Currency and exchange-rate assumptions should be written as explicit terms in the quote, rather than left to an implied convention. Name the applicable currency and, if conversion is involved, record the rate source, date, calculation, and conditions for changing the rate. The cited pro forma invoice guidance does not prescribe these fields, so the following is a practical documentation checklist rather than an official currency or exchange-rate rule.
State each currency clearly
Identify the currency attached to each quoted item and separately priced charge. If the quote currency differs from the payment currency, name both and explain which amount the exchange rate converts.
Avoid phrases such as “at the prevailing exchange rate” unless the quote also explains how that rate will be determined and applied.
The U.S. International Trade Administration states that a pro forma invoice should identify the buyer’s reference and the items quoted. A currency field should therefore appear alongside those existing identifiers, not replace them.
Make the exchange-rate assumption reproducible
When a conversion is used, the quote should state:
- The source from which the exchange rate is obtained
- The currency pair and conversion direction
- The date and time used to observe the rate
- The calculation and any stated rounding treatment
- Whether the rate is fixed or subject to revision
- The event or condition that would trigger a revised rate
A rate shown without its source, date, and calculation may not allow the reader to reproduce the quoted amount. The cited guidance does not designate a particular rate source, observation date, or conversion method, so those choices must be presented as agreed commercial terms rather than attributed requirements.
Keep changes under control
The U.S. International Trade Administration says changes to future-shipment details should not be made without the buyer’s consent. A revised currency or exchange-rate basis should likewise be shown as a proposed change, rather than silently replacing the accepted quote.
Extending that consent process to exchange-rate changes is a commercial drafting choice. It should not be presented as wording supplied or mandated by the agency.
Example commercial wording
The following is a drafting template, not source or legal language:
Buyer’s reference: [reference]. Items quoted: [items]. Quote currency: [currency]. Payment currency, if different: [currency]. Conversion basis: [rate source], [currency pair], observed on [date and time], applied using [calculation]. Rate treatment: [fixed until the stated condition / revised under the stated condition]. Any change to the pricing basis or to future-shipment details is subject to buyer consent before implementation.
What the reader must still confirm
The cited guidance does not resolve which currency must be used, which exchange-rate source is acceptable, when the rate should be observed, whether it should remain fixed, or how market movements affect the amount. It also does not establish that an exchange-rate change legally counts as a change to future-shipment details.
Buyers should therefore confirm the currency, rate source, timing, calculation, revision triggers, and approval process with the other contracting party. Any additional legal, regulatory, tax, or payment requirements must be checked against the applicable official materials rather than inferred from the pro forma invoice guidance cited here.