Taxation on stock trades and dividends - Tax return

[ljkangas]

Experience: at least normal capital losses are deducted first, and only finally the interest on loans for the production of income. I don’t remember for sure if the deduction order was the same regarding losses from an equity savings account (OST), but I would assume so.

[Heitor]

@Paapaa

I have adopted a bit of a principle with IB: I report the information exactly as IB reports it. So, if there are errors in them, I report the information as erroneous, and if clarifications are requested, I provide the erroneous IB reports. In other words, I treat IB’s reports as the truth, even if they don’t fully meet the requirements of the Finnish Tax Administration. On average, the taxes still end up being correct; I’m not trying to profit a single cent from this, and I feel that the broker’s (erroneous) reporting should be enough for the tax authorities. Time will tell if this ever becomes an issue.

I compared IB’s displayed result to my own calculations based on the tax authorities’ instructions for one of my portfolios for the year 2025, and IB showed a profit of nearly 4,000 euros more. In one disposal, it even happened that the results were almost opposites of each other; one showed a profit, the other a loss of the same magnitude. But as you wrote, another year will yield a different result.

I read the IB result from the report Activity Statement/Realized & Unrealized Performance Summary/Realized.

[Avokado]

I personally whip up this report using IBKR data.

GitHub - oittaa/ibkr-report-parser: Interactive Brokers (IBKR) Report Parser for MyTax...

This year, I asked Claude’s largest model with the high effort setting to check the calculations made by the code. It found a few trivial findings and one major finding, but even that turned out to be a false alarm upon closer inspection.

Based on this, I have high confidence in those calculations. Of course, if the source data from IBKR is wrong, then there may be errors, but those cannot be fixed by any means.

[Heitor]

IBKR Report Parser calculates at least the results of stock trades in accordance with the requirements of the Finnish Tax Administration. In this regard, I get the same results with my own system, which is based on different source data, specifically flex report events. However, Report Parser does not take all events into account, so the taxable result may not necessarily be correct. I encountered this problem when my own calculations showed a significantly larger profit. The reason became clear: Report Parser did not acknowledge the redemptions of a certain stock in any way, and those redemptions do not even appear in the source data it uses.