State program
Delaware Research and Development Tax Credit
A refundable state credit that mirrors the federal calculation and pays cash to companies with no Delaware tax liability.
- Refundable
- Pre-approval required
Last reviewed October 2026
Program overview
Delaware modernised its research credit by removing the annual program cap and making credits fully refundable, which was a significant change for early-stage companies. Taxpayers compute the credit as a percentage of the federal credit attributable to Delaware research, with a more generous rate for small businesses. Applications are filed with the Delaware Division of Revenue after the federal return is completed, so the state claim follows the federal claim each year.
Eligibility
Taxpayers claiming a federal research credit for qualified research conducted in Delaware. Small businesses with gross receipts under $20 million receive the enhanced rate.
Benefits
Fully refundable credit paid in cash when it exceeds Delaware income tax liability.
Caps, deadlines and forms
Caps and limits
- Delaware modernised its research credit by removing the annual program cap and making credits fully refundable, which was a significant change for early-stage companies.
Deadlines
- Applications are filed with the Delaware Division of Revenue after the federal return is completed, so the state claim follows the federal claim each year.
Forms
Filing forms are listed by the revenue authority: official source (opens in a new tab).
Delaware IDR questions
What an examiner is likely to ask about this credit. S1–S7 apply to every state claim; the rest come from this program's own rules.
- S1Confirm the research was physically performed within Delaware.
- S2Provide the Delaware qualified research expense calculation and base amount.
- S3Reconcile Delaware expenses to the federal Form 6765.
- S4Show how wages and supplies were apportioned between Delaware and other locations.
- S5Provide the Delaware return and credit schedule for each year claimed.
- S6Show the carryforward schedule for unused Delaware credits.
- S7Confirm the entity claiming the credit is the entity subject to Delaware tax.
- DE-1Provide the pre-approval, certification or application filed for the Delaware credit, with its filing date.
- DE-2Show the Delaware refund eligibility tests (such as small business status) were met in each year refunded.
Draft questions for illustration, reviewed by a specialist before any engagement.
Common weak spots
- Expenses for research performed outside Delaware included in the Delaware claim.
- Missing or late pre-approval: the application or certification was not in place when required.
- Caps and proration not modelled, so the expected benefit is overstated.
- Refund claimed without evidence that the eligibility tests were met.
- Base amount computed from incomplete historical records.
See how your claim holds up
The mock audit drafts these questions for your own claim and scores the evidence behind each answer.
Run a mock audit for DelawareInformation on this page is general in nature, not tax advice. Program details change frequently; always confirm current rules with the relevant revenue authority or engage a specialist before acting. Last reviewed October 2026.
Find out what your research actually qualifies for
A scoping conversation takes thirty minutes and costs nothing. You leave with a view on eligibility, likely credit range and the documentation you would need.
Free R&D mock audit: completely free. Book a call or email hello@creditarmor.ai for a login.
