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Accounting Firm

K. S. Aiyar & Co.

Mumbai chartered accountants established in 1897, offering audit, tax and advisory services mainly to large corporates

K. S. Aiyar & Co. cover

About K. S. Aiyar & Co.

Chartered accountants in Mumbai, K. S. Aiyar & Co. says it is the oldest accounting firm in India, tracing its start to Calicut in 1897 and its move to Mumbai in 1900. The firm is an independent member of LEA Global, and its clients are mainly large corporates that need audit, tax and advisory work across the country.

Audit, assurance and due diligence

Audit engagements include statutory and VAT work. Reviews ahead of an acquisition, along with investigations, sit within the audit and assurance practice, which the firm describes as a comprehensive professional service for large companies. Its assurance work is carried out on the basis of independence and professional standards.

Tax advice on direct, indirect and transfer pricing

The taxation practice gives consultancy and advice on direct tax and covers indirect taxation, including VAT. Transfer pricing and tax audit work are listed alongside the advisory work, so a company's domestic and cross-border tax questions can be handled by the same team.

Restructuring, valuation and advisory work

Advisory services include governance and risk management, business advice, corporate restructuring, corporate recovery, mergers and acquisitions, and valuation. The firm presents these as the means by which clients keep a business on course through periods of change.

Regulatory, legal and secretarial support

For international investors, the firm offers regulatory consulting, including advice on foreign exchange rules. It also provides legal and secretarial services, US GAAP restatement and general accounting support, and it lists personnel recruitment and management consulting among its other work.

Community work through a foundation and gallery

The firm supports community work. Its foundation is a joint venture with a US counterpart that connects sponsors with rural village children living below the poverty line, and it supports education for underprivileged children and skills training for villagers. Its premises include a gallery that displays and sells work by local and emerging artists, with the sales supporting the firm's charitable activities.

Head office in Mumbai and a practice carried forward

The head office is in Mumbai, with offices in Hyderabad and Chennai. The firm describes its approach with the phrase assurance across three centuries, meaning a practice carried forward from the nineteenth century, and it says its values have not changed with the times.

TrustList summary

K. S. Aiyar & Co. is a Mumbai firm of chartered accountants that describes itself as the oldest accounting firm in India. Kalyan Subramani Aiyar started it in Calicut in 1897 and moved it to Mumbai, then Bombay, in 1900. Its clients are mostly large companies.

What K. S. Aiyar & Co. offers

  • Audit and assurance: statutory and VAT audits, due diligence reviews and investigations.
  • Taxation: direct and indirect tax advice, transfer pricing and tax audit.
  • Advisory: governance and risk management, corporate restructuring, recovery and mergers, and valuation.
  • Regulatory and legal support: foreign exchange consulting, secretarial work and services for international investors.
  • Other services: US GAAP restatement, accounting support, recruitment help and advice to non-profit organisations.

Key facts

  • Founded: 1897, in Calicut
  • Based in: Mumbai, India
  • Network: independent member of LEA Global
  • Community work: supports education for children and local artists, through a foundation and a gallery at its premises

Summary written by TrustList from the business's own published information, Nov 2026.

Categories & features

K. S. Aiyar & Co. rankings

K. S. Aiyar & Co. is ranked on 6 TrustList rankings: #2 on 1, #4 on 1, #6 on 1, #9 on 1, #10 on 1 and #17 on 1.

Every ranking orders its listings by their reviews, how complete the profile is and the Trust Score. K. S. Aiyar & Co. has no reviews yet and 3 of the 10 profile details we look for. Where no listing on a page has been reviewed, the order follows the profiles alone.

Accounting firm · 6 rankings

  • #2of 23
    Mumbai

    It is the only one of the 23 here listing education and not for profit.

    Its profile: “Chartered accountants in Mumbai, K.”

    Of the 23 here, 11 also cover tax and 9 also cover accounting; 3 also work in Pune and 3 also work in Ahmedabad.

    Behind Dhirubhai Shah & Co LLP, ahead of Engineer & Mehta.

  • #4of 53
    Education

    It is one of 2 here listing personnel and progressive.

    Its profile: “Its foundation is a joint venture with a US counterpart that connects sponsors with rural village children living below the poverty line, and it supports education for underprivileged children and skills training for villagers.”

    Of the 53 here, 18 also cover non profit and 18 also cover government; 5 also work in United States and 5 also work in California.

    Behind Arkansas Foundation, ahead of Heveron & Company CPAs.

  • #6of 144
    Legal

    It is one of 3 here listing rendering and one of 44 here listing accounting.

    Its profile: “It also provides legal and secretarial services, US GAAP restatement and general accounting support, and it lists personnel recruitment and management consulting among its other work.”

    Of the top 84 here, 14 also cover insurance and 14 also cover reporting; 3 also work in Dubai and 3 also work in Pennsylvania.

    Behind Informes Contables.

  • #9of 137
    India

    It is one of 17 here listing legal and one of 50 here listing tax.

    Its profile: “says it is the oldest accounting firm in India, tracing its start to Calicut in 1897 and its move to Mumbai in 1900.”

    Of the top 85 here, 18 also cover auditing and 17 also cover legal; 12 also work in Delhi and 7 also work in Mumbai.

    Behind D.P. Shewale & Co., ahead of KK Thampan & Co..

  • #10of 13
    Personnel

    It is the only one of the 13 here listing not for profit and progressive.

    Its profile: “It also provides legal and secretarial services, US GAAP restatement and general accounting support, and it lists personnel recruitment and management consulting among its other work.”

    Of the 13 here, 10 also cover partners and 8 also cover medical; 2 also work in New Delhi and 2 also work in Texas.

    Behind Ilaka Solutions LLC, ahead of Lisa L. McDonall CPA.

  • #17of 24
    Rendering

    It is the only one of the 24 here listing progressive and one of 3 here listing education.

    Of the 24 here, 4 also cover internet; 2 also work in Chennai and 2 also work in Hyderabad.

    Behind JVR & Associates, ahead of Khan Akber & Co. Chartered Accountants.

As of 2026-11-15. Organic ranks only; sponsored placements are never ranks. How TrustList ranks

What the business tells TrustList

Founded
1897 (129 years) evidence sent

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