Why the converted figure has to be certified, not just calculated
Currency conversion looks trivial — multiply by a rate — but for an official recipient the entire question is which rate, taken when, and on whose authority. A figure you convert yourself on a phone app can be queried because the rate moves daily and the recipient has no way to know you did not pick a flattering day. That uncertainty is what a certificate removes.
A chartered accountant's converted statement fixes three things the recipient cares about: the rupee figure it started from (tied to your return or statements), the exact rate applied and where that rate comes from, and the date the rate was taken. With those stated and a UDIN attached, the foreign-currency number stops being an estimate and becomes a figure a regulated professional stands behind.
The 18-digit UDIN is what carries it across the border. The foreign bank, tax office or consulate can check it on ICAI's public portal and confirm the statement is genuine — which is why a CA-certified conversion is accepted where a self-converted one is sent back.
Which exchange rate the statement uses
There is no single "correct" rate for every purpose — the right one depends partly on what the recipient specifies and partly on what Indian rules require for the kind of figure being converted. The certificate makes the choice explicit rather than leaving it implied.
| Basis | When it is used |
|---|---|
| SBI TT buying rate | The statutory Indian basis for converting income (Rule 115) |
| RBI reference rate | A published rate some foreign banks / authorities ask for |
| Recipient-specified rate | Where the consulate or bank names the rate or date to use |
For income figures, the Income-tax Rules point to the State Bank of India telegraphic-transfer (TT) buying rate (Rule 115), which is the basis used when the same income is reported under Indian tax law — so an income conversion usually rests on that. For a balance or net-worth snapshot going to a foreign bank or consulate, the recipient may instead specify the RBI reference rate or a rate on a particular date. The CA applies the rate the situation calls for and states it on the face of the certificate, so the recipient can see exactly how the number was reached and reproduce it if they wish.
What gets converted, and what stays anchored to the rupee record
The certificate converts the figure into the foreign currency, but it never floats free of the Indian record behind it. Whatever is being shown — a year's income, a set of account balances, the value of assets, or a full net-worth figure — the rupee amount is what ties back to your filed return, your bank and demat statements, or the underlying valuations. The conversion sits on top of that.
That layering matters because the recipient often needs both: the foreign-currency number to read against their own threshold or form, and the assurance that it derives from a real, traceable rupee figure rather than a number invented at the converted value. So the statement typically shows the rupee figure, the rate and date, and the foreign-currency result side by side, leaving an auditable line from the Indian record to the converted total.
Where the conversion supports something larger — a net-worth certificate for a visa, an income certificate for a mortgage, or a tax-paid certificate for a credit claim — the converted statement is built to sit alongside that document so the figures are consistent across the whole application.
A worked example: an NRI showing Indian savings to a Dubai bank
Arjun, an NRI in Dubai, is opening a premium banking relationship and the bank has asked him to evidence his Indian savings in dirhams, certified by an accountant. His balances sit across an NRO savings account, two fixed deposits and a mutual fund holding — all in rupees — and the bank's form wants a single AED figure it can read against its own threshold, with the rate shown.
A chartered accountant takes Arjun's bank and FD statements and his mutual fund valuation as on the date the bank specified, totals the rupee figure, and applies the exchange rate the bank named for that date. The certificate lists each component in rupees, states the rate and its source and the date it was taken, and shows the converted dirham total, with the rupee amounts tying back to the statements. It goes out on letterhead with an 18-digit UDIN.
The bank verifies the UDIN on ICAI's portal, sees a dirham figure it can use directly and a rupee trail behind it, and accepts the statement without asking Arjun to redo the conversion. Exactly which rate and date a given recipient wants varies — some name a rate, some leave it to the accountant's stated basis — so the certificate is built around the recipient's instruction rather than a fixed template.