How to track expenses in multiple currencies

1. Keep the amount and currency from the purchase

Start with the merchant, purchase date, amount, and original currency. Attach the receipt if you have one. A number alone is not enough: two purchases of “100” may represent very different amounts.

Use a currency code alongside the amount when a symbol could be ambiguous. Record the date of the purchase rather than the day you happen to upload the receipt. Add a category such as groceries, transport, accommodation, or dining so you can review similar expenses together.

2. Choose one currency for comparing your spending

Your comparison currency is the currency in which you normally think about your budget. It does not have to be the currency of your current location. Choose one for the period you are reviewing and use it consistently.

Keep the converted amount alongside the original; do not replace the original record. If you have not converted a purchase, keep it in a separate currency subtotal. Adding different currencies directly produces a total that is not meaningful.

3. Record how you arrived at the converted amount

For a planning estimate, note the exchange rate, its direction, source, and date. For reconciling a card purchase, use the amount actually posted to your statement in your account currency. Keep any separately charged fee visible as a separate entry.

Be careful with the direction of the rate. A rate expressed as home currency per purchase-currency unit is multiplied by the purchase amount. A rate expressed the other way around requires division. Labeling it prevents an easy mistake.

A current-rate view and a saved purchase-rate view can produce different totals. Decide which question you are answering: what the purchases cost when recorded, or what their original amounts equal at a later reference rate.

4. Count the purchase once

A receipt, a card notification, and a statement line may all describe the same expense. Check the merchant, date, and amount before creating another entry.

Similarly, recording a cash withdrawal as spending and then recording every cash purchase can count the same money twice. Keep transfers into a cash balance separate from the purchases made with that cash. Record a withdrawal fee separately if you are tracking it.

5. Review a little at a time

After a purchase, capture the essential details while they are easy to remember. During a regular review, check for missing currencies, duplicate entries, incorrect dates, and purchases that need a receipt or category.

Before comparing two totals, confirm that they cover the same dates, currency, conversion method, and treatment of future expenses. A monthly total that includes planned spending will not match a list of purchases made so far.

Your quick checklist

• Merchant and actual purchase date saved.
• Original amount and currency recorded.
• Receipt attached when available.
• Category chosen consistently.
• Converted amount labeled with its rate or statement source.
• Duplicates and future entries checked before comparing totals.

Using Mizerly for this routine

The Mizerly web beta lets you enter expenses, attach receipt photos, and review records. It keeps amounts in different currencies separate. The native iPhone app, still in development, includes work on original and home-currency views, receipt scanning, and translation.

See About Mizerly for the distinction between the web beta and the iPhone app, or visit Support if you need help with a record.