Service Preference and DAF: How Preferences Work in UPSC CSE

Every Civil Services Examination candidate puts the services he or she wants in order, and the Government allots a service only from that list. In CSE 2026 the order of services is given in the online application form itself, before the prelims, and the notice permits no change once submitted, except as provided for the window after the mains result. IAS and IPS aspirants also give a home cadre preference when UPSC asks for it.

This guide sets out, from UPSC's notices and the CSE Rules, where each preference is given, what became of the Detailed Application Form (DAF), and how the Government uses your list. It ends with advice on filling it in.

Where you give what, in CSE 2026

Stage	What you give or update
Online application, before the prelims	Your details and claims, and the order of services. No change is allowed in the form once submitted.
10-day window after the prelims result	Mains fee, scribe and other facilities, and a check of your details to get the e-admit card. For CSE 2026, UPSC also used this window, 19 to 28 June 2026, for filling in the cadre preference.
15-day window after the mains result	Proof of your degree, and updates such as address, higher education, achievements, employment, any service already allotted from an earlier CSE, family details and the OBC or EWS annexure.
Interview	The board has "a record of the candidate's career" before it.

The notice's rule on changes is short: "No change in preference for Services and Home Cadre (applicable for IAS/IPS) once submitted by a candidate would be permitted except as provided in Para B.3", the window after the mains result. The CSE 2025 Rules expressly let candidates update their service and cadre preference in that window. The CSE 2026 Rules' list of fields for the window does not mention preferences, so do not count on a second chance.

What the DAF was

Until CSE 2024, preferences went into a separate Detailed Application Form, filled after the prelims. The form has changed twice since:

• Up to CSE 2024: DAF-I and DAF-II. Everyone who qualified in the prelims had to "apply again" in DAF-I for the mains. Everyone called for the interview then filled DAF-II, giving the order of services and, for the IAS and IPS, the order of zones and cadres, with no change allowed after submission.
• CSE 2025: one online form. UPSC introduced a new registration and online application form in four parts, the third still called the DAF, and asked for service preferences at the application stage. The notice planned to take the cadre preference in the 10-day window after the prelims result, but UPSC's note on the prelims result left it out of that window. Its note on the mains result said the cadre preference would be sought later from candidates called for the interview. The CSE 2025 Rules let both preferences be updated in the window after the mains result.
• CSE 2026: no "DAF" at all. The notice speaks of a Common Application Form with an exam-specific module. The order of services goes in at the application stage, and UPSC took the cadre preference in the window after the prelims result.

The old zone preferences went with the 2017 cadre policy. The 2026 policy works from your home state and your willingness to serve there, as the cadre allocation guide explains.

How the Government uses your list

• Rank, then preference. Candidates are allotted to services keeping in view their ranks and the preferences they expressed. The Rules promise "due consideration" to your order at allocation.
• Only what you listed. You are considered only for the services you listed. If you list none, you are not considered for service allocation at all.
• A higher choice for reserved categories. SC, ST, OBC, EWS and PwBD candidates recommended on general merit may be adjusted against reserved vacancies if that gets them a service higher in their order.
• Cadre by policy. For the IAS and IPS, the cadre is allotted under the cadre allocation policy in force at the time.
• Suitability last. The Rules give no right to a service until the Government is satisfied about your character, antecedents, certificates and medical examination.

Filling in your order: advice

This part is our advice, built on the rules above.

• List only what you would join, in your true order. A service left off can never be given to you, and the Government gives due consideration to the order you choose. Do not pad the list with services you would refuse.
• Check the conditions that differ by service. The IAS, IFS and IPS need Indian citizenship. PwBD candidates should check which services the notice identifies as suitable for their category, and everyone should read the medical and physical standards in Appendix III of the CSE Rules.
• Read what each service involves. Appendix II of the CSE Rules 2026 gives each service's probation, pay grades and liability to serve; our guides to all 23 services and the services beyond the IAS and IPS summarise them.
• Know the re-appearance rules. Members of the IAS or IFS cannot sit the exam again while they remain in that service. Someone allotted the IPS or a Group A service from CSE 2026 may sit CSE 2027 only with an exemption from training, and someone already selected for the IPS cannot opt for it again.
• Keep a copy. Save or print what you submit at each stage.

For how the two most-compared services differ, read IAS vs IPS and IAS vs IFS.