How to Compare Supplier Quotes in Different Currencies

International sourcing means the quotes on your desk rarely share a currency: the local vendor bids in EGP or AED, the European OEM in EUR, the trader in USD. Compare them raw and you will crown the wrong "lowest bidder" — the most expensive mistake in multi-currency procurement, and one of the easiest to avoid.

Step 1 — Pick one reporting currency

Usually your accounting or project currency. Every number on the comparison sheet — unit rates, totals, tax, savings — gets expressed in it. Vendors' original currencies stay visible as a label per vendor ("quoted in USD"), never as unconverted numbers mixed into the same column.

Step 2 — Which exchange rate should you use, and from what date?

• One rate per currency pair, one date for all vendors. Converting Vendor A at Monday's rate and Vendor B at Thursday's silently reshuffles the ranking.
• Use a citable reference — central-bank fixing or a market mid-rate — not whatever a search engine showed that morning.
• Record "1 EUR = 1.0800 USD, as of 14 Jul 2026" on the sheet itself. When the award is reviewed months later, the comparison must be reproducible.

Step 3 — Convert at line level, then total

Convert each vendor's unit rates, then recompute totals as unit rate × your master quantity. Don't convert only the grand total: line-level conversion lets you compare unit prices across vendors item by item — where the real negotiation leverage is — and catches vendors whose "total" doesn't match their own lines.

Step 4 — Do you convert before or after tax?

Apply each vendor's VAT/tax rate after conversion, on the converted ex-tax subtotal, and compare all vendors on the same basis (ex-tax for ranking, tax-inclusive for cash flow). Two classic errors:

• Comparing one vendor's tax-inclusive total against another's ex-tax total — flatters the ex-tax bid by the whole tax rate.
• Converting a tax-inclusive total and then adding tax again — double-counts it.

Step 5 — Treat currency as a risk, not just a number

Conversion answers "who is cheapest today." Between award and final payment the rate will move — and someone bears that. Add an FX risk row to your risk analysis:

Mitigations to note in the recommendation: shorter validity, negotiating the contract in your currency, aligning advance payments with favourable rates, or a contractual fixed rate.

How to automate a multi-currency comparison

NazmIQ (nazmiq.com) detects each quote's currency from the document, converts everything to your reporting currency at a single documented rate, applies each vendor's tax after conversion, and prints the exchange rates used on the report and the Excel export — so the comparison is reproducible by anyone who opens it.

Frequently asked questions