CSAS Portal UG 2026: Complete Registration Guide for Delhi University

Securing a seat at the prestigious University of Delhi (DU) is a dream for hundreds of thousands of undergraduate aspirants across India. With the release of the Common University Entrance Test (CUET) UG results, the focus shifts entirely to DU's dedicated admission platform. The Common Seat Allocation System, commonly known as the CSAS portal, serves as the single-window mechanism through which admissions to all undergraduate programs across 69 constituent colleges are processed.  

For the academic session 2026–27, Delhi University has opened admissions for 73 undergraduate programs and over 150 B.A. program combinations, boasting a total seat matrix of 71,624 seats. The university received over 1.9 lakh applications this year, with more than 1.64 lakh students successfully locking in their preference forms.  

Navigating the multi-phase online ecosystem can be challenging, and a single error during registration or subject mapping can cost you your preferred seat. This comprehensive guide outlines the step-by-step registration process, essential dates, subject-mapping parameters, and strategic tips to maximize your chances of securing an allotment in 2026.  

Key Highlights of DU UG Admissions 2026

Before diving into the granular steps of the registration, let us look at the structural framework governing the system this year:

• Unified Admission Portal: All allocations are carried out strictly online via the official portal at ugadmission.uod.ac.in. No offline forms or direct college applications are accepted.

• The Virtual Wallet System: A major candidate-friendly update introduced in 2026 is the automated virtual wallet. If you pay your admission fee in an early round and later upgrade to a different program or college, the portal automatically transfers or adjusts the balance. This eliminates the tedious process of paying repeatedly and waiting for manual refunds.

• Three-Phase Structure: The entry architecture is divided into three distinct steps: Profile Creation, Choice Filling/Subject Mapping, and Seat Allocation/Acceptance.  

  
  

Step-by-Step CSAS Portal UG 2026 Registration Process

Fulfilling your entry criteria requires navigating three mandatory phases. Missing or ignoring any of these stages will automatically disqualify you from the final seat allocation lists.

Phase 1: Applying to the University of Delhi

Phase 1 constitutes the baseline application process, where your primary academic and personal data are synchronized with official records. This phase officially commenced on June 26, 2026.  

1. Portal Access: Navigate to the official link ugadmission.uod.ac.in.

2. Account Authentication: Register using your unique CUET UG 2026 Application Number and password. Do not share these credentials, as all official allocation updates will modify this specific dashboard.  

3. Profile Integration: The portal automatically imports your personal details, photograph, and signature from the National Testing Agency (NTA) database. Verify that these match your identity proofs exactly.

4. Document Upload: Upload scanned copies of your Class 10 and Class 12 mark sheets, alongside valid category certificates (OBC-NCL, EWS, SC, ST, PwBD, or Supernumerary Quotas like ECA and Sports) if applicable.  

5. Fee Realization: Complete the mandatory, non-refundable registration fee payment online.

   
   

CSAS Portal UG 2026 Application Fee Matrix

Category	Application Fee (INR)
UR / OBC-NCL / EWS	₹250.00
SC / ST / PwBD	₹100.00
Additional Fee per Quota (ECA / Sports)	₹100.00
Performance-Based Programs (BFA / Music / B.Sc PE)	An additional ₹400.00

Phase 2: Subject Mapping and Preference Selection

Phase 2 opened on July 3, 2026, and closed on July 11, 2026. This is the most critical juncture of your application, as it directly impacts your technical eligibility scores.  

• Subject Mapping Rule: You are required to map the subjects you cleared in your Class 12 board examinations with the specific test papers you attempted in the CUET UG 2026 exam. Delhi University enforces a strict rule: Candidates must have appeared in CUET only in those subjects which they passed in Class 12. If you map unrelated papers, your score for that program calculation will be treated as zero.  

• Preference Generation: Once mapping is completed successfully, the portal automatically filters and displays all valid "Programme + College" combinations you are eligible for based on your CUET score combinations.  

• Ordering Choices: You can select as many combinations as you want. Arrange them from highest preference (rank 1) to lowest preference. Use the "Advanced Filter" to isolate specific colleges or courses.

Pro Tip: Never limit your options. Select all possible combinations you would willingly join. If you do not list a college-course pairing in this step, the allocation algorithm will bypass you for that option, regardless of how high your CUET merit score is.

Phase 3: Seat Allocation and Admission

Once preferences are saved, the system transitions into the automated seat distribution engine. The evaluation moves through three critical components:

1. Simulated Ranks: Released prior to the actual lists, simulated ranks provide an estimated overview of where you stand relative to other applicants for your selected choices. A brief "Preference Change Window" opens right after, allowing you to reorder your lists strategically.  

2. Seat Allocation Lists: Seats are allocated based on your position in the category-specific merit list, availability, and your preference order.

3. Acceptance and Verification: If a seat is allocated, you must actively click "Accept Allotment" within the specified window. The respective college will inspect your uploaded documents online. Once approved, you must pay the admission fee via your portal dashboard to secure the seat.  

   
   

Admission Schedule and Timelines for 2026

Adhering to the official timeline is paramount. missing a single deadline will result in your permanent exclusion from subsequent routine rounds.

Event / Admission Activity	Date	Time / Deadline
Phase 1 Registration Commencement	June 26, 2026	—
Phase 2 Preference Filling Beginning	July 3, 2026	—
Closing Window for Phase 1 and Phase 2	July 11, 2026	11:59 PM
CSAS UG Correction Window	July 10 to July 11, 2026	11:59 PM
Declaration of Simulated Ranks	July 12, 2026	5:00 PM
Preference Change Window	July 12 to July 13, 2026	4:59 PM
First CSAS Seat Allocation List	July 16, 2026	5:00 PM
Round 1 Seat Acceptance Window	July 16 to July 18, 2026	—
Online College Verification and Approval	July 16 to July 20, 2026	—
Last Date for Online Admission Fee Payment	July 21, 2026	11:59 PM
Second CSAS Seat Allocation List	July 25, 2026	12:00 Noon
Commencement of New Academic Session	July 28, 2026	—

Strategy Tips to Avoid Common Registration Pitfalls

1. Verify Your Category Certificates Early: Certificates for OBC-NCL and EWS must be issued in the correct format by competent authorities and must be valid for the financial year 2026–27. Check that the name on your certificate matches your Class 10 and 12 certificates exactly.

2. Utilize the Simulated Ranks Effectively: Do not panic if your simulated rank appears low. Use the preference change window to ensure that your dream colleges are stacked at the top, followed by realistic backups lower down. Moving a realistic choice higher up does not improve your chances against someone with a higher score, but omitting it entirely will prevent allocation.

3. The "Freeze vs. Upgrade" Dilemma: Once you are allocated a seat in Round 1, pay the fee to lock it down. If you want to aim for a higher-ranked preference in Round 2, select the Upgrade option. If you are entirely satisfied with your allocation, choose Freeze. If you choose neither or fail to pay the fee, you forfeit the seat and drop out of the admission system completely.

   
   

Frequently Asked Questions (FAQs)

Q1. What is the official website for the CSAS Portal UG 2026 registration process?

The official website for all undergraduate admissions at Delhi University is ugadmission.uod.ac.in. Candidates must access this specific link to complete their subject mapping, upload academic documents, and pay the registration fees.

Q2. Can I apply for Phase 2 without completing the Phase 1 registration?

No. Only candidates who have successfully filled out their personal profile, uploaded their documents, and paid the non-refundable application fee in Phase 1 are permitted to unlock Phase 2 preference filling.  

Q3. What happens if I make a mistake in my subject mapping on the CSAS Portal UG 2026?

Subject mapping must be executed with absolute accuracy. You must map the subjects you cleared in Class 12 with the corresponding test papers you took in CUET UG 2026. If you map mismatched or incorrect subjects, the university will disqualify your eligibility for the affected course combinations, leading to rejection during college-level document verification.  

Q4. Can I change my college preferences after the first allocation list is declared?

You cannot alter your preference list while a seat allocation round is actively being processed. However, if you opt for an "Upgrade" after accepting your Round 1 seat, the portal will grant you a specific window to reorder the preferences that sit above your currently allocated choice. You cannot reorder options that were lower than your allocated seat.

Official Admissions Helpline and Call to Action

Do not leave your college allocation to last-minute technical glitches. If you haven't finalized your profile parameters, log in immediately to complete the steps. Keep checking your dashboard regularly for notices regarding sports trials, extracurricular activities (ECA) schedules, and supernumerary quota seat matrix distributions.

For official updates, direct queries, and step-by-step assistance, refer to the verified channels provided below:

• Official DU UG Admission Portal: Access your profile, map test papers, and review allocation rounds via the Delhi University CSAS UG Registration Link.

• Comprehensive Bulletins and Cut-offs: To download the official prospectus, seat matrices, and eligibility criteria sheets, visit the main Delhi University Admission Information Page.

• Admissions Helpdesk & Grievance Cell: For official troubleshooting regarding registration failures or payment errors, contact the central helpdesk at +91 8065068768 or approach the desk at the Campus Law Centre, University of Delhi.