ISOs vs NSOs: Structuring Option Grants
Written by Aparna Devalla
Curated by Rubric Financial
1 / 4
What ISOs and NSOs Are
- Incentive Stock Options (ISOs) are tax-advantaged options available only to employees, receiving favorable capital gains treatment if holding period requirements are met
- Non-Qualified Stock Options (NSOs) can be granted to anyone (employees, contractors, advisors, board members) but the spread at exercise is taxed as ordinary income
- Both give the holder the right to purchase company stock at a fixed exercise price (the 409A fair market value at grant date)
- The choice between ISOs and NSOs affects both the company's payroll tax obligations and the recipient's individual tax treatment
Related Resources
The Income Tax Provision Under ASC 740
An overview of the ASC 740 income tax provision, covering deferred tax assets and liabilities, valuation allowances, and why unprofitable startups still record a provision.
Tax & ComplianceQualified Small Business Stock (QSBS)
How Section 1202 allows startup shareholders to exclude millions in capital gains from federal tax, how the 2025 OBBBA changed the rules, and what your company must do to qualify.
Tax & ComplianceSection 754 Election: Step-Up Basis for Partnerships (and Why S-Corps Can't)
The §754 election is the mechanism that lets partnerships and LLCs step up the inside basis of their assets when a partner dies, transfers their interest, or takes a distribution. S-corps have no equivalent, a real cost founders often discover too late.
About the author
Aparna DevallaCPAHead of Tax & Accounting
CPA and Head of Tax & Accounting at StartupCFO. Specializes in multi-state tax compliance, R&D credits, and GAAP-compliant books for venture-backed startups.
More articles by Aparna →Related tools and reading
SAFE Conversion Calculator
Model stacked post-money SAFE conversion and the option pool shuffle.
GuideValuation and Dilution: Raising Capital guide
How early valuations get set, how dilution stacks up round after round, and the option pool trap.
InsightAustin Startup Tax Deadlines 2027: Texas Franchise Tax Calendar
Texas has no personal or corporate income tax, but Austin startup taxes are not zero. Here is the 2027 calendar for founders: the May franchise tax report, the Public Information Report, sales tax on SaaS, the new refundable R&D credit, Travis County property renditions, and the federal and Delaware dates layered on top.
Glossary409A Valuation
Independent valuation of common stock used to set option strike prices.
Free tool409A Calculator
A rough planning range for common stock value from your last preferred price.
InsightBoston Startup Tax Deadlines 2027: Massachusetts Calendar
Boston startup taxes run mostly through the state: the Massachusetts corporate excise with its $456 minimum, sales tax on SaaS, PFML contributions, and the 4% millionaire surtax that hits founders at exit. Here is the full 2027 calendar for a Delaware C-corp in Massachusetts.
Want a CPA to own this?
Deadlines tracked, estimates filed, and multi-state compliance handled across all 50 states, with expert sign-off.
No spam, ever. If the download doesn't start, email us.
Or talk it through:
