# What is R&D Tax Credit? Definition & Technical Mechanics

> **Source:** [SPIDITS AI Startup & Venture Intelligence Glossary](https://spidits.com/startup-glossary)  
> **Category:** Finance & Legal  
> **Canonical Citation:** [https://spidits.com/startup-glossary/rd-tax-credit](https://spidits.com/startup-glossary/rd-tax-credit)

## Definition
The R&D Tax Credit (Section 41) is a federal and state tax incentive allowing software startups and tech companies to offset payroll taxes and income tax liabilities using qualified research expenses.

## Architectural Mechanics & Deep Dive
The R&D Tax Credit (Section 41) is a federal and state tax incentive allowing software startups and tech companies to offset payroll taxes and income tax liabilities using qualified research expenses.

## Industry Applications & Real-World Use Cases
Offsetting software engineering payroll tax and cloud compute expenses

## Frequently Asked Questions

### What software engineering costs qualify for the R&D tax credit?
Qualifying costs include software developer salaries, US-based contractor fees, and cloud computing infrastructure costs dedicated to software development.

### Can pre-revenue startups claim the R&D tax credit?
Yes, eligible early-stage startups with under $5M in gross receipts can apply up to $500,000 annually against their FICA payroll tax liability.

## Related Terminology
- [qsbs](https://spidits.com/startup-glossary/qsbs)
- [section-83b-election](https://spidits.com/startup-glossary/section-83b-election)
- [409a-valuation](https://spidits.com/startup-glossary/409a-valuation)

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*From the SPIDITS AI Knowledge Base (311+ terms indexed). Explore full technical definitions: [https://spidits.com/startup-glossary](https://spidits.com/startup-glossary)*