- The CASLI Generalist Knowledge Exam costs $280 regular or $225 for RID members.
- The CASLI Generalist Performance Exam for CDI costs $395 regular or $310 for RID members.
- A single failed section (Fundamentals or Case Studies) can be retaken alone for $140.
- An audiogram showing 65db or more hearing loss is required for Deaf-interpreter rates and eligibility.
CDI Certification Cost Overview for 2026
Anyone researching the CDI certification quickly discovers that the "cost" isn't a single number - it's a sequence of fees tied to a multi-stage testing process run jointly by the Registry of Interpreters for the Deaf (RID) and the Center for the Assessment of Sign Language Interpretation (CASLI). RID owns the eligibility requirements, CASLI develops and administers the actual exams, Meazure Learning (formerly Scantron) delivers the computer-based knowledge exam at contracted testing sites, and a Local Test Administrator schedules the performance exam directly with the candidate.
Understanding CDI certification cost means understanding this pipeline, because each stage has its own fee, its own timeline, and its own consequences if you fail. Before you spend a dollar, it helps to review the CDI requirements in full so you know exactly which fees actually apply to your situation.
Complete CASLI Fee Breakdown
The path to becoming a Certified Deaf Interpreter runs through two major CASLI exams, each with its own pricing tier and its own internal structure. Here's the full breakdown of what candidates actually pay.
| Exam Component | Regular Fee | RID Member Fee |
|---|---|---|
| CASLI Generalist Knowledge Exam (CGKE) - full exam | $280 | $225 |
| CASLI Generalist Performance Exam for CDI | $395 | $310 |
| Single Fundamentals or Case Studies retake (Gap Test) | $140 | $140 |
The CGKE itself is not one monolithic test - it's split into two distinct parts that candidates must pass separately:
- Fundamentals of Interpreting: 120 multiple-choice questions. Sixty are presented in written English with English answer options, and sixty are presented in ASL with ASL answer options. Candidates cannot choose a language of preference; both formats are mandatory.
- Ethical Decision Making and Cultural Responsiveness Exam: Eight multi-step case studies that assess applied judgment rather than rote recall.
Candidates must pass Fundamentals of Interpreting before they're even eligible to sit the performance exam. If a candidate passes one part but fails the other, only the failed portion needs to be retaken - at the reduced $140 rate - rather than paying full price again. For a section-by-section look at how these components are weighted and tested, see the CDI Exam Domains Guide.
Key Takeaway
Because Fundamentals and Case Studies are scored and retaken independently, a partial failure never forces you to pay the full $280/$225 fee again - budget for the $140 gap-test rate instead.
Hidden and Indirect Costs
The published CASLI fees are only part of the real financial picture. Several indirect costs shape what CDI certification actually costs a candidate over time:
Education and Eligibility Costs
RID's education requirement is a bachelor's degree in any field, or completion of RID's Alternative Pathway (effective May 17, 2021). Candidates without a degree already in hand need to weigh tuition or Alternative Pathway program costs against the exam fees themselves - this is frequently the largest expense in the entire certification process, even though it isn't a CASLI fee at all.
- Bachelor's degree completion (any field) satisfies the requirement
- RID's Alternative Pathway is the non-degree route
- The 40-hour training requirement was removed in June 2021 to create equity with hearing interpreters, eliminating one former cost line item
Audiogram Documentation
To qualify for Deaf-interpreter rates and eligibility, candidates must submit an audiogram showing hearing loss of 65db or more in one or both ears. The audiogram doesn't need to be recent, but it must name the applicant and the audiologist or office. If you don't already have documentation on file, budget time and a possible audiology appointment fee to obtain one before you register.
Other indirect costs to plan for include travel to a Meazure Learning testing site or a Local Test Administrator's location, time away from paid interpreting work to prepare and test, and any prep materials or courses you use along the way - such as a CDI study guide or structured practice tests through CDI Exam Prep.
RID Member vs. Non-Member Pricing
RID membership consistently lowers CASLI exam fees. Across both major exams, the member discount is meaningful:
- CGKE: $225 member vs. $280 regular - a $55 difference
- Performance Exam for CDI: $310 member vs. $395 regular - an $85 difference
Combined across both exams, an RID member saves $140 compared to a non-member paying full price for both - almost exactly the cost of one gap-test retake. For most candidates who plan to test even once, running the numbers on annual membership dues against this combined savings is worth doing before registering. It's also worth noting this is separate from the professional networking, publications, and advocacy resources RID membership provides, which many CDIs use throughout their careers after reviewing CDI jobs and hiring pathways.
Retake Costs and the Bridge Plan
Not every candidate starts from zero. Some interpreters passed the legacy CDI-Knowledge Exam, which was retired on January 1, 2021 and replaced by the CASLI Generalist Knowledge Exam. Because the old exam was built from RID's 2000 Role Delineation Study, while the CASLI Generalist Performance Exam for Deaf Interpreters (released November 16, 2020) derives from CASLI's 2018 Deaf Interpreter Job Task Analysis, the two exams aren't interchangeable. Candidates who passed the retired exam must complete a bridge plan - an unscored learning module plus the Case Studies gap test - before moving forward.
For candidates taking the current exams from scratch, retake costs follow this logic:
- Fail Fundamentals only: retake Fundamentals alone for $140
- Fail Case Studies only: retake Case Studies alone for $140
- Fail both: retake the full CGKE at the $280/$225 rate
- Failed knowledge exams require a three-month waiting period before retaking
Timing matters here too. Exams must be taken within one year of purchase or before the testing cycle expiration, whichever comes first, and the full testing cycle runs five years from the first PASS notification. A missed deadline means paying again from the start, so review the CDI Exam Dates guide before you purchase any exam to avoid forfeiting a fee to a lapsed window.
Budgeting Your Prep Around the Exam Domains
Because retakes cost money and time, the smartest way to control your total CDI certification cost is to avoid needing a retake in the first place. That means allocating study time deliberately across the four content areas rather than reviewing everything equally. The CDI Exam Domains Guide breaks these down in depth, but here's how they map onto a cost-conscious prep schedule:
Domain 1: Pre-Commitment Activities
Covers the decisions a Deaf interpreter makes before accepting an assignment - assessing fit, identifying potential conflicts, and determining whether the request matches their competencies.
- Weak preparation here often shows up as missed Case Studies items, which is the exact section that costs $140 to retake alone
Domain 2: Pre-Encounter Activities
Focuses on preparation once an assignment is accepted, including logistics, team coordination, and gathering context before the encounter begins.
- Tested heavily in the ASL-presented half of the Fundamentals section
Domain 3: The Encounter
The largest practical component - real-time interpreting decisions, communication adjustments, and collaboration with a hearing/Deaf interpreter team during the actual encounter.
- Central to the performance exam, where a weak showing can mean waiting up to 90 days for results only to learn a retake is needed
Domain 4: Post-Encounter Activities
Debriefing, documentation, and professional follow-up after the encounter concludes.
- Frequently underestimated, yet it appears consistently across multi-step case studies
Fundamentals of Interpreting
- Drill both English and ASL question formats since no language preference is allowed
- Target Domains 1 and 2 concepts as they appear in multiple-choice form
Ethical Decision Making and Cultural Responsiveness
- Practice multi-step case studies covering all four domains
- Review how Domain 4 post-encounter reasoning gets tested in later steps of each case
Performance Exam Readiness
- Rehearse Domain 3 encounter scenarios with a practice partner
- Confirm scheduling with your Local Test Administrator early to protect your one-year testing window
If you're unsure how much total study time to plan for, the How Hard Is the CDI Exam guide and the CDI Pass Rate breakdown both offer useful context for setting realistic expectations before you commit money to a testing date.
Is the Cost Worth It?
Total out-of-pocket cost for a candidate who passes everything on the first attempt, holds RID membership, and already meets the education requirement comes to $225 (CGKE) plus $310 (performance exam) - $535 in direct CASLI fees. Non-members without prior education completed face a substantially higher total once degree or Alternative Pathway costs and full non-member exam fees are factored in.
Whether that investment pays off depends on your career goals, the demand for CDIs in your region, and how you plan to use the credential. For a full financial comparison against career earnings, see the CDI Salary Guide and the dedicated ROI analysis on CDI certification. Many candidates also use structured practice exams through CDI Exam Prep to reduce the risk of paying for a retake, since avoiding even one $140 or $280 fee often offsets the cost of quality prep materials outright.
Frequently Asked Questions
At CDI rates effective since January 1, 2023, the CGKE costs $280 regular or $225 for RID members, and the CASLI Generalist Performance Exam for CDI costs $395 regular or $310 for RID members. Total direct exam fees range from $535 (member) to $675 (non-member), not including education requirements, audiogram documentation, or prep materials.
Yes. Members save $55 on the CGKE and $85 on the performance exam, for a combined $140 in savings across both exams - equivalent to one full gap-test retake fee.
A single failed Fundamentals of Interpreting or Case Studies section can be retaken alone for $140, rather than repaying the full CGKE fee, as long as the other section was already passed.
No. Candidates who passed the retired CDI-Knowledge Exam complete a bridge plan instead - an unscored learning module plus the Case Studies gap test at the $140 rate - rather than the full CGKE fee.
Plan for the cost or time investment of meeting the bachelor's degree or Alternative Pathway education requirement, obtaining an audiogram documenting 65db or more hearing loss if you don't already have one on file, travel to a testing site or Local Test Administrator, and any study materials you use to prepare.