Key facts
- Card and operator exchange rates may differ from a published market exchange rate.
- Per-kWh price and total session price can diverge because of idle, time and start fees.
- Invoices and VAT treatment vary across jurisdictions and account types.
Quick answer: Do not compare two countries’ EV charging prices using the displayed kWh rate alone. Use the final amount actually charged, convert to the same currency using a declared rate, distinguish taxes and add-on fees, and divide by metered energy delivered.
What the receipt should tell you
A charging receipt can contain energy in kWh, the energy tariff, session or activation fees, time-based charges, parking/idle fees, taxes and a final amount. The roaming provider may bill in a different currency from the charge point operator. An exchange rate on a travel website is not necessarily the conversion rate your card issuer used.
Original three-stage comparison method
- Write down the total billed, currency, delivered kWh and whether the transaction is settled.
- Separate tax-exclusive unit price, taxes and other fees if the receipt provides them; do not invent the missing split.
- Convert both settled totals to one currency at a clearly identified rate and divide each by its own kWh. Compare total paid cost per kWh for that specific session.
Two hypothetical sessions
| Session A | Session B | |
|---|---|---|
| Energy | 20 kWh | 20 kWh |
| Energy charge | €8.00 | €10.00 |
| Other fees (tax included where applicable) | €3.00 | €0.00 |
| Total | €11.00 | €10.00 |
| Actual total / kWh | €0.55 | €0.50 |
All numbers are invented examples expressed in euros to isolate the calculation. Session A has a lower energy-only price yet a higher total cost. Real-world bills may allocate taxes differently.
Exchange-rate example
Suppose a hypothetical session costs 450 units of currency X and the card’s effective settled conversion is 30 currency-X units per euro. The settled conversion is €15. Another reference rate of 29.5 would imply roughly €15.25, but that is not the price the customer actually paid. A consistent comparison must name which rate it uses.
Document tax without giving tax advice
Value-added-tax obligations may depend on the charging location, consumer/business status and the supplier’s invoicing setup. Do not simply remove VAT from one session and retain VAT in another. EU consumer pricing information is outlined in Your Europe. Consult a local tax professional for business input-tax recovery.
When totals do not match the app
Check time-of-use windows and roaming billing. Save the settled receipt, charging station ID and payment reference. If necessary, follow our card hold guide, roaming guide and per-minute versus per-kWh calculator.
Frequently asked questions
Should I compare VAT-inclusive or exclusive prices?
For most private travellers, comparing what was actually paid is most useful. Business bookkeeping can require an additional tax breakdown.
Is the operator’s exchange rate guaranteed to match my bank?
No. Check the final settled card transaction and the currency-conversion terms.
This is a practical arithmetic guide, not a tax or payment-provider guarantee.
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