1. Republic of India Coinage (1950–1957)
On 26th January 1950, India became a republic in the Commonwealth of Nations. To mark the beginning of a new era, a new coin series was introduced on 15th August 1950, symbolizing the independence of the nation. The British King's portrait was replaced by the Lion Capital of the Ashoka Pillar — representing India's sovereignty and rich cultural heritage. The one rupee coin was redesigned with a corn sheaf in place of the Tiger from the British era, symbolizing the nation's focus on progress and prosperity.
The new coinage still retained the previous monetary system with 1 Rupee divided into 16 Annas. However, the country was already moving towards a metric system for currency, which was a long-discussed reform.
2. Decimalization of Indian Coinage
The idea of decimalizing the currency was discussed for more than a century. India finally made the move when the Indian Coinage Act was amended in September 1955. The new system came into effect on 1st April 1957, replacing the old system of 16 Annas with 100 Paisa for 1 Rupee. The term Naya Paisa (New Paisa) was introduced to distinguish the new Paisa from the older system, and was used until June 1964 when the term 'Naya' was dropped.
3. Naya Paisa Series (1957–1963)
As part of the decimalization effort, the Naya Paisa coins were introduced in denominations of 1, 2, 5, 10, 25, and 50 paisa. These coins featured the term 'Naya Paisa' along with a Devanagari script legend explaining the value as a fraction of a rupee. The design included national symbols and was aimed at making the currency more accessible and recognizable.
4. Paisa Series I (1964 onwards)
In 1964, 'Naya' was removed from the Paisa denomination. The metal shifted to Aluminium — the first coin in this material was the 3 Paisa coin. Coins like 1 and 2 Paisa were also minted in Aluminium from 1965 onwards, and the 20 Paisa coin was introduced in 1968.
5. Paisa Series II (1965–1983)
The Devanagari legend was completely dropped, and coins continued to be minted in Aluminium. Small denomination coins (1, 2, and 3 Paisa) saw further changes, including the discontinuation of 1p and 2p coins by the early 1970s. The 20 Paisa coin was also phased out by the early 1970s.
6. Paisa Series III (1982 onwards)
Starting in 1982, the 20 Paisa coin was reintroduced and minted in Aluminium. The size and design of the 10 Paisa, 50 Paisa, and 1 Rupee coins were altered. The 3 Paisa coin was discontinued, and the 1 Paisa coin was gradually phased out. Costs of managing small-denomination notes prompted the government to consider coinizing higher denominations.
7. Paisa Series IV (1988 onwards)
Stainless steel was introduced for the 10, 25, and 50 Paisa coins. A new ₹1 coin was minted using stainless steel, and ₹2 and ₹5 coins were minted using Copper-Nickel. The discontinuation of ₹1, ₹2, and ₹5 notes led to the coinization of these denominations in the 1990s.
8. 2004 Unity in Diversity Series
In 2004, the Reserve Bank of India (RBI) issued the Unity in Diversity Series, which included coins in ₹1, ₹2, and ₹10 denominations. The ₹10 coin was the first bimetallic coin issued in India. Despite the new series, many of them never entered circulation and were hoarded by collectors.
9. 2007 Hasta Mudra Series
In 2007, the RBI issued the Hasta Mudra Series featuring hand gestures from Indian classical dance forms — in denominations of 50 Paisa, ₹1, and ₹2. The ₹5 coin featured waves. These coins were made of stainless steel. In 2008, the ₹10 coin design changed, while the ₹5 coin reverted to its previous design, albeit in Nickel-brass instead of Copper-nickel.
10. 2011 Series with the Rupee Symbol (₹)
In 2011, a new series was launched featuring the Rupee symbol (₹) prominently on the coins — in denominations of 50 Paisa, ₹1, ₹2, ₹5, and ₹10. The ₹10 coin continued to be minted in bimetallic form.
11. 2019 Grain Series
In 2019, a new series was introduced to make coins more accessible to people with visual impairments — in denominations of ₹1, ₹2, ₹5, ₹10, and ₹20, with increasing size and weight from lower to higher denominations. The ₹20 coin was introduced as a 12-sided coin without serrations. This series was launched by Prime Minister Narendra Modi and Finance Minister Arun Jaitley.
12. 2022 – 75th Year of Independence
The definitive coin series were launched as part of the Azadi Ka Amrit Mahotsav initiative, commemorating 75 years of India's independence. These coins were released as special issues but are not categorized as commemorative coins — a classification clarified by the Mumbai Mint in response to an RTI query dated 16-Nov-2022. The initiative pays tribute to citizens who contributed to the nation's development and is aligned with Prime Minister Modi's vision of 'India 2.0', a forward-looking, self-reliant nation powered by the ethos of Atmanirbhar Bharat.