The Central Bank of Ireland’s mortgage rules determine how much you can borrow to buy a home. These regulations — introduced in 2015 and still in force in 2026 — set strict limits on loan-to-value (LTV) and loan-to-income (LTI) ratios for residential mortgages. They apply to every bank and lender in Ireland, and they’re the primary reason you can’t simply borrow whatever a lender might theoretically offer you.
If you’re buying in Ireland, understanding these rules is essential. They directly control your deposit requirement and maximum loan size, regardless of your financial circumstances.
Why the Central Bank Introduced These Rules
The mortgage rules were implemented in February 2015, following Ireland’s property crash and banking crisis. During the boom years, Irish banks lent freely — 100% mortgages were common, and some borrowers took loans worth six or seven times their income.
When property prices collapsed after 2008, thousands of homeowners ended up in negative equity, unable to sell without significant losses. The resulting mortgage arrears crisis destabilised the banking system and required state intervention.
The Central Bank’s rules aim to prevent this happening again by:
- Ensuring borrowers have equity in their homes from day one
- Limiting debt levels relative to income
- Building resilience into the mortgage market
- Protecting both borrowers and lenders from excessive risk
These aren’t lending guidelines or recommendations. They’re binding regulations with the force of law.
Loan-to-Value (LTV) Limits: How Much You Can Borrow
The LTV ratio compares your mortgage amount to the property’s value. Under Central Bank rules, your maximum LTV depends on whether you’re a first-time buyer or not.
First-Time Buyers
First-time buyers can borrow up to 90% of the property value. You need a 10% deposit.
Example: For a €350,000 property, you can borrow a maximum of €315,000. Your deposit must be at least €35,000.
Second and Subsequent Buyers
If you’ve owned a home before (even if you’ve since sold it), you can borrow up to 80% of the property value. You need a 20% deposit.
Example: For the same €350,000 property, you can borrow a maximum of €280,000. Your deposit must be at least €70,000.
This distinction matters significantly. A second-time buyer needs double the deposit of a first-time buyer for the same property.
What Counts as a First-Time Buyer
The Central Bank defines a first-time buyer as someone who has never owned residential property in Ireland or abroad. This includes:
- Anyone buying their first home
- Someone who inherited property but never lived in or owned it personally
It does not include:
- Anyone who previously owned a home, even if sold at a loss
- Someone who jointly owned property with a spouse or partner
- Property investors, regardless of whether they lived in the property
If you’re buying jointly with a partner who previously owned a home, you’re both treated as second-time buyers for LTV purposes.
Loan-to-Income (LTI) Limits: The 3.5x Rule
The LTI ratio compares your mortgage amount to your gross annual income. The Central Bank caps this at 3.5 times your gross income.
For joint applications, the multiple applies to your combined gross income.
How It Works
- Single applicant earning €60,000: maximum loan of €210,000 (€60,000 × 3.5)
- Two applicants earning €45,000 each (€90,000 combined): maximum loan of €315,000 (€90,000 × 3.5)
- Two applicants earning €70,000 and €40,000 (€110,000 combined): maximum loan of €385,000 (€110,000 × 3.5)
This is the single most restrictive element of the Central Bank rules for many borrowers, particularly in Dublin and other high-price areas where property values have outpaced wage growth.
What Income Counts
Lenders assess income according to their own policies, but generally include:
- Basic salary: Your full gross annual salary before tax
- Guaranteed bonuses: Contractual bonuses you receive every year
- Regular overtime: Typically 50-100% if you’ve earned it consistently for two years
- Commission: Usually 50-100% if earned regularly for two years
- Rental income: Some lenders include 75-80% of proven rental income from investment properties
Income that typically doesn’t count:
- One-off bonuses
- Child benefit or other social welfare payments
- Sporadic overtime
- Maintenance payments (though some lenders may consider these)
The Reality of 3.5x Income
In October 2026, with median Dublin house prices around €420,000, a single buyer needs a gross income of €120,000 to reach the 3.5x limit — well above the national median wage of approximately €45,000.
This is why joint applications are now the norm for first-time buyers. Two people earning €60,000 each have a combined borrowing capacity of €420,000, making average-priced homes accessible.
Lender Exemptions: When Banks Can Break the Rules
The Central Bank allows lenders to exceed the LTV and LTI limits on a percentage of loans each quarter. These are called exemptions or exceptions.
LTI Exemption Quotas
Lenders can grant exemptions on:
- 20% of first-time buyer mortgages above 3.5x income
- 10% of second and subsequent buyer mortgages above 3.5x income
These percentages apply per lender, per quarter. If Bank of Ireland approves 1,000 first-time buyer mortgages in Q3 2026, it can approve up to 200 of them above the 3.5x limit.
LTV Exemption Quotas
Lenders have more limited room on LTV:
- 5% of first-time buyer mortgages above 90% LTV (maximum 95%)
- 2% of second-time buyer mortgages above 80% LTV (maximum 90%)
These 95% LTV mortgages are rare. Most exemptions are granted on LTI, not LTV.
How Exemptions Work in Practice
Exemptions aren’t automatic. Lenders allocate them based on:
- Strong applications: High earners with room to service higher debt
- Deposit size: Applicants with larger deposits are more attractive
- Property location: Central Bank data shows exemptions are most common in Dublin
- Quarter timing: Exemptions get scarcer as quarters progress and lenders approach their quotas
If you need to borrow 4x income, you’ll need:
- Impeccable credit history
- Stable employment
- Demonstrated ability to save
- A convincing case that you can afford repayments
- A bit of timing luck
Applying early in a quarter (January, April, July, October) marginally improves your chances.
How LTV and LTI Work Together
Both limits apply simultaneously. Your maximum mortgage is whichever is lower.
Example 1: LTI is the Constraint
- Property value: €400,000
- Deposit: €40,000 (10%)
- Gross income: €90,000
- LTV limit: €360,000 (90% of €400,000)
- LTI limit: €315,000 (3.5 × €90,000)
Maximum loan: €315,000 — you’re constrained by income, not deposit. You’d need €85,000 cash to buy this property (€40,000 deposit plus €45,000 extra to bridge the gap).
Example 2: LTV is the Constraint
- Property value: €300,000
- Deposit: €30,000 (10%)
- Gross income: €85,000
- LTV limit: €270,000 (90% of €300,000)
- LTI limit: €297,500 (3.5 × €85,000)
Maximum loan: €270,000 — you’re constrained by deposit. Despite having income capacity to borrow more, you can’t exceed 90% LTV without an exemption.
| Scenario | Property Value | Deposit | Income | LTV Limit | LTI Limit | Actual Loan |
|---|---|---|---|---|---|---|
| Income-constrained FTB | €400,000 | €40,000 | €90,000 | €360,000 | €315,000 | €315,000 |
| Deposit-constrained FTB | €300,000 | €30,000 | €85,000 | €270,000 | €297,500 | €270,000 |
| Second buyer | €400,000 | €80,000 | €110,000 | €320,000 | €385,000 | €320,000 |
Rules for Different Property Types
Primary Dwelling Homes (PDH)
The rules above apply to properties you intend to live in as your primary residence — the overwhelming majority of mortgages.
Buy-to-Let Properties
Investment properties have different rules:
- 70% maximum LTV: You need a 30% deposit minimum
- No LTI limit: Assessment is based on rental income, not your salary
- Rental coverage test: Monthly rent must cover at least 125% of the mortgage payment
There are no exemption quotas for buy-to-let mortgages.
Self-Builds
Mortgages for building your own home follow the same LTV and LTI limits as standard purchases. The practical difference is that funds are released in stages as construction progresses, and lenders typically require site ownership plus detailed planning permission and costings before approval.
Buy-to-Let and Investment Properties
The Central Bank treats buy-to-let mortgages separately because the risk profile differs. Investment property loans aren’t assessed on your income multiple — instead, lenders evaluate whether the rental income can service the mortgage.
The standard test: monthly rental income must equal at least 125% of the monthly mortgage payment. On a €300,000 buy-to-let mortgage at 5% interest, the monthly payment is roughly €1,610. Required monthly rent: €2,013 (€1,610 × 1.25).
This 125% buffer accounts for void periods, maintenance costs, and interest rate increases.
You still need 30% deposit (70% LTV), and the 3.5x income multiple doesn’t apply — though lenders still assess affordability using your overall financial position.
Common Misconceptions About the Rules
“The rules are guidelines” — No. These are binding regulations. Lenders face Central Bank sanctions if they systematically breach the quotas.
“I can get 95% LTV if I ask” — Unlikely. Only 5% of FTB mortgages can exceed 90% LTV. These slots are highly competitive.
“My bank can choose to ignore the rules” — No. Individual loan officers have no discretion. Exemptions require senior credit committee approval and count against quarterly quotas.
“The rules apply to mortgage amount, not property price” — Correct. LTV is calculated on loan vs. value, not total price. Your deposit sits outside both limits.
“I can borrow more if I have a guarantor” — Partially true. Guarantor mortgages may help you meet affordability tests, but they don’t exempt you from LTV or LTI limits unless your lender grants a formal exception.
How the Rules Affect Different Buyers
First-Time Buyers
The 10% deposit requirement is the most favourable treatment in the rulebook. Combined with 20% LTI exemption quota availability, first-time buyers have the greatest flexibility.
Challenge: Saving that 10% plus costs (stamp duty, legal fees, surveys) typically requires €40,000-50,000 for an average home.
Second-Time Buyers
The jump to 20% deposit is significant. Someone who bought a €250,000 home in 2015 and now wants to trade up to €400,000 needs:
- €80,000 new deposit (20% of €400,000)
- Less any equity from sale of first home
- Costs of buying and selling (potentially €15,000-20,000)
Even with equity from the first property, this can be a substantial cash requirement.
Single Buyers
With median wages around €45,000, a single buyer can borrow €157,500 at 3.5x income. This realistically limits solo buyers to properties under €175,000 outside major urban areas, or requires an LTI exemption for anything close to median prices.
Joint Buyers Without Children
Two earners maximise borrowing capacity. Combined income of €90,000 allows a €315,000 loan — enough to buy median-priced properties in most areas outside Dublin city centre.
Buyers with Dependents
The Central Bank rules don’t distinguish between applicants with or without children. However, lenders do. Your disposable income assessment (what you have left after essential spending) accounts for childcare, which can significantly reduce your maximum loan below the 3.5x ceiling.
What Happens If You Exceed the Limits
You can’t. Lenders cannot legally advance you a mortgage that breaches these limits without granting a formal exemption.
If your application requires 4x income or 95% LTV, your lender will either:
- Grant you an exemption (if you qualify and quota remains)
- Decline the application
- Ask you to reduce the loan amount
There’s no third option. You can’t shop around to find a lender willing to “bend the rules” — they all operate under identical Central Bank constraints.
Future Changes to the Rules
As of October 2026, the Central Bank periodically reviews these measures but has maintained them largely unchanged since 2015. Small adjustments have been discussed:
- Raising LTI limits to 4x (no change implemented as of 2026)
- Increasing exemption quotas (not adopted)
- Regional variations in LTV limits (rejected)
The Central Bank’s stated position is that the rules have contributed to financial stability and manageable household debt levels. Significant changes seem unlikely unless economic conditions change dramatically.
Practical Steps for Working Within the Rules
- Calculate your maximum first: Use the 3.5x multiple to understand your borrowing capacity before house hunting
- Save beyond the minimum: Having 15% deposit instead of 10% improves your exemption chances if you need one
- Boost your income: Overtime, bonuses, or a joint application with a partner increases your 3.5x limit
- Apply early in quarter: January, April, July, October give you first shot at exemption quotas
- Get professional advice: A mortgage broker can identify which lenders have remaining quota and position