Interactive Brokers tax report in Finland (2026)

General information, not tax advice. Verify your own situation or consult a professional.

Interactive Brokers is a foreign broker and does not send data to the Finnish Tax Administration for your pre-completed return. In practice the full reporting burden is on you: every sale, dividend and fee must be reported yourself in MyTax (OmaVero) with correct euro amounts. This guide walks through what to report and how to calculate it correctly.

What you must report

As an IB investor you report every item realised during the tax year. These fall into four groups:

• Capital gains and losses — the result from selling shares, ETFs and derivatives. A gain is taxable capital income; a loss is deductible.
• Dividends — foreign dividends are reported gross, with withholding tax accounted for separately.
• Interest income — for example on cash balances or lent-out shares.
• Trading fees — commissions and other direct costs are added to the acquisition cost or deducted from the sale price.

More on dividends on the page about dividend taxation in Finland, and on derivative specifics in taxation of options and derivatives.

Converting currencies to EUR

On an IB account trades are often in dollars or other currencies, but the tax return is always in euros. The purchase price is converted to euros at the rate of the acquisition date and the sale price at the rate of the trade date: that is what the Tax Administration guidance Omaisuuden luovutusvoitot ja -tappiot luonnollisen henkilön tuloverotuksessa (section 8.11, in Finnish) says, and its section 5.2 names the official European Central Bank (ECB) rate of the day the contract is signed as the conversion rate. The older securities guidance (section 2.2) refers to the day the sale price was received — the difference is usually one day. A worked example with a calculator: Why am I up in dollars but down in euros? This means the same trade can produce a euro-denominated gain even if the result in the trading currency is exactly zero, if the rate moved between buy and sell.

Acquisition cost and the FIFO principle

When you have bought the same share in several lots and sell part of it, you must decide which lot is deemed sold. Finland applies the FIFO principle (first in, first out): the oldest holding is sold first. The acquisition cost includes the purchase price and the buy commission, both converted to euros at the rate on the day of purchase. Tracking FIFO by hand is laborious when there are dozens of lots. The FIFO rule is laid down for book-entry securities (Arvopaperien luovutusten verotus, section 23.3, in Finnish); the purchase commission is part of the acquisition cost (section 4.2.1).

Worked example

Here is a concrete example. You bought 10 shares at 100 $ each when EUR/USD was 1.10. The acquisition cost is 1,000 $ ÷ 1.10 = 909.09 € (excluding commissions). You later sell the same lot at 120 $ each when EUR/USD was 1.05. The sale price is 1,200 $ ÷ 1.05 = 1,142.86 €. The capital gain is 1,142.86 − 909.09 = 233.77 €, reported as capital income. Note that in dollars the gain was 200 $, but in euros it differs because of the FX move — this is exactly where most manual-calculation errors come from.

Flex Query import and why there are many rows

IB's Flex Query is a report you can configure to include all executed trades, dividends and fees in a machine-readable format. PnlTrack imports it automatically. One thing often surprises people: a single order may appear as many rows. This is entirely normal — a large order is often filled in pieces (partial fills) at different prices and even different seconds. The software correctly merges these partial fills into one trade for the calculation, so you do not need to worry about the row count.

Setting up the query step by step — sections, Models and the token — is covered in the guide How do I set up a Flex Query at Interactive Brokers?

The deemed acquisition cost and the 1,000 € exemption

Instead of the actual acquisition cost you may deduct the deemed acquisition cost: 40% of the sale price for holdings owned at least 10 years and 20% for shorter holdings. Pick whichever option gives the smaller taxable gain. In addition, if the combined sale price of all disposals during the tax year is 1,000 € or less, the gains are tax-free and need not be reported. More on losses on the page about deducting capital losses.

MyTax and deadlines

Capital gains are reported in MyTax under Capital gains and losses. The pre-completed return arrives in spring and there is an annual deadline for supplementing it — check your own date in MyTax. In practice you need to gather, for each sale, the acquisition price, sale price, dates and fees in euros. You can estimate the tax in advance with the capital gains tax calculator.

How PnlTrack does it for you

• Imports your full IB history automatically via Flex Query and merges partial fills correctly
• Calculates acquisition costs on the FIFO principle and converts currencies at ECB daily rates
• Suggests the cheaper option between actual cost and the deemed acquisition cost
• Handles dividends, withholding tax and derivatives in the same view
• Produces ready tax-report figures in one click

A week of March work shrinks to a few minutes, and the risk of calculation errors drops substantially.

General information, not tax advice. Verify your own situation or consult a professional.