How NDFs Let You Hedge Restricted Currencies Without Delivering Them

Imagine you run a small importing business and need to pay a supplier in a country whose currency cannot easily leave that country. You cannot open an offshore account in that currency, and converting it outside the country is restricted. Yet you still want to know today what your future payment will cost. This is exactly the problem a non-deliverable forward, or NDF, is designed to solve.

What makes a currency "non-deliverable"?

A currency is non-deliverable when it is hard to trade freely outside its home market. This can happen because of government restrictions or simply because there is no active international market for it. Inside the country, the currency may be perfectly usable; the restrictions usually apply to moving it offshore or delivering it abroad. That is why NDFs exist. They let companies and investors hedge exposure to currencies such as the Brazilian real, Indian rupee, Korean won, Chinese renminbi, Russian rouble or New Taiwan dollar—without ever having to receive the currency itself.

How do they work? In a standard forward contract, two parties agree to exchange currencies at a future date. With an NDF, they agree on a future exchange rate, but at the end they never hand over the currencies. Instead, they compare two rates and settle the difference in cash. The notional amount—the reference size of the contract—forms the basis of the calculation but is never exchanged. Think of it as settling the score without dragging in a suitcase full of banknotes.

Quotation: agreeing on a future rate

An NDF starts with a quote, much like any currency forward. You agree on the notional amount, the maturity date, and a fixed forward rate for the pair, say the US dollar against the Brazilian real. Because the contract is customised, the amount and maturity can be tailored to a business's needs. The quote locks in a rate, so a company can plan its budget even if the market moves later.

One thing to keep in mind: every currency pair has its own market conventions. Industry bodies publish template terms for specific pairs, from the Argentine peso to the Vietnamese dong. These templates act like a shared rulebook, defining how quotes, fixing and settlement will behave for that particular currency.

Fixing: the official rate appears

A few days before settlement, the contract reaches its fixing date. On that day, the parties look up the "fixing rate" for the currency. This is usually the daily rate published by the country's central bank, or an average rate contributed by several banks. It is not an invented number; it is a transparent reference point that both sides have agreed to use in advance.

This step is crucial because it determines who owes what. The contract rate agreed at quotation is compared with the fixing rate. If the fixing rate has moved in one party's favour, the other party pays the difference. If it moved the other way, the payment flows in reverse. The result is a single cash payment for one party's profit—no physical delivery, no exchange of the restricted currency.

Settlement: only the difference moves

Settlement is the payoff moment. The difference between the contracted rate and the fixing rate is multiplied by the notional amount, and the resulting amount is paid in a fully convertible currency—usually US dollars, but sometimes euros, pounds or Swiss francs. This is why NDFs are described as cash-settled. You can be exposed to the Indian rupee, for example, while every actual payment you make or receive is in dollars.

For companies, this is useful when they need to hedge a balance-sheet exposure but do not have an actual payment in the restricted currency. For investors and banks, NDFs provide a way to take a view on a currency that is difficult to access directly. In some emerging-market currencies, NDFs make up a large share of offshore trading—more than 40% of offshore trades in the real, rupee, won and New Taiwan dollar, according to central-bank surveys. Global NDF turnover reached $134 billion in April 2016, growing even while several of the underlying currencies were falling against the dollar.

Why the market keeps growing

NDFs have become an important tool for hedging and speculation in currencies where the onshore market is off-limits to outsiders. Their popularity is not uniform, though. The Korean won NDF, for instance, has flourished because restrictions limit non-residents' access to onshore forwards. The Chinese renminbi went the opposite way: as the currency became more international, deliverable forwards offshore displaced much of the old NDF market. The Russian rouble sits somewhere in between.

This diversity is a useful reminder that "restricted currency" is not a fixed category. A currency's restrictions can loosen or tighten over time, and the NDF market adapts accordingly. Global surveys show that NDFs still represent roughly a fifth of outright forward trading worldwide.

The honest fine print

NDFs are not risk-free. If the fixing rate moves against you, you may be required to pay the difference. If the spot market moves unfavourably before settlement, you may receive a margin call—a request to put up more cash as collateral. If the currency moves in your favour after you sign the contract, you do not benefit from that opportunity. There may also be costs if you want to cancel or amend the contract.

This article is here to build understanding, not to tell you what to buy or sell. The exact fixing source, the settlement currency, and even the definition of a disruption event depend on the currency pair, the contract documentation and the jurisdiction. In other words, the details matter, and they should always be checked with a qualified professional.

A rulebook catching up with the market

For years, NDFs were documented under the 1998 FX and Currency Option Definitions, supplemented by separate template terms for each currency. That system is being modernised. ISDA and EMTA have published the 2026 FX Definitions, which consolidate the template terms and other market practices into one digital document and remove the need for separate master confirmation agreements. The new definitions are scheduled to replace the old ones on 22 November 2027. For a market that grew up quietly on the edges of global finance, that is a sign of how mainstream it has become.

At its core, the NDF story is simple. When a currency cannot be delivered, the market settles the idea of the currency instead—quoting it, fixing it, and paying the difference in a currency that can actually move across borders.