Mortgage Calculator: How Much Can I Borrow in Ireland?

If you’ve started browsing property in Ireland, you’ve probably noticed that every lender’s website promises to show you “how much you can borrow” — but the numbers don’t always match. That’s not a glitch. The Central Bank of Ireland sets hard caps on how much first-time buyers can get, but individual calculators from AIB, Bank of Ireland, and comparison platforms can still return different estimates depending on how they treat your income. This guide cuts through the noise and shows you exactly what the limits are, where the numbers come from, and how to use each calculator to get the most accurate figure before you make an offer.

First-time buyer max multiple: 4x gross annual income · Max loan-to-value: 90% of purchase price · AIB term limit: up to 35 years

The table below summarizes the key regulatory limits set by the Central Bank of Ireland alongside lender-specific thresholds from AIB.

How much can I borrow mortgage Ireland calculator?

Every mortgage calculator in Ireland works within the same regulatory framework set by the Central Bank of Ireland. The LTI (loan-to-income) limit restricts the amount you can borrow to a maximum of 4 times gross income for first-time buyers and 3.5 times for second or subsequent buyers. The LTV (loan-to-value) cap means first-time buyers need a minimum 10% deposit, which translates to a maximum 90% LTV. A single person earning €60,000 annually could borrow up to €240,000 as a first-time buyer, according to Switcher.ie mortgage comparison (Ireland’s financial comparison platform).

First-time buyer limits

First-time buyer income calculation includes basic income plus 50% of average bonuses and non-guaranteed income, with non-guaranteed income averaged over the previous three years at 50% allowance. This means a gross salary of €80,000 produces a maximum mortgage of €320,000 for a first-time buyer under the standard cap, according to Mortgages.ie first-time buyer guide (mortgage information platform serving Irish buyers). The Central Bank also allocates 15% of mortgages for first-time buyers who can exceed the 4× income cap under specific conditions.

Income multiples explained

The income multiple determines your baseline borrowing power, but it is not the only factor lenders consider. AIB states that mortgage terms can extend up to 35 years for owner-occupiers depending on age, and the lender looks at your overall financial situation including income, outgoings, savings, and other loan repayments when assessing borrowing capacity. Only reliable and sustainable income should be included in calculations — bonuses and once-off payments are excluded, according to AIB mortgage FAQ (Ireland’s largest retail bank).

The implication is that even borrowers with identical salaries may receive different loan offers depending on how lenders assess their expense patterns and income stability.

How much can I borrow Bank of Ireland?

Bank of Ireland allows first-time buyers to borrow up to 4 times gross annual income and up to 90% of property value, matching the Central Bank’s standard cap. Their mortgage calculator provides both an affordability estimate and repayment figures, making it useful for borrowers who want to see monthly cost projections alongside their borrowing limit. The Bank of Ireland mortgages page (Ireland’s oldest retail bank) includes calculators for both borrowing capacity and repayment estimation.

Calculator inputs needed

Bank of Ireland’s calculator requires information on your income, existing debt commitments, and property details to generate an estimate. For joint applications, both applicants’ income is typically combined within the same LTI caps unless one applicant qualifies under the Fresh Start rule. The Fresh Start rule allows certain applicants to be treated as first-time buyers even if they previously owned a home, per Mortgage123.ie first-time buyer definition (financial advisory platform).

Repayment estimates

Bank of Ireland UK market offers distinct terms for Irish buyers purchasing in Britain: up to 95% LTV for first-time buyers, minimum loan amount of £150,000, and up to 5× income multiples. The UK market also offers mortgage terms up to 40 years with a maximum age of 80 years on repayment, according to Bank of Ireland for Intermediaries UK products (bank’s intermediary channel).

The pattern shows that Irish buyers purchasing in the UK through Bank of Ireland face significantly different rules than those buying domestically — the 5× multiple can unlock higher borrowing, but the £150,000 floor excludes smaller properties.

How much can I borrow Credit Union?

Credit Union mortgages operate differently from the main retail banks and are not bound by the same Central Bank LTI/LTV caps as AIB, Bank of Ireland, or PTSB. However, most Credit Unions do not publish standardized online calculators, making it difficult to get a quick estimate without contacting your local branch directly. Switcher.ie mortgage comparison (financial comparison platform) notes that Credit Union borrowing limits vary by institution and are typically influenced by individual savings history and loan repayment track record.

Credit Union specifics

Credit Unions in Ireland have traditionally served as community lenders with products tailored to members’ savings behavior. Mortgage availability varies — not all Credit Unions offer mortgage products, and those that do may have restrictions on loan amounts, term lengths, or property types. Some Credit Unions participate in the Help to Buy Scheme (government support program for first-time buyers), though eligibility depends on the specific lender.

Comparison to banks

The key difference between Credit Union and bank mortgages is the regulatory framework. Banks must comply with Central Bank mortgage measures including LTI and LTV limits, while Credit Unions operate under their own regulatory framework through the Central Bank of Ireland Credit Union regulation. This means a Credit Union may offer more flexibility in assessing your individual circumstances but may also have different risk criteria that affect approval.

The catch is that flexibility comes with reduced transparency — you cannot comparison-shop Credit Union mortgages online the way you can with bank products.

AIB mortgage calculator how much can I borrow?

AIB offers a dedicated mortgage affordability calculator alongside a separate deposit calculator, providing a two-step process for first-time buyers to understand both how much they can borrow and how much deposit they need. The calculator requires information on income and major spending categories, generating an Approval in Principle figure and estimated monthly repayment amounts. AIB mortgage calculator tool (Ireland’s largest retail bank by market share) is designed for owner-occupiers and considers the full financial picture — not just income multiples.

AIB affordability tool

The AIB affordability tool goes beyond the basic 4× income calculation by factoring in your outgoings, savings behavior, and existing loan commitments. AIB only includes reliable and sustainable income in calculations — bonuses and once-off payments are explicitly excluded, according to AIB mortgage FAQ. This conservative approach often produces a lower borrowing estimate than the theoretical 4× cap, reflecting the lender’s risk assessment methodology.

Deposit requirements

AIB’s deposit calculator helps first-time buyers understand how much they need to save before applying. For standard residential purchases, AIB requires at least 10% deposit in line with Central Bank rules, but the calculator also accounts for the Help to Buy scheme which can supplement your deposit with a tax rebate. AIB mortgage terms can extend up to 35 years for owner-occupiers depending on age, which affects both monthly repayment amounts and total interest paid over the life of the loan.

The implication is that AIB’s estimate is typically more conservative than the Central Bank’s maximum — treat it as a floor for budgeting rather than a target for negotiations.

Mortgage repayments calculator?

While the “how much can I borrow” question tells you your affordability ceiling, a repayments calculator shows you what that ceiling actually costs in monthly terms. Both AIB and Bank of Ireland offer repayment calculators alongside their borrowing estimates, and third-party platforms like Switcher.ie mortgage comparison provide comparison tools that can estimate repayments across multiple lenders simultaneously.

Using repayment tools

Repayment calculators require you to input the loan amount, interest rate, and term length to generate monthly cost estimates. The accuracy of these estimates depends heavily on the interest rate assumption — variable rate products will fluctuate, while fixed rate products lock in a rate for a set period. Mortgages.ie first-time buyer guide (mortgage information platform) notes that many calculators use representative interest rates rather than your actual approved rate, which can cause significant variance between estimates and final offers.

Second mortgage options

Second mortgages in Ireland typically fall into two categories: additional borrowing on an existing mortgage (top-up) or a second charge on a property where you already have a mortgage. Both options are subject to Central Bank lending rules and require your existing lender’s approval for additional borrowing above €10,000. The maximum you can borrow on a second mortgage depends on the combined LTV of both loans against the property value, with the 90% LTV cap for first-time buyers applying to the total debt outstanding.

The implication is that second mortgages can be useful for home improvements or debt consolidation, but the combined borrowing cannot exceed regulatory caps without triggering affordability reassessment.

The comparison below shows how the four main calculator tools differ in their inputs, outputs, and best-use cases.

How to use these calculators step by step

Getting an accurate mortgage estimate requires more than just entering your salary. Follow these steps to use each calculator effectively and understand what the numbers actually mean for your home-buying timeline.

1. Gather your income documents. Collect your most recent payslips (3 months minimum), P60, and details of any non-guaranteed income like bonuses or commission averaged over the past three years. If self-employed, you will need two to three years of accounts or Revenue MYO statements.
2. Calculate your net monthly surplus. Before entering figures into any calculator, determine how much of your monthly income remains after fixed expenses (rent, loans, utilities, childcare). Lenders assess your ability to service a mortgage against your disposable income, not just your salary multiple.
3. Enter income using the 50% non-guaranteed rule. If you receive bonuses or overtime, calculate the three-year average and enter 50% of that figure as part of your gross income. Do not include once-off payments — AIB explicitly excludes these from calculations.
4. Check the LTV cap against your deposit. First-time buyers need 10% deposit minimum (90% LTV). Calculate your property price range by dividing your maximum loan by 0.9. A €240,000 loan means you can afford properties up to approximately €267,000 with a €27,000 deposit.
5. Cross-reference with the Help to Buy scheme. If you are a first-time buyer purchasing a new property up to €500,000, the Help to Buy scheme (government tax rebate program) can supplement your deposit with up to €30,000, reducing your required savings.
6. Run estimates on at least two platforms. AIB and Bank of Ireland may return different figures even for identical inputs because they apply different affordability overlays. Switcher.ie mortgage comparison (financial comparison platform) allows you to compare results across lenders in a single session.
7. Book a broker appointment with your estimate in hand. Mortgage brokers have access to products not available directly from lenders and can explain why your calculator estimate differs from your actual approval amount. Ask the broker to walk through the lender’s affordability assessment criteria specifically.

“How much you can borrow really depends on how much you can comfortably afford in monthly repayments for the life of your mortgage, which may be up to 35 years for owner occupiers, depending on your age.”

— AIB (Ireland’s largest retail bank)

“The LTI limit restricts the amount of money you can borrow to a maximum of 4 times gross income for first-time buyers and 3.5 times gross income for second or subsequent buyers.”

— Central Bank of Ireland (Ireland’s financial regulator)

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