Irish Mortgage Affordability Calculator
Central Bank rules cap first-time buyers at 4 times gross income and 90% LTV. Subsequent buyers are limited to 3.5 times income and 90% LTV. Buy-to-let investors face a 70% LTV limit. Select your buyer type below to see which constraint binds for your situation.
This is an estimate. Lenders also consider credit history, outgoings, and their own criteria.
Exceptions exist but are rationed
Central Bank rules allow lenders to grant a limited number of exceptions each year. Up to 15% of new first-time buyer lending can exceed the 4x cap, and up to 5% can exceed the 3.5x cap for subsequent buyers. Banks ration these: expect to need a strong financial profile, stable income, and substantial savings history.
Rules sourced from Central Bank of Ireland Mortgage Measures Framework. Last reviewed 2026-08-01.
How your borrowing limit is calculated
Lenders apply two types of constraints. The first is an income multiple or debt-to-income ratio - a cap on the loan size relative to your gross income. The second is a stressed affordability assessment: your income must support the monthly payment at a higher, hypothetical interest rate. Whichever constraint produces the lower loan amount is the binding one. The calculator shows which rule limits you under the binding constraint field.
What this doesn't include
This is an estimate based on published regulatory rules. Individual lenders also consider your credit score, employment stability, nature of income (self-employed versus salaried), existing financial commitments, and the property type. A lender may offer less than the regulatory maximum for any of these reasons. The figure here is a starting point for conversations with lenders, not a guaranteed offer.
Why your lender may quote a different figure
Lenders have discretion to lend below the regulatory cap and to grant exceptions above it in limited cases. The stress test rate varies by lender - some use a rate higher than the regulatory floor. Bonus, commission, or overtime income may be discounted by 50% or more. If the bank's figure is significantly lower than this calculator suggests, ask them which specific constraint is limiting your application.
Frequently asked questions
What is a mortgage stress test?
A stress test assesses whether you could still afford repayments if interest rates rose. In the UK, lenders test at roughly 3% above the revert rate. In Canada, the qualifying rate is the higher of your contract rate plus 2% or 5.25%. In Australia, APRA requires a 3% buffer above the loan rate. The stress test is often the binding constraint - not the income multiple.
How does a larger deposit affect how much I can borrow?
A larger deposit reduces the loan-to-value ratio, which can unlock better interest rates and remove mortgage insurance requirements. It does not directly increase most lenders' income multiples, but a lower rate means a given income can support a larger loan amount. In some countries, exceeding certain LTV thresholds (e.g., 90% in Ireland) requires regulatory exceptions.
Does the result include stamp duty or closing costs?
No. This calculator shows the maximum loan amount. Stamp duty, legal fees, survey costs, and other purchase costs must come from your savings separately. In most countries you cannot borrow to cover these costs, and lenders will verify your ability to fund them independently.
Why might my bank offer me less than the calculator shows?
Lenders apply their own internal criteria on top of regulatory requirements. Your credit score, monthly outgoings, existing debt commitments, employment type, and the specific property can all lead a lender to offer less. The calculator applies the regulatory maximum - individual lender decisions sit below that ceiling.
Do existing debts reduce how much I can borrow?
Yes, significantly. Car loans, student loans, credit card minimum payments, and personal loan commitments all reduce the income available to service a mortgage. Add your monthly debt payments in the optional field above to see how much they reduce your borrowing capacity under the debt-to-income or income multiple rules in your country.
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The repayment engines behind this site are tested against worked examples published by FRED, the Bank of Canada, the Bank of England and the Reserve Bank of Australia. Found an error? Contact us