Polymer Notes · Currency Reform
The News
India weighs a switch to plastic money
The Reserve Bank, it is reported, is studying a move to polymer (plastic) banknotes — and its Annual Report has flagged a phased rollout of notes with upgraded security features from the middle of 2026. A note is rebuilt from the substrate up only once in a long while. That is precisely why this is worth a letter.
Times of India · 5 June 2026
Will India finally get plastic banknotes? RBI's polymer currency plan explained
Any feature that must live inside a note — rather than be printed on its surface — has to be designed in at this stage, or wait another decade. So I wrote to the Governor.
The Letter
Polymer Banknotes — A "Once-in-a-Decade" Opportunity to Inoculate the ₹500 Note
Respected Shri Malhotraji,
First, my warm congratulations on the RBI's move to explore
polymer banknotes. This is genuinely a "once-in-a-decade"
reform — because a banknote is re-engineered from the
substrate up only rarely, and any feature that must live inside
the note has to be designed in at exactly this stage.
I write to place before you one specific, low-cost addition this
redesign makes possible: embedding passive RFID into the
₹500 note, to curb bulk anonymous cash — the principal
instrument of black-money movement — without disturbing
the honest citizen's wallet.
The idea is simple to state: do not eliminate the high-
denomination note — inoculate it. Give the ₹500 note a
"vaccine" of passive RFID, so that bulk cash becomes
detectable at the choke-points that matter (currency chests,
bank counters, sub-registrar and bullion points), while an
individual's wallet stays invisible.
Four birds with one stone
Why the simplicity matters. When I first proposed
embedding sensors in high-denomination notes, around the
2016 demonetisation, the obstacle was power — an active tag
needed a battery. That obstacle is now gone, because the
mature approach needs no battery at all.
The method is chipless, passive RFID: resonant structures
printed in conductive ink directly into the note — no chip, no
battery, no assembly step. Energised by a reader, each note
reflects a unique signature, cryptographically bound to its
serial number. In manufacturing terms, this is little more than
an extra ink pass. And critically, the polymer substrate makes
it easier, not harder — such structures laminate cleanly into
film.
The salient aspects — choke-point reading rather than
ambient tracking, threshold logic that flags volume above a
statutory limit, encrypted serial-bound signatures, very short
read range, and an aggregate-first, privacy-by-design
architecture — are set out in fuller detail in my note,
Vaccine for the ₹500 Currency Note.
A World First for India
To the best of available knowledge, no country has yet embedded RFID into its circulating banknotes. The European Central Bank explored it around 2001 (targeting euro notes by 2005), and Japan reportedly studied it — but neither proceeded, on cost grounds and with then-current chip-based designs. The chipless, ink-based approach proposed here did not exist at that scale then. This is an opportunity for India to set a global benchmark — the first nation to spare no effort in ridding itself of the cancer of corruption, using a feature no central bank in the world has yet deployed.
What I respectfully urge:
- That the RBI evaluate chipless passive RFID as a
- security feature within the polymer programme.
- That it authorise a closed field trial on a limited ₹500
- print run — exactly as was done for varnished notes —
- testing read reliability, clone-resistance, durability and
- reader cost.
- That it adopt a published privacy-by-design
- specification before any wider issue.
I keep the statistics deliberately brief — you and your
colleagues command far better data than I could offer. I
would be honoured to present the technical and privacy-
design detail to the relevant departments at your convenience.
With deep respect, and in service of Viksit Bharat — 2047,
Hemen Parekh
Mumbai
The Provenance
An argument built over a decade
This is not a new thought dressed for the day's headline. The case has
been assembled across years of writing:
— The full proposal, with the privacy architecture spelled out: A Vaccine
for the ₹500 Currency Note (30 May 2026).
— The original idea of printing serial numbers with ink carrying nano-
scale RFID structures, first set down around the 2016 demonetisation,
and my collected notes on RFID in currency notes.
— The wider case on black money and the digital-cash transition, from A
Gordian Knot? through A Glimpse of the Digi-Dhan?
What was once blocked by the need for a battery is, in 2026, blocked by
nothing but the decision to begin.
Where It Stands
The choice on the table
The mid-2026 redesign lets us keep the ₹500 note's convenience while
taking away the anonymity that makes it the instrument of choice for
black money — at the cost of an extra ink pass, and without a second
demonetisation.
The choice is not note or no note. It is anonymous note or accountable note.
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