The most dangerous currency risk in a trading business does not live on any FX dashboard — it lives inside ordinary invoices. The purchase order signed in January at 15.0 to the dollar and payable in April at whatever-the-rate-is-then is an open currency position, taken implicitly, sized at the full invoice value.
This guide shows how to see the exposure on each invoice, what it costs in expectation, and the three mechanical ways to close it — plus the invoicing-side version for exporters, where the same risk wears the opposite sign.
Seeing the exposure on a single invoice
Take a concrete case: goods priced at USD 100,000, 30% deposit at order, 70% balance at shipment in 90 days, revenue in cedis. The deposit converts now — no exposure. The USD 70,000 balance is exposure: for 90 days, every 1% move in USD/GHS moves your cost by GHS-equivalent 1% of 70,000. If the cedi weakens 8% across the window — well within historical ranges — the goods cost 5.6% more than the total you priced, which for many import categories is the entire net margin.
The exposure formula per invoice is simply: unpaid foreign-currency amount × days to settlement × volatility of the pair. You do not need the statistics to act on it — the unpaid amount and date are enough to size the hedge.
Three mechanical fixes
Every invoice exposure has three closes, and choosing is a cash-and-cost decision rather than a market one.
- Lock at commitment. Fix the executable rate for the full invoice (deposit and balance) the day the order is agreed. Where the provider supports staged locks, each tranche settles at the locked rate on its date. Cost: the lock spread. Benefit: the priced margin is sealed.
- Forward the balance. For larger dated balances, a forward contract fixes the rate for the settlement date, usually against a margin deposit. Slightly more formality, well suited to seasonal or contractual order books.
- Fund early from held balances. If you hold hard-currency balances (from collections or planned block conversions), allocate the payable now — the exposure transfers from the invoice to a balance you already own and manage. Zero instrument, maximum use of a multi-currency structure.
The exporter’s mirror image
Exporters and service businesses carry the same exposure reversed: a EUR or USD invoice issued today and collected in 60 days is a long position in the foreign currency. If the home currency strengthens before collection, the invoice shrinks in local terms. The same three fixes apply — lock the conversion rate at invoicing, forward the expected receipt, or leave receipts in-currency and net them against foreign-currency costs (often the best answer, since it also saves the spread).
The invoicing currency itself is a lever: pricing in your customer’s currency wins deals but transfers the exposure to you — price that risk in, or hedge it at issuance. Pricing in your own currency exports the risk to the customer, which costs competitiveness. There is no free option; there is only choosing consciously.
Making it a process, not a decision
The failure mode is treating each invoice as a fresh judgment call — busy weeks pass, exposures drift, and the market decides your margins. The fix is a threshold rule executed without opinion: any foreign-currency commitment above the threshold is locked, forwarded or funded within 48 hours of signature; smaller ones settle spot with locked quotes. Log each exposure and its close in the exposure table; review weekly alongside the cash forecast.
Measured over a year, this one process typically does more for margin stability than any pricing initiative — because it stops giving margin away to a market you never intended to trade.
Key terms
Invoice FX exposure
The currency risk on the unpaid foreign-currency portion of an invoice between commitment and settlement.
Commitment point
The moment a price is commercially fixed — the correct trigger for closing the FX leg.
Staged rate lock
Locked rates applied per payment tranche (deposit, balance) of the same order.
Long / short position
Benefiting when a currency rises (long) or falls (short) — importers are implicitly short the invoice currency; exporters long.
Threshold rule
A policy line above which every exposure is closed mechanically within a set time of commitment.
Exposure table
The running inventory of open foreign-currency commitments, amounts, dates and hedge status.
Frequently asked questions
My supplier gives 90-day terms — isn’t that a benefit?
It is a financing benefit and an FX exposure simultaneously. Take the terms and close the currency leg — lock or forward the balance at commitment — so the financing benefit survives whatever the market does in the window.
Is locking every invoice overkill for a small importer?
Set a materiality threshold: exposures that could dent margins noticeably get closed mechanically; smaller ones settle spot with locked quotes at payment. The discipline scales down gracefully — the point is that the rule, not the mood, decides.
What does closing an exposure cost?
The spread on the locked or forward rate, and deposit capital for forwards. Weigh it against the alternative: an uncapped downside sized at the full invoice value. Insurance pricing looks cheap next to one bad quarter of depreciation.
We invoice customers in USD — are we exposed too?
Yes, in reverse: until collection, you hold a long-USD position against your home currency. Lock at invoicing, forward expected receipts, or — often best — hold receipts in USD and net them against USD payables.
Where do I start this week?
List every open foreign-currency commitment with amount and settlement date. That table is your exposure. Close everything above a threshold you choose, and adopt the 48-hour rule for new commitments from today.
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