State program
South Carolina Research Expenses Credit
A simple, broadly available credit with a long carryforward, frequently used by the state's manufacturing base.
- Offset only
Last reviewed October 2026
Program overview
South Carolina grants a credit equal to a percentage of qualified research expenses incurred in the state, using the federal Section 41 definition of qualified research. Unlike many states, the calculation is applied to total in-state qualified research expenses rather than to an increase over a base amount, which simplifies the analysis considerably. The annual credit is capped at a share of liability, but the ten-year carryforward preserves value for growing companies.
Eligibility
Taxpayers with qualified research expenses, as defined under IRC Section 41, for research conducted in South Carolina.
Benefits
Non-refundable credit limited to 50% of South Carolina tax liability after all other credits.
Caps, deadlines and forms
Caps and limits
- The annual credit is capped at a share of liability, but the ten-year carryforward preserves value for growing companies.
- Non-refundable credit limited to 50% of South Carolina tax liability after all other credits.
Deadlines
Claimed on the annual return; no separate application deadline is stated.
Forms
Filing forms are listed by the revenue authority: official source (opens in a new tab).
South Carolina 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 South Carolina.
- S2Provide the South Carolina qualified research expense calculation and base amount.
- S3Reconcile South Carolina expenses to the federal Form 6765.
- S4Show how wages and supplies were apportioned between South Carolina and other locations.
- S5Provide the South Carolina return and credit schedule for each year claimed.
- S6Show the carryforward schedule for unused South Carolina credits.
- S7Confirm the entity claiming the credit is the entity subject to South Carolina tax.
Draft questions for illustration, reviewed by a specialist before any engagement.
Common weak spots
- Expenses for research performed outside South Carolina included in the South Carolina claim.
- Caps and proration not modelled, so the expected benefit is overstated.
- 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 South CarolinaInformation 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.
