India Explained
ImplementedBJPNarendra Modi

Aadhaar Act, 2016 and the national Aadhaar identity programme

A 12-digit biometric-linked identity number begun by the Planning Commission in 2009 and given statutory backing in 2016; the Supreme Court upheld the Act in 2018 while limiting mandatory linking.

Identity & Aadhaar · Idea originated under Manmohan Singh (2004)

Facts

  • The Unique Identification Authority of India (UIDAI) was set up on 28 January 2009 by a Planning Commission notification; Nandan Nilekani was appointed chairperson on 23 June 2009 and the first Aadhaar number was issued in September 2010 [1].
  • The Aadhaar (Targeted Delivery of Financial and Other Subsidies, Benefits and Services) Bill, 2016 was introduced on 3 March 2016 as a Money Bill by Finance Minister Arun Jaitley and passed by the Lok Sabha on 11 March 2016; opposition parties objected to its classification as a Money Bill [1]. The source does not state the date the Act came into force.
  • On 24 August 2017 the Supreme Court held that the right to privacy is a fundamental right [1].
  • On 26 September 2018 a five-judge bench upheld the Act's validity by majority, struck down Section 57 (use by private bodies for authentication) and Section 33(2), and held that mandatory linking with bank accounts, mobile numbers and school admissions was unconstitutional; Justice D. Y. Chandrachud dissented, finding the Act unconstitutional on procedural grounds and for violating privacy [1][3]. Aadhaar remained mandatory for income-tax filing and welfare schemes [1].
  • About 138.3 crore Aadhaar holders were enrolled by October 2024, and over 99.9% of the adult population held a number by May 2023 [1].
  • Cumulative Aadhaar authentications crossed 150 billion by the end of April 2025, with nearly 210 crore in April 2025 alone, and cumulative e-KYC transactions exceeded 2.39 billion, according to a MeitY statement [2].

Why

Reasons given by those who did it

  • The Act's long title refers to the targeted delivery of financial and other subsidies, benefits and services, indicating the stated purpose of directing welfare transfers to intended recipients [1].
  • UIDAI's chairman was reported in 2018 as saying savings from Aadhaar-enabled direct benefit transfers exceeded Rs 90,000 crore by 31 March 2018, mainly through the public distribution system [4].

Criticism of that reasoning

  • Opposition parties objected that passing the Bill as a Money Bill limited the Rajya Sabha's role [1]; Justice Chandrachud's dissent in 2018 found the Act unconstitutional on procedural grounds and for violating privacy [3].
  • Critics cited the threat of exclusion from benefits and privacy risks; the Supreme Court restricted mandatory use in 2018 [1][3].

Benefits and concerns

Benefits (2)

  • Near-universal coverage gives a common identity verification layer used across welfare and financial services.About 138.3 crore holders (October 2024), over 99.9% of adults (May 2023) [1]; over 150 billion authentications and 2.39 billion e-KYC transactions by April 2025 [2].
  • Officials claim reduced leakage in welfare transfers.The UIDAI chairman's 2018 claim of over Rs 90,000 crore in savings (as reported in a PTI-based Economic Times article hosted by UIDAI) is a government claim; independent verification was not located for this entry [4].

Concerns (2)

  • Authentication failures have led to reported denial of welfare benefits.Wikipedia reports that authentication failures from network problems or faded fingerprints have led to people being denied food aid [1]. The scale of exclusion is disputed and is not quantified here.
  • Data security and leakage incidents.Government officials told the Supreme Court in May 2017 that Aadhaar data had been leaked several times that year; in January 2018 The Tribune reporters said they bought administrator-level access for Rs 500, after which UIDAI filed a criminal complaint against the journalists; the Centre for Internet and Society estimated about 135 million records may have leaked [1].

Evidence points

+12.5
points, mean of two scorers (scale −25 to +25)
+12 to +13
range between the two scorers' totals
Medium confidence
scorers agree within 1 point on every criterion
ReachHow many people did the action materially affect?
Mean +5.0A +5B +5
Outcome evidenceDo official or independent data show the intended result (or its opposite), compared with the era baseline and peers?
Mean +2.0A +2B +2
Cost and sustainabilityIs the fiscal cost proportionate, and is the effect durable?
Mean +2.0A +2B +2
Process and rightsWas it made with debate, consultation and legal soundness, and did it respect rights and court rulings?
Mean −0.5A 0B −1
DeliveryWas it implemented as announced, on time and at scale?
Mean +4.0A +4B +4

Positive meanNegative meanScorer AScorer B

Scorer A. Near-universal enrolment and large transaction volumes, offset by Money Bill objections, partial court limits on mandatory linking and exclusion and security concerns.

Scorer B. Near-universal coverage and large authentication volumes, but passed as a Money Bill, partly struck down in 2018 and linked to exclusion and data-security concerns.

Context used when scoring

Era baseline
In 2009 India had no single universal identity credential; welfare programmes relied on multiple ration, voter and local documents, and the same year the Planning Commission began the UIDAI project.
Lag before outcomes show
3 years
Shocks considered
puttaswamy-privacy-judgment-2017, covid-2020
Uncertainty
Medium confidence. Scorer totals are +13 and +12. How uncertainty is shown.

In depth

Aadhaar began as an administrative project in 2009 under the Planning Commission and operated for seven years without a dedicated statute. The 2016 Act gave it a legal basis and defined permitted uses, framed around the targeted delivery of subsidies and benefits. Because the Bill was certified as a Money Bill, it did not need the Rajya Sabha’s approval, which opposition parties contested.

The Supreme Court’s 2018 judgment upheld the Act by majority while narrowing it: private-sector authentication provisions were struck down, and linking was held unconstitutional for bank accounts, mobile numbers and school admissions, though it stayed mandatory for tax filing and welfare schemes. One judge dissented on both procedural and rights grounds.

Supporters cite the scale of enrolment and use, and the government has claimed large savings in welfare transfers. Critics cite reported exclusions from benefits when authentication fails, and several data-security incidents. The entry date used here is the Lok Sabha passage of the Bill (11 March 2016); the source consulted does not give the Act’s commencement date, which should be confirmed from the Gazette. The savings figure is an official claim and has not been independently verified for this entry, and the Court summary cited is a secondary summary of the judgment rather than its text.

Sources

  1. Aadhaar
    WikipediaMedia

Last reviewed .Report an error orchallenge a score.

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