vests over time, the stock is generally taxed as it vests, based on its value at that time. A Section 83(b) election allows you to be taxed when the stock is granted instead. The election must be filed with the IRS within 30 days of the grant. It cannot be fixed after the deadline. For early-stage stock with low value, filing on time can be very valuable, because future appreciation may be taxed as capital gain rather than as ordinary income on vesting.

DeadlineThe 83(b) election has a strict 30-day deadline from the grant date, not from vesting. Missing it cannot be corrected later. Calendar the date when the stock is granted.

Founder checklist

Choose the entity with your investors and exit plan in mind.
File 83(b) elections within 30 days for restricted stock grants.
Set up a stock ledger and keep records of the grant date, price and vesting schedule.
Track the company's gross assets and the dates stock is issued, since QSBS tests depend on them.
Plan the state income tax and franchise tax obligations of the entity.

Mistakes to avoid

Missing the 83(b) deadline, or filing it after the grant date rather than within 30 days.
Forming an LLC when venture funding is expected, which often requires conversion later with its own tax effects.
Issuing founder stock at a price that does not reflect fair market value without considering the tax consequences.

General educational information. Entity choice, 83(b) elections and founder taxation depend on the facts, the state and the terms of your documents. Consult a qualified CPA and attorney before forming an entity or filing an election.