Mortgage Calculator (Republic of Ireland)
Estimate your monthly repayments, total interest, and how your plan compares with common Irish mortgage rules.
Used for a simple 4x income check (common LTI guidance for principal homes).
Estimates only. Lender rates, stress tests, exemptions, insurance, and fees can change your final approval and repayment.
How to use this Republic of Ireland mortgage calculator
If you are buying a home in Ireland, this calculator gives you a fast way to estimate your monthly repayment and your total borrowing cost. Enter the purchase price, your deposit, interest rate, and term. The tool then works out:
- Your estimated loan amount
- Your monthly repayment (capital and interest)
- Total amount repaid over the term
- Total interest paid
- Loan-to-value (LTV) and basic deposit-rule checks
Key Irish mortgage rules to understand
1) Deposit and LTV limits
Irish mortgage lending is shaped by Central Bank macroprudential rules. In plain language, this means buyers usually need a minimum deposit:
- First-time buyer: generally minimum 10% deposit (maximum 90% LTV)
- Second/subsequent buyer: generally minimum 20% deposit (maximum 80% LTV)
- Buy-to-let: generally minimum 30% deposit (maximum 70% LTV)
Lenders can issue exceptions in limited cases, but most borrowers should plan around these base rules first.
2) Loan-to-income (LTI) guidance
For principal homes, lenders commonly apply an income multiple check. A simple planning rule is: maximum mortgage ≈ 4 times gross household income. This page includes an optional income field so you can quickly compare your intended loan with that benchmark.
Mortgage repayment formula (what the calculator uses)
The monthly repayment is based on a standard amortising loan formula:
Payment = P × r × (1 + r)n / ((1 + r)n − 1)
- P = loan principal
- r = monthly interest rate (annual rate ÷ 12)
- n = total number of monthly payments
Early in the mortgage, more of each payment goes toward interest. Over time, more goes toward principal.
Example scenario
Suppose you are a first-time buyer purchasing at €350,000 with a €50,000 deposit, a 4.10% interest rate, and a 30-year term. Your starting loan is €300,000. In this type of setup, repayments are often in the mid four-figures per month. Small changes in rate can shift your payment significantly, so it is worth testing multiple rate scenarios before committing.
Costs beyond the mortgage repayment
A monthly repayment is only part of ownership cost. Build a complete budget with:
- Stamp duty
- Solicitor/legal fees
- Survey/valuation fees
- Home insurance and life cover where required
- Property tax and maintenance
- Utility setup and moving costs
Good planning means leaving a cash buffer after you pay your deposit and upfront fees.
How to reduce your mortgage cost in Ireland
Increase deposit where possible
A larger deposit lowers your loan and can improve your LTV band, which may help you access better rates.
Compare fixed vs variable options
Fixed rates give repayment certainty for a defined period. Variable rates may move with market conditions. Compare not just headline rate, but break fees, flexibility, and post-fixed-rate options.
Shorten term only if cash flow allows
A shorter term usually reduces total interest, but increases monthly payments. Choose a term that protects your monthly budget even if costs rise.
Frequently asked questions
Is this calculator accurate enough to apply for a mortgage?
It is a planning tool. Your bank or broker will include policy checks, rate offers, repayment capacity assessments, and documentation review.
Can I get a mortgage if my deposit is below the standard rule?
Possibly through a lender exception, but exceptions are limited and not guaranteed. Most buyers should assume standard deposit levels.
What if rates change after I buy?
If you are on a variable rate, repayments can change. Even fixed-rate borrowers should plan for future resets once the fixed term ends.
Final thoughts
A solid Republic of Ireland mortgage plan balances three things: a realistic deposit, affordable monthly repayments, and enough emergency buffer after move-in. Use this calculator to test scenarios, then validate your options with a qualified mortgage advisor or broker before making offers.