Estimate your Irish mortgage interest relief (MIR) tax credit for 2024–2025 under the Revenue temporary relief scheme for owner-occupiers.
Updated 2026-06-26 — based on Revenue.ie published MIR rules for the 2024 tax year, extended in Budget 2025.
The mortgage relief calculator for Ireland is a free, browser-based 2026 tool that estimates your Mortgage Interest Relief (MIR) tax credit under Revenue's temporary scheme for owner-occupiers. Enter your 2022 baseline and 2024 mortgage interest — get an instant 20% qualifying relief calculation capped at €1,250 (single) or €2,500 (joint), with eligibility flags for the principal-private-residence rule and €80k–€500k outstanding-balance gate.
The calculator follows the Revenue MIR formula step-by-step: (1) subtract 2022 interest from 2024 interest to get the qualifying increase; (2) multiply by 20% for the gross relief; (3) cap at €1,250 (single) or €2,500 (married/joint-assessed) per Revenue.ie Mortgage Interest Relief. All arithmetic happens in your browser — nothing is uploaded. The eligibility panel flags the three blockers: non-PPR property, outstanding balance outside €80k–€500k as at 31 December 2022, or no actual interest increase.
Ireland's Mortgage Interest Relief (MIR) is a temporary tax credit introduced in Budget 2024 to help owner-occupiers who faced significantly higher mortgage repayments due to ECB interest rate rises. The relief is worth 20% of the increase in qualifying mortgage interest paid in 2023 (and 2024) compared to 2022, subject to a cap.
The relief is a tax credit — meaning it directly reduces your income tax bill, not just your taxable income. If your qualifying interest increase was €2,000, you receive a €400 tax credit (20% × €2,000).
To qualify for mortgage interest relief in 2024, all of the following must apply:
Relief for 2024 works on the same basis as 2023 — the increase in qualifying interest versus 2022 is calculated, and 20% of that increase (up to the cap) becomes a tax credit.
The maximum MIR tax credit for 2024 is:
These caps were set in Budget 2025. To hit the maximum single-person credit of €1,250, your interest must have increased by €6,250 or more compared to 2022 (€6,250 × 20% = €1,250).
For PAYE workers: log in to Revenue myAccount, choose "Manage your tax 2024," and add the mortgage interest figures under "Tax Credits — Mortgage Interest Relief." Provide your Account Number (BIC + IBAN of the lender) plus the 2022 and 2024 interest amounts (your lender issues a Mortgage Interest Certificate each February). Revenue applies the credit against your end-of-year liability and refunds any over-deducted PAYE. Self-employed claimants enter the figures on their Form 11 self-assessment under "Tax credits → Mortgage Interest Relief." Filing deadline: 31 October 2025 (or mid-November via ROS) for the 2024 tax year.
Budget 2025 (delivered October 2024) extended MIR for the 2024 tax year on the original terms — no enhancement, no Budget-2026 extension confirmed yet. The relief was always positioned as temporary, tied to the ECB rate cycle. As the ECB has begun cutting rates from the 4.5% 2023 peak toward 2.5–3%, the pressure that justified MIR is easing — most analysts expect Budget 2026 to either taper the credit or let it sunset after the 2024 tax year. Treat any 2025-onwards relief as unconfirmed until the Minister's Budget 2026 announcement in October 2025. Check Revenue.ie's Tax and Duty Manual updates if you need the current legal position before filing.
Estimates only — your actual MIR depends on Revenue's assessment of your individual return, prior PAYE credits, and any arrears or restructuring arrangements. For complex cases (joint assessment splits, mid-year property switches, mortgage top-ups), consult Revenue.ie or a tax adviser. Sources: Revenue.ie — Mortgage Interest Relief · Department of Finance — Budget 2025 · Citizens Information — MIR.