R and D Tax Credit Guide

R and D Tax Credit Guide: 9 Things US Startups Should Know

What the R and D Credit Actually Is
Why Pre-Revenue Startups Can Still Benefit
How to Document a Claim
9 Things to Know About the R and D Tax Credit
Case Study: The Payroll Offset That Funded Two Hires
Frequently Asked Questions

Introduction

An R and D tax credit guide is worth reading even if you think you do not qualify, because the definition is considerably broader than most founders assume.

The credit does not require laboratories or patents. It requires technical uncertainty and a systematic process of resolving it, which describes most software development.

This guide covers who qualifies, how the payroll offset lets pre-revenue companies benefit, what documentation is needed, and the nine things that matter most.

1. What the R and D Credit Actually Is

A federal credit against tax liability for qualified research expenses. Most states offer their own credit on top, with separate rules and separate claims.

Qualifying activity must meet a four-part test: a permitted purpose, technological in nature, elimination of uncertainty, and a process of experimentation. Software development frequently meets all four.

Expense type	Qualifies?	Notes
US-based engineering salaries	Yes	Usually the largest component
Contractor development work	Partially	Typically 65% of cost
Cloud compute for development	Yes	If used in the research process
Supplies used in research	Yes	Must be consumed
Work performed outside the US	No	Excluded entirely
Routine maintenance and bug fixes	No	No technical uncertainty

2. Why Pre-Revenue Startups Can Still Benefit

A credit against income tax is useless to a company with no taxable income. The payroll tax offset solves this, allowing qualifying small businesses to apply the credit against employer payroll taxes instead.

That turns the credit into cash for a pre-revenue company, which is why it matters disproportionately to early-stage startups.

Eligibility has conditions around gross receipts and company age. The IRS research credit guidance sets out the qualification tests in detail.

Payroll offset converts the credit to cash for pre-revenue companies
Gross receipts and age conditions apply to the payroll election
State credits run separately and some are refundable
The election is made on a timely filed return, so late filing can forfeit it

3. How to Document a Claim

Contemporaneous records beat reconstruction every time, and the standard is higher than for ordinary startup tax deductions. The credit is examined regularly and claims supported by project documentation created at the time hold up far better than those assembled afterwards.

Startup tax deductions generally need receipts. This needs something more: evidence of what technical uncertainty existed and how it was systematically addressed.

Project-level time tracking showing who worked on what
Technical documentation describing the uncertainty being resolved
Design documents and test records showing the experimentation process
Payroll records supporting the wage component
Contractor agreements showing the work was performed in the US, which series a funding accounting will also need at diligence

4. 9 Things to Know About the R and D Tax Credit

Items one to three determine whether you qualify. The rest affect how much you get.

The Definition Is Broader Than You Think

No laboratory required. Building software that solves a problem with no obvious solution, where you tried several approaches, typically meets the test. Most product engineering qualifies.

Routine Work Does Not Qualify

Bug fixes, routine updates, cosmetic changes and implementing a known solution all fail the uncertainty test. The distinction is whether the outcome was in doubt at the start.

The Payroll Offset Makes It Real for Startups

Qualifying small businesses can apply the credit against employer payroll taxes rather than income tax, which turns it into cash rather than a carried-forward asset.

Only US-Based Work Counts

Development performed outside the United States is excluded entirely. For companies with distributed engineering teams this materially affects the qualifying wage base.

Contractors Count at a Reduced Rate

Qualifying contractor costs are typically included at 65% rather than in full, and the contract terms matter. Work where the contractor retains rights may not qualify at all.

Section 174 Changed the Economics

Section 174 capitalization requires research expenses to be amortised rather than deducted immediately. This affects taxable income separately from the credit and caught many companies unprepared.

State Credits Stack

Many states offer their own credit and some are refundable, meaning cash regardless of liability. These are claimed separately and the qualification rules frequently differ from federal.

Documentation Must Be Contemporaneous

Project-level time records and technical documentation created during the work. An R and D tax credit guide that does not emphasise this is understating the examination risk.

The Election Timing Matters

The payroll offset election is made on a timely filed return. Missing the deadline can forfeit the ability to use the credit against payroll tax for that year entirely.

Series a funding accounting often surfaces unclaimed credits during diligence, which is a late and avoidable moment to discover them.

5. Case Study: The Payroll Offset That Funded Two Hires

What a Portland Startup Recovered From Three Prior Years

A Portland developer tools company had never considered the R and D credit, assuming it applied to hardware and pharmaceutical research rather than software.

A review of three years found qualifying engineering wages throughout, none of which had been treated as anything other than ordinary startup tax deductions. Two prior years were amended and the current year claimed with the payroll offset elected.

Year	Qualifying wages	Federal credit	Form
Year 1, amended	$612,000	$38,400	Income tax credit
Year 2, amended	$847,000	$52,100	Income tax credit
Year 3, current	$1,140,000	$71,300	Payroll offset
Oregon state credit	–	$19,600	State claim
Total identified	–	$181,400	–
Cash received within 12 months	–	$90,900	–

Series a funding accounting picked the credit up at the next raise. The current year payroll offset produced $71,300 in cash across four quarters, which funded two engineering hires. The amended years created carried-forward credits usable once the company became profitable.

6. Frequently Asked Questions

1. What is the R and D tax credit?

A federal credit against tax liability for qualified research expenses, with most states offering their own credit alongside. Qualifying activity must involve technical uncertainty resolved through a systematic process of experimentation.

2. Does software development qualify for the R and D credit?

Frequently yes. Building software where the technical approach was uncertain at the outset and several approaches were tested typically meets the four-part test. Routine maintenance and bug fixes do not.

3. Can a pre-revenue startup claim the credit?

Yes, through the payroll tax offset. Qualifying small businesses can apply the credit against employer payroll taxes rather than income tax, which turns it into cash rather than a carried-forward asset.

4. What is Section 174 capitalization?

Section 174 capitalization requires research and experimental expenditure to be amortised over several years rather than deducted immediately. It affects taxable income separately from the credit and increased tax bills for many loss-making companies.

5. What records do I need for an R and D claim?

Project-level time tracking, technical documentation describing the uncertainty being resolved, design and test records showing experimentation, payroll records, and contractor agreements confirming US-based work.

6. Can I claim for prior years?

Generally yes, by amending returns within the statute of limitations. The payroll offset election cannot be made retrospectively though, so amended years produce income tax credits rather than cash.

Conclusion

Most software companies qualify and many never claim. The barrier is almost always the assumption that the credit is for something else, which costs US startups a substantial amount every year.

Explore our fractional CFO services, read how to track expenses properly, or our diligence checklist. SaaS companies should see our SaaS accounting services.

Ask us whether your work qualifies.

About the Author

Animesh Shah | Accounting Lead, Finkeepers
Chartered Accountant with 15+ years leading accounting delivery for US businesses across QuickBooks, NetSuite, Odoo and Sage. Research credit guidance referenced here is published by the IRS.

Disclaimer

This article provides general guidance for educational purposes only. Credit eligibility, thresholds and state rules vary and change. Always consult a qualified CPA before claiming research credits. Last updated October 2026.

R and D Tax Credit Guide