Every entrepreneur who works internationally must face exchange rate differences. Learn how to correctly account for them, the difference between balance sheet and tax methods, and how to handle foreign currency invoices and VAT.
What Are Exchange Rate Differences?
Exchange rate differences arise whenever a company operates in foreign currency. They're the difference between invoice value at issuance and its value in PLN on the accounting date. Example: a 1000 EUR invoice worth 4300 PLN on issue date might be worth 4320 PLN on payment date — that 20 PLN is the exchange difference, recorded as expense.
Types of Exchange Differences
- Realized differences — occur at actual payment or settlement
- Unrealized differences — from revaluation of foreign balance without actual payment
NBP Rate — Which Date Applies?
This is key for correct accounting. Polish law specifies exact dates for retrieving exchange rates.
For Sales Invoices (Revenue)
Use average NBP rate from day before invoice issuance. If invoice issued Tuesday, use Monday's rate. This rule comes from the Accounting Act and is mandatory.
For Purchase Invoices or Bank Account Transactions
Use: rate from day before invoice issuance (for consistency), or for bank transactions — rate from day before actual bank account operation.
Balance Sheet vs. Tax Method
This fundamental distinction affects your entire exchange accounting strategy.
Balance Sheet Method
All foreign currency operations are revalued on balance sheet date using current NBP rate. Includes both realized and unrealized differences. Each foreign balance (bank account, receivables, payables) is revalued at year-end.
Tax Method
Only realized differences (at actual payment) are tax differences. Unrealized differences (currency changes before payment) aren't taxable costs or income, so recorded on non-operational accounts.
Practical Consequences
| Aspect | Balance Sheet Method | Tax Method |
|---|---|---|
| Unrealized differences | Tax costs/income | No tax impact |
| Year-end revaluation | Mandatory | Optional (non-operational account) |
| Number of entries | More entries | Fewer entries |
| Tax impact | Larger | Smaller (only realized) |
Foreign Currency Invoice — Example
Scenario: Polish firm receives invoice from German supplier (EUR 2000) on April 15.
Example: German Supplier Invoice
VAT and Exchange Differences — Important Rule
Exchange differences on VAT amounts are NOT tax exchange differences. If a EUR 2000 invoice includes EUR 400 VAT:
- Net amount: EUR 1600
- VAT amount: EUR 400
- Calculate exchange differences ONLY on EUR 1600
- Ignore differences on VAT (tax-neutral)
Year-End Revaluation (December 31 Balance Sheet)
On balance sheet date, every foreign currency balance must be revalued at current NBP rate (December 30 rate).
Example: Revaluation of Foreign Currency Receivable
Year-End Settlement — Which Accounts to Use
Balance Sheet Method (All Differences Taxable)
- For costs: 761 — Other operating expenses
- For income: 751 — Other operating income
Tax Method (Only Realized Differences Taxable)
- For costs: 761 — Other operating expenses (only actual losses)
- For income: 751 — Other operating income (only actual gains)
- For unrealized: 290 — Transitional accounts (no tax impact)
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Tomasz Dąbrowski
Age: 52 years
Certification: Chartered Auditor
Education: Master's degree (Warsaw School of Economics)
Experience: 22 years in audit, accounting, and tax consulting
Tomasz specializes in complex accounting issues, including foreign currency operations, revaluations, and exchange differences. He's worked in leading audit firms and understands both balance sheet and tax methods from a practitioner's perspective.
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