Startup tax planning from formation to exit

Startups face tax decisions early, often before there is revenue: how to form the company, how founders receive stock, how research spending is deducted, and whether investors and founders can exclude gains on qualified small business stock. This site covers those decisions and the mistakes that are hardest to fix later.

Start with founder taxes

The decisions that matter most

Entity and founder stock

C corporation or pass-through, and the 83(b) election that must be filed within 30 days of a restricted stock grant.

Read the guide →

R&D expensing

Domestic research costs can be deducted currently under Section 174A, which changed the rules for many startups.

Read the guide →

QSBS

Section 1202 can exclude a large part of gain on qualifying stock. The rules changed for stock acquired after July 4, 2025.

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Common startup questions

  • Should we form a C corporation or an LLC?
  • Did we file the 83(b) election on time?
  • Can our research costs be deducted this year?
  • Does our stock qualify as QSBS, and what must we keep track of?
  • What are the tax consequences of incentive stock options and RSUs?
  • Are our contractors classified correctly, and is payroll set up right?

Answers are in our FAQ, with deadlines and current news.

Questions founders wish they had asked sooner

Short answers to the startup tax questions that are hardest to fix later. Tap a card to read the full answer.

Q 01

Can a founder owe tax on stock they have never sold?

Yes. If shares are subject to vesting and no 83(b) election is made, tax is generally due as the shares vest, based on their value at that time minus what you paid. That can be a large bill on an illiquid asset.

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Q 02

Why can an 83(b) election cost almost nothing at the start?

If you pay the full value for the shares at grant, there is generally no income to report, and future growth is taxed as capital gain. The risk is that if you forfeit the shares you generally cannot claim a loss for the amount you paid.

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Q 03

What does the word qualified mean in QSBS?

Generally a domestic C corporation, stock acquired at original issuance, an asset test at issuance, and an active business that is not in an excluded field, such as health, law, financial services, hospitality or farming.

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Q 04

Can an LLC taxed as a partnership issue QSBS?

No. QSBS must be stock of a C corporation. An LLC that has elected to be taxed as a C corporation can qualify, and the date of the election matters.

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Q 05

Why do investors prefer a Delaware C corporation?

Venture funds generally want preferred stock, a familiar legal framework and a structure that does not pass taxable income through to the fund. A C corporation also supports QSBS.

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Q 06

Can startup losses be used later?

Net operating losses from recent years generally carry forward indefinitely, but can offset only 80% of taxable income in a later year. An ownership change can limit how much of the loss can be used.

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Q 07

Can a pre-revenue startup use research credits against payroll tax?

Qualifying small startups may be able to apply up to $500,000 a year of the research credit against payroll taxes instead of income tax. It requires meeting gross receipts and age tests, so check eligibility before the first payroll.

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Q 08

How is a SAFE taxed?

The tax treatment of a SAFE is not fully settled, so the way the company and the investor report it should be reviewed with a CPA. Consistent treatment between the parties matters.

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Q 09

What happens to ISOs when an employee leaves?

To keep ISO treatment the options generally must be exercised within three months after employment ends. After that they are treated as non-qualified options.

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Q 10

Can you roll over QSBS gain into new QSBS?

Possibly. Section 1045 can allow deferral of gain from selling QSBS held for more than six months if the proceeds are reinvested in other QSBS within 60 days. The rules are specific, so plan before you sell.

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Q 11

Are startup costs deductible before the business opens?

A limited amount, up to $5,000, can be deducted in the first year, reduced when total startup costs pass $50,000. The remainder is generally amortized over 180 months starting when the business begins.

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Q 12

Do foreign founders face special filing rules?

Yes. Nonresident aliens cannot own S corporation stock, and a U.S. corporation that is 25% or more foreign-owned generally must file Form 5472 each year, with a significant penalty for failing to file.

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Q 13

Why can a Delaware company still owe tax in other states?

Delaware is where the company is formed, but states tax businesses that operate or have employees there. A company can owe Delaware franchise tax and income or franchise tax where it has nexus.

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Q 14

Do founders have to be on payroll?

A founder who works for the corporation as an employee generally must be paid reasonable wages, and wages bring payroll tax. Unpaid work for stock has its own tax issues, so decide how founders are compensated before the first paycheck.

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Did you know?

The 83(b) deadline is 30 days from the grant date. It is not extended by a holiday or by a later vesting event.

Source: IRS Publication 525

Section 174A restored a current deduction for domestic research costs for tax years beginning after 2024, but foreign research costs are still amortized over 15 years.

Source: IRS: Research and experimental expenditures

QSBS status depends on when stock is issued, so a company's gross asset figure on the issue date is a key record to keep.

Source: IRS Publication 550

Form 941 is the quarterly federal payroll return that most employers with W-2 employees must file, and equity withholding usually flows through payroll.

Source: IRS: About Form 941

For stock issued after July 4, 2025, QSBS offers a tiered exclusion of 50% at three years, 75% at four years and 100% at five years.

Source: IRS Publication 550

The gross asset limit for QSBS was $50 million and is $75 million for stock issued after July 4, 2025.

Source: IRS Publication 550

The IRS publishes Form 15620 for 83(b) elections, and the election must still be made within 30 days of the grant.

Source: IRS Publication 525

A U.S. corporation that is 25% or more foreign-owned generally must file Form 5472 every year, and the penalty for failing to file is $25,000 per form.

Source: IRS: About Form 5472

Net operating losses from tax years after 2017 can be carried forward indefinitely but are limited to 80% of taxable income in the year used.

Source: IRS Publication 536

Delaware corporations file an annual report and pay franchise tax, and the report is due March 1.

Source: Delaware Division of Corporations

Qualified small startups can use up to $500,000 of the research credit against payroll tax each year.

Source: IRS: Research credit

The first $5,000 of startup costs can generally be deducted in the first year, and the rest is amortized over 180 months.

Source: IRS: Business expense resources

From our network

Related readingFor the business structure decision in more depth, see choosing a business structure on BusinessTaxSaver. For founders who also invest in property, see RealEstateTaxSaverCPA.