Property
Mortgage Interest Tax Credit Calculator Ireland
Compare full-year interest with 2022, apply the claim-year cap and available Income Tax. This free mortgage interest tax credit calculator ireland shows the calculation and its assumptions so you can compare your own figures.
Your results
Compare full-year interest with 2022, apply the claim-year cap and available Income Tax.
Rules checked for 2026 on 2026-10-06. Scope: Full-year claims 2023–2026; 2026 relief halved
Calculated outcomes
- Interest Increase
- €4,000.00
- Eligible Increase
- €2,000.00
- Annual Limit
- €625.00
- Unused Credit
- €0.00
- Assessment
- Qualifying balance and confirmed conditions; Revenue decides the claim
Assumptions and estimates
- Full-year loan and one claimant per qualifying residence only. Loan must have existed throughout 2022 and the claim year; qualifying-property, LPT and tax-compliance conditions must be confirmed. Part-year loans, additional borrowing, transfers and shared claims need Revenue's apportionment and are not modelled. Credit cannot offset USC or PRSI.
- Method: For 2023–2025: 20% of positive interest increase, capped at €1,250. For 2026: 20% of 50% of the increase, capped at €625. Limit the claim to available Income Tax.
- One claimant, one qualifying residence, full-year loans only. Part-year interest, multiple claimants, refinancing/additional borrowing and property eligibility need Revenue assessment. No USC or PRSI relief.
Sources: Revenue qualifying conditions, Revenue 2025/2026 worked example
Useful next steps
- Lending limits are a guide only. Contact a lender or mortgage broker for an assessment before committing to a purchase.
- Use Compare options to test an alternative side by side.
- Check the official sources above before relying on the figure.
- Copy, print or download a record of this calculation when you need one.
Reports open your email app addressed to s@s1.ie with the public page address only. Your inputs are never added.
How the mortgage interest tax credit calculation works
For 2023–2025: 20% of positive interest increase, capped at €1,250. For 2026: 20% of 50% of the increase, capped at €625. Limit the claim to available Income Tax.
One claimant, one qualifying residence, full-year loans only. Part-year interest, multiple claimants, refinancing/additional borrowing and property eligibility need Revenue assessment. No USC or PRSI relief.
Applicable rules year: 2026. Sources checked 2026-10-06: Full-year claims 2023–2026; 2026 relief halved Published rules are used, not proposed changes.
Using this calculator
- Enter your own figures in the labelled inputs. Keep the currencies, units and time periods consistent.
- Choose any applicable rate profile, pattern or assumption shown for this tool. Open additional inputs when relevant.
- Review available credit and calculated credit, then read the stated assumptions and eligibility conditions before using the result.
Official sources and further information
Worked example
This is a static example using illustrative inputs, not facts about you or today’s date. The displayed eligibility selections and assumptions apply only to this example.
See example inputs
- Claim year
- 2026
- Outstanding qualifying balance on 31 December 2022 (€)
- 250000
- Full-year interest paid in 2022 (€)
- 10000
- Full-year interest paid in claim year (€)
- 14000
- Income Tax liability available to offset (€)
- 2000
- Full-year loan, qualifying residence, LPT and tax-compliance conditions confirmed
- Yes
- Available Credit
- €400.00
- Calculated Credit
- €400.00