Not the 41% rate, a different bucket
Ireland taxes offshore funds by where the fund is based. Funds in the EU or European Economic Area, or in an OECD member country that Ireland has a treaty with, get a special regime: a 41% exit tax on gains, a deemed disposal every eight years, and no capital-gains reliefs. People assume all foreign funds land there.
Indian funds do not, and the reason is technical but decisive: that regime requires the fund's country to be an OECD member, and India, despite having a tax treaty with Ireland, is not an OECD member. So Indian mutual funds fall into the other category of offshore funds. For an Irish-domiciled resident, a gain on such a fund, where the fund is the common accumulating type, is taxed as income at your marginal income-tax rate plus the social levies, rather than at the 33% capital-gains rate or the 41% exit rate. It is not the headline 41%, but at a top marginal rate it is not gentle either, so the label matters.
The treaty makes the gain Ireland-only
Here is the part that changes the picture, and it is widely missed. The India-Ireland treaty allocates capital gains by type. Gains on shares of an Indian company can be taxed by India. But a mutual-fund unit is not a share, it is a unit in a trust, a distinction Indian tribunals have settled and applied, so a fund-unit gain falls into the treaty's residual category, which is taxable only in the country of residence, Ireland.
The consequence is valuable: India does not have the treaty right to tax your Indian mutual-fund gain at all. So the TDS the fund house deducts on redemption is not the final tax; you can claim treaty relief with a tax residency certificate and Form 10F to reduce the withholding, or file an Indian return to recover it. This is the same basis on which residents of the UAE, Singapore and Mauritius get their Indian fund gains out of Indian tax. It is important to keep this separate from direct Indian shares, which the treaty does let India tax, so shares are not sheltered the way fund units are.
Putting the two together, with domicile
Combine the pieces and the outcome for a non-domiciled Irish resident can be very light. The treaty takes the gain out of Indian tax, recoverable if the fund house withheld, and the remittance basis means Ireland taxes it only if you bring the proceeds into Ireland. So a fund gain left in India can end up taxed in neither country, subject to actually recovering the Indian TDS and to the detail of how the remittance basis applies to these funds, which is a point to take advice on.
For an Irish-domiciled resident, the treaty still removes India's tax, but Ireland taxes the gain as income at your marginal rate on the arising basis. On the India side, remember the fund house withholds at the domestic rates, equity funds at 12.5% for long-term gains and 20% for short-term, debt funds at slab, so the recovery via the treaty is where the value is. A practising CA claims the treaty relief, recovers the Indian TDS, and gives your Irish accountant the figures for the Irish charge.