What are exchange controls?
Exchange controls are rules set by a government or central bank that limit who may buy, hold or move foreign currency, how much, and for what purpose. They decide whether a company can keep the dollars it earns, how fast it must convert them, and what paperwork it needs to pay a supplier abroad. Example (round numbers): a South African exporter ships goods worth 100,000 dollars on 1 March. It must receive the proceeds by 1 September, then within 30 days sell them to its bank for rand or keep them in a customer foreign currency (CFC) account.
- Exchange controls govern who may hold foreign currency, when export earnings must come home, and what documents an import payment needs.
- South Africa requires export proceeds within six months of shipment and their sale within 30 days, unless retained in a CFC account.
- Argentina requires service export proceeds to be brought in and settled for pesos within 20 business days of receipt, under BCRA Communication A 8481.
- Mexico lets banks take US dollar demand deposits from any company domiciled in Mexico, but from individuals only in the northern border strip and Baja California.
- An account abroad does not switch off home rules; South Africa, for example, bars keeping foreign currency abroad without approval.
How exchange controls work
Controls take a few common forms. Some limit who may hold foreign currency at home. Some require exporters to bring earnings back and sell them for local currency. Others require registration before an import can be paid, or force unused balances to be converted. The table gives one example of each from a central bank or regulator's own rules.
| Type of control | Example | Rule |
|---|---|---|
| Who may hold dollars | Mexico | Companies domiciled in Mexico may hold US dollar demand deposits; individuals only within 20 km of the northern border or in Baja California and Baja California Sur (Banxico Circular 3/2012, Article 46) |
| Repatriation and sale | South Africa | Export proceeds within six months of shipment; sell to an authorized dealer within 30 days or retain in a CFC account (SARB guidelines, section 7.1) |
| Settlement for local currency | Argentina | Service export proceeds brought in and settled for pesos within 20 business days (BCRA A 8481) |
| Conversion of balances | India | Unused EEFC balances converted to rupees by the end of the following month (RBI Master Direction) |
| Registration before paying imports | Nigeria | A Form M records the import, its value and supplier with the bank before the goods ship |
Sources: Banxico Circular 3/2012; SARB; BCRA A 8481; RBI; FirstBank Nigeria. Summary, not legal advice. As published on 29 October 2026.
Where a business meets them
- Exporters meet deadlines for bringing earnings home and, in some countries, for selling them; see export proceeds repatriation.
- Importers meet document checks before their bank releases foreign currency, such as Nigeria's Form M, and payment codes that state the purpose of each transfer (purpose codes).
- Companies holding dollars abroad meet rules on foreign accounts; South Africa's guidelines do not allow keeping foreign currency abroad without specific approval unless the Authorized Dealer Manual provides for it.
- Stablecoin users meet the same rules, since a token received for an export is still export income; see stablecoin rules by country.
Common mistakes
- Assuming an account abroad avoids the rules. The rules follow the company and where it is resident, not where the account is.
- Counting from the wrong date. Deadlines usually run from shipment or invoice, not from when the buyer pays.
- Relying on old summaries. India cut its export realization period from fifteen months to nine from 1 October 2026; guides written before then are out of date.
- Leaving out references. Quote registration numbers, such as the Form M number, in the payment reference so the bank can match the payment.
Related terms and how Helm handles it
A Helm account does not change the exchange controls of the company's home country; confirm with your local bank or adviser how they treat an account held abroad. Helm does not serve every country, and USD account details are not available to companies based in some countries; see eligibility.
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What are exchange controls in simple terms?
They are rules that limit how people and companies buy, hold and move foreign currency. Common examples are limits on holding dollars, deadlines for bringing export earnings home and paperwork before paying for imports.
Which countries have exchange controls?
Many do, in different forms. Argentina, Nigeria, South Africa, India and Bangladesh all set deadlines or conditions for export proceeds, and Mexico limits which individuals may hold dollar accounts at Mexican banks.
Does a foreign bank account avoid exchange controls?
No. The rules apply to the resident company wherever its money sits. South Africa's guidelines, for example, do not allow keeping foreign currency abroad without specific approval unless the Authorized Dealer Manual provides for it.
Do exchange controls apply to stablecoins?
Usually the underlying rules still apply, because export income received as tokens is still export income. Several countries also have specific rules on crypto payments, so check the position before accepting them.
References
- Banco de México: Circular 3/2012 (Articles 46 to 48)
- South African Reserve Bank: Currency and Exchanges guidelines for business entities (version of 28 October 2025)
- Banco Central de la República Argentina: Communication A 8481, Exterior y Cambios (14 September 2026)
- Reserve Bank of India: Master Direction, foreign currency accounts by a person resident in India
- Reserve Bank of India: Notification FEMA 23(R)/(1)/2026-RB (22 September 2026)
- FirstBank Nigeria: Forms A, M and Q
This guide is general information for businesses, not financial, legal or tax advice. Rules, fees and timings were checked against the sources listed on the review date and may change.