Ireland Landlord Mortgage Interest Relief Calculator
Irish landlords can deduct 100% of mortgage interest against rental income. Calculate the deduction, the rental profit after expenses, and tax due at your marginal rate.
| Rental income | — |
| – Mortgage interest (100% deductible) | — |
| – LPT | — |
| – Insurance | — |
| – Property management | — |
| – Repairs/maintenance | — |
| = Taxable rental profit | — |
| Tax at marginal rate | — |
Ireland fully restored the 100% mortgage interest deduction for residential landlords in 2019 — unlike the UK's section 24 restriction. Combined with high rental yields (Dublin 6–8%), Irish buy-to-let remains tax-favorable to leveraged investment. Properly tracked expenses can materially reduce taxable rental profit.
Allowable Expenses
100% deductible: mortgage interest (restored 2019), property management, repairs/maintenance, insurance, advertising, accountancy fees, RTB tenancy registration, LPT (since 2022). Capital allowances: furniture & fittings depreciated 12.5%/year over 8 years (furnished lettings). Not deductible: mortgage capital repayments, personal use portions, improvement costs (capitalized, not expensed).
Marginal Rate Math
At Irish top marginal rate (40% IT + 8% USC + 4% PRSI = 52%), every €1,000 of mortgage interest deduction saves €520 in tax. This makes mortgage gearing far more attractive than in the UK (where Section 24 restricts the relief to 20% basic rate).
Rental Losses
Rental losses (allowable expenses > rental income) can be: (1) offset against other rental income in the same year, (2) carried forward indefinitely against future rental profit, but NOT (3) offset against other income types like PAYE salary. Track losses on Form 11 each year.
Last updated May 2026. Sources: Revenue.ie Rental Income, RTB Tenancy Registration.