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Interactive Brokers tax in Ireland: what goes on Form 11

Updated: 21/10/2026

Where IBKR share gains, EU ETF exit tax, US dividends and cash interest go on your Irish Form 11, with a worked euro example and the mistakes Revenue spots.

Interactive Brokers does not deduct any Irish tax, so you self-assess everything. Share gains fall under Capital Gains Tax at 33%, most EU-domiciled ETFs fall under the separate exit-tax regime (41% for 2025), and dividends and interest are taxed as income — all of it declared on Form 11 through ROS.

You are a chargeable person, and must file Form 11, when your non-PAYE income goes above Revenue's limits — broadly net non-PAYE income of more than €5,000, or gross non-PAYE income of more than €30,000. Dividends and interest from an IBKR account count as non-PAYE income. A PAYE employee with only small investment income can often declare it through myAccount and report share gains on Form CG1 instead.

Buying units in EU-domiciled funds generally makes you a chargeable person for that year as well, so most Irish ETF investors end up on Form 11 whatever their other income.

• Rate 33% on the net gain after the €1,270 annual personal exemption. The exemption belongs to each person and cannot be passed to a spouse.
• Each sale is matched against your oldest purchase of the same share first (first in, first out).
• Every purchase and sale is converted to euro at the exchange rate of its own date, so currency movements become part of your gain or loss.
• Broker commissions on buying and selling are allowable costs.
• Losses are set against gains of the same year first; anything left over carries forward with no time limit.

CGT is paid before the return, on 15 December and 31 January; Form 11 then reports the figures.

The UCITS ETFs most people hold at IBKR (ISINs starting IE or LU) are not taxed under CGT. Gains and distributions are taxed at 41% for 2025 and 38% from 1 January 2026, the €1,270 exemption does not apply, losses cannot be used against share gains, and every lot faces a deemed disposal eight years after purchase. These amounts go in the offshore funds part of the foreign income section and are paid with your Form 11 balance, not on the CGT payment dates.

Dividends from individual shares are income: income tax at 20% or 40%, plus USC and PRSI. With a W-8BEN on file, US dividends arrive with 15% withheld, which is credited against the Irish tax on that same dividend. Interest IBKR pays on your cash balance is foreign deposit interest, taxed at 33% when it is declared on a return filed on time.

1. Log in to the IBKR Client Portal and open Performance & Reports, then Statements.
2. Run an Annual Activity statement for 2025. Add earlier years if you bought shares before 2025, so each sale can be matched with its real purchase.
3. From the Trades section, list each sale with its date, proceeds and commission, and find the matching purchases. Convert both sides to euro at the rate for each date.
4. Separate shares from EU-domiciled funds using the ISIN and the instrument type.
5. Enter share disposals in the Capital Gains section of Form 11: number of disposals, total consideration, chargeable gains, losses and the exemption used.
6. Enter fund gains and distributions in the offshore funds section, then foreign dividends, the foreign tax withheld and deposit interest under foreign income.

Aoife bought 100 shares of a US company for $11,000 when €1 bought $1.10, a cost of €10,000 plus a €10 commission. In 2025 she sold them for $15,600 when €1 bought $1.20, which is €13,000, and paid another €10 commission.

• Gain: €13,000 − €10 − €10,000 − €10 = €2,980
• After the exemption: €2,980 − €1,270 = €1,710
• CGT at 33%: €1,710 × 0.33 = €564.30

She also received €800 of US dividends with €120 withheld. At the 40% rate, income tax is €320; after the €120 credit, €200 is left to pay, plus USC and PRSI on the €800.

• Copying IBKR's realised P/L. It is shown in dollars and follows the lot-matching method set in your account, not Irish FIFO in euro.
• Treating Irish-domiciled ETFs like shares: claiming the €1,270 exemption on them or offsetting their losses.
• Ignoring the four-week rule: if you sell at a loss and buy the same shares back within four weeks, that loss can only be used against a gain on those reacquired shares.
• Waiting until October to pay CGT, which by then is already late and building interest.

Form 11 for 2025 is due by 31 October 2026, with a later date in mid-November when you both file and pay through ROS. A late return adds a surcharge of 5% of the tax (capped at €12,695) if filed within two months, and 10% (capped at €63,485) after that. Unpaid tax carries interest of 0.0219% per day. Revenue also receives details of your account from IBKR under the Common Reporting Standard, so gaps are easy to spot.

A year of trades, currency conversions and fund rules is where expensive slips happen. Upload your IBKR statement to Brokers.tax and see each Form 11 figure in euro, split between CGT, exit tax and income, before the deadline closes in.