What is the Research and Development (R&D) Tax Credit?

The R&D credit (§41) is 20% of qualified research expenses (QREs) above a base amount, or 6% of QREs under the alternative simplified credit (ASC) method. QREs include: wages for qualified research activities, supplies used in research, and 65% of contract research expenses. The credit is subject to the general business credit limitations. [IRC §41]

How can startups use the R&D credit against payroll taxes?

Qualified small businesses (QSBs) can elect to apply up to $500,000 of R&D credit against employer payroll taxes (FICA) instead of income tax. A QSB is a company with less than $5 million in gross receipts and no more than 5 years of gross receipts. This is valuable for pre-revenue startups that have no income tax liability. The election is made on Form 6765 and applied on Form 941. [IRC §41(h)]

What is the Work Opportunity Tax Credit (WOTC)?

The WOTC (§51) is a credit for hiring individuals from targeted groups: veterans, ex-felons, long-term TANF recipients, SNAP recipients, SSI recipients, vocational rehabilitation referrals, and summer youth employees. The credit is generally 40% of first-year wages up to $6,000 ($24,000 for certain veterans) = maximum $2,400 per employee ($9,600 for veterans). [IRC §51]

How does the general business credit limitation work?

The general business credit is limited to net income tax minus the greater of: (1) tentative minimum tax; or (2) 25% of net regular tax liability above $25,000. Excess credits carry back 1 year and forward 20 years. The ordering rules for using credits: carrybacks from the current year first, then carryforwards from earliest year, then current year credits. [IRC §38(c)]

What is the Low-Income Housing Tax Credit (LIHTC)?

The LIHTC (§42) provides a credit for investing in low-income housing. The credit is 9% of qualified basis for new construction (or 4% for acquisition/rehabilitation). Credits are claimed over 10 years. LIHTC investments are typically structured as limited partnerships, and the credits are allocated to investors. The credit is subject to recapture if the property fails to maintain low-income status. [IRC §42]

IRS Form — General Business Credit

Form 3800 — General Business Credit

Form 3800 is used to calculate the total general business credit — the aggregate of all individual business credits claimed by the taxpayer. It includes the R&D credit (Form 6765), Work Opportunity Tax Credit (Form 5884), energy credits (Form 3468), and dozens of other business credits. For tax professionals, Form 3800 is the gateway to significant business tax savings — particularly the R&D credit, which many small businesses overlook.

✓ Verified 2026 General Business Credit Rules

✓ R&D Credit Rules Confirmed

✓ WOTC Rules Confirmed

✓ Carryforward/Carryback Rules Confirmed

20 Years

General Business Credit Carryforward Period

1 Year

General Business Credit Carryback Period

R&D Credit

Most Valuable Component — Up to 20% of Qualified Research Expenses

IRC §38

General Business Credit Authority

Key Rules and Authority

Rule	Detail
Carryforward	20 years
Carryback	1 year
R&D Credit Rate	20% of qualified research expenses above base
R&D Alternative Simplified Credit	14% of QREs above 50% of prior 3-year average
WOTC	Up to $9,600 per qualifying hire
Passive Activity Limitation	Business credits limited by passive activity rules

R&D Credit — The Most Overlooked Business Credit

The Research and Development (R&D) credit (Form 6765) is one of the most valuable and most overlooked business credits. Many small businesses qualify for the R&D credit without realizing it — the credit applies to any business that develops or improves products, processes, software, or formulas. Qualifying activities include: developing new software, improving manufacturing processes, designing new products, testing prototypes, and conducting experiments. The credit is 20% of qualified research expenses (QREs) above a base amount, or 14% under the Alternative Simplified Credit (ASC) method. Qualified small businesses can use up to $250,000 of the R&D credit to offset payroll taxes (Form 941) instead of income tax — making it valuable even for businesses with no income tax liability.

Frequently Asked Questions

My client is a software startup with no taxable income. Can they still benefit from the R&D credit?

Yes — qualified small businesses can elect to apply up to $250,000 of the R&D credit against their payroll tax liability (Form 941) instead of income tax. A "qualified small business" is one with less than $5 million in gross receipts and no gross receipts for any year before the 5-year period ending with the current tax year. This makes the R&D credit immediately valuable for startups that have R&D expenses but no income tax liability. The election is made on Form 6765 and the credit is claimed on Form 941 in the quarter after the election is made. Starting in 2023, the payroll tax offset limit increased to $500,000 per year.

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Form 3800 — General Business Credit

Key Rules and Authority

R&D Credit — The Most Overlooked Business Credit

Frequently Asked Questions

Master Business Credit Planning for Your Clients

Related Resources

Free Access for Tax Professionals

Form 3800 — General Business Credit

Key Rules and Authority

R&D Credit — The Most Overlooked Business Credit

Frequently Asked Questions

Master Business Credit Planning for Your Clients

Related Resources