Is switching your mortgage worth it in Ireland? A worked €250,000 example

A mortgage rate can look like a small number.

The difference between 4.5% and 3.5% is only one percentage point. On a large balance over many years, that one point can be worth tens of thousands of euro.

That is why mortgage switching deserves more than a glance at the new monthly repayment.

A proper comparison asks:

• how much does the monthly payment fall?
• how much interest is avoided?
• what does the switch cost?
• is there a fixed-rate break fee?
• is cashback genuinely valuable or just distracting from a higher rate?
• are you keeping the same remaining term?
• and can you actually qualify for the new mortgage?

This article works through those questions using an illustrative €250,000 mortgage with 20 years remaining.

The rates are examples, not a claim about the best mortgage rate available today.

The worked example

Assume:

Mortgage detail	Current mortgage	Alternative mortgage
Balance	€250,000	€250,000
Remaining term	20 years	20 years
Interest rate	4.5%	3.5%
Repayment type	Capital and interest	Capital and interest

Using the standard amortising-mortgage formula:

• current repayment: approximately €1,581.62 a month;
• alternative repayment: approximately €1,449.90 a month;
• monthly reduction: approximately €131.72;
• annual reduction at those rates: approximately €1,581.

If both rates remained unchanged for the full 20 years, the scheduled interest would be approximately:

• €129,590 at 4.5%;
• €97,976 at 3.5%.

That is a difference of about €31,614 before switching costs.

You can replace every assumption with your own figures in the Mortgage Switch Calculator.

The first number to calculate is not the monthly saving

The monthly saving is useful.

The more important early question is:

How long will it take for the monthly saving to recover the cost of switching?

Suppose the switch involves an illustrative €2,000 of net upfront costs after taking account of any contribution from the new lender.

At a monthly saving of €131.72:

€2,000 ÷ €131.72 = about 15 months.

If you expect to keep the mortgage well beyond that point, the switch has more time to generate a net financial benefit.

If you expect to sell the property in six months, the same switch could make much less sense.

That break-even calculation is one of the most useful outputs in the Mortgage Switch Calculator.

What actually costs money when you switch?

The CCPC says switching can involve:

• legal fees;
• a property valuation;
• a BER assessment where relevant to a green-rate product;
• and a breakage or early-repayment fee if you leave a fixed rate early.

There is no single universal switching-cost figure.

The amount depends on the existing mortgage, the new lender, the solicitor, the property and any incentives being offered.

That is why Compound does not hard-code a supposed “average switching fee” into the worked example.

Enter the actual figures you are quoted.

CCPC: a guide to switching.

The fixed-rate break fee can completely change the timing

If you are on a variable rate, switching normally does not involve a fixed-rate early-repayment charge, although other switching costs can still apply.

If you leave a fixed-rate mortgage before its fixed period ends, a breakage fee may apply.

The CCPC explains that the fee can depend on:

• how much mortgage debt is being repaid early;
• how long remains in the fixed period;
• and changes in market interest rates since the rate was fixed.

The amount can therefore change over time.

Do not assume a fixed-rate break fee from an online example. Ask your existing lender for the current figure.

Add a €4,000 break fee to our example

Suppose:

• other net switching costs = €2,000;
• fixed-rate break fee = €4,000;
• total net cost = €6,000.

With monthly savings of €131.72, the simple break-even period becomes:

€6,000 ÷ €131.72 = about 46 months.

That is close to four years.

The lower rate has not stopped being valuable. The upfront cost has simply delayed the point at which the switch becomes a net saving.

This is why someone two months from the end of a fixed rate may make a different decision from someone with five years left.

You may not need to move lender at all

“Switching” can mean two different things.

You may:

1. move to a different mortgage product with your existing lender; or
2. refinance with a different lender.

The first route can be simpler because you are not transferring the mortgage to another institution.

It may also leave money on the table if another lender is offering a materially better overall deal.

The Central Bank’s Consumer Protection Code gives borrowers specific switching protections. Among other requirements, a lender must tell you about cheaper mortgage options 60 days before you come out of a fixed rate, provide personalised saving estimates for alternative refinancing options and remind you again several weeks later.

The Code also requires a lender to provide information needed for switching and, for a completed switching application, communicate a decision within the prescribed timeframe.

Central Bank: mortgage switching protections.

So the first call may be to your current lender:

What is the cheapest rate I can move to without refinancing elsewhere?

Then compare that with the wider market.

Cashback is not free money

Cashback can make a mortgage offer immediately attractive.

That does not mean it is the cheapest mortgage.

The CCPC gives a simple way to think about cashback offers:

compare the extra repayments caused by the higher rate with the value of the cashback.

Suppose:

• Mortgage A has the lower rate;
• Mortgage B charges €70 more per month but gives €3,000 cashback;
• the relevant fixed period is three years.

The extra repayment cost over those 36 months would be:

€70 × 36 = €2,520.

In that simplified comparison, €3,000 cashback would more than offset the €2,520 extra repayments during that period.

But the comparison cannot stop there.

After the fixed period, the rate may change. The mortgage still has a remaining balance. There may be conditions attached to the cashback. And a higher rate can continue costing more after the initial incentive has been spent.

The CCPC therefore recommends looking both at the fixed-rate period and the longer-term cost.

CCPC: switching and cashback.

The term-extension trap

A mortgage switch can produce a dramatic reduction in the monthly payment for two different reasons:

1. the rate is lower;
2. the term is longer.

Only the first one represents a pure rate saving.

Consider the same €250,000 balance.

Keep 20 years remaining at 3.5%

Approximate repayment:

€1,449.90 per month

Approximate scheduled interest:

€97,976

Extend the new mortgage to 25 years at 3.5%

Approximate repayment:

€1,251.56 per month

That looks much better for monthly cash flow.

But scheduled interest rises to approximately:

€125,468.

The payment has fallen by another €198 a month largely because the debt is being repaid for five extra years.

Extend it to 30 years

At 3.5%, the repayment falls again to approximately:

€1,122.61 a month.

But scheduled interest rises to approximately:

€154,140.

That is more scheduled interest than staying on the original 20-year mortgage at 4.5% in this illustration.

A lower interest rate can therefore coexist with a higher total interest bill if the mortgage is stretched out long enough.

That does not automatically make a longer term wrong. Lower required payments may provide valuable breathing room.

It simply means:

compare like with like before celebrating the monthly saving.

The Mortgage Switch Calculator lets you set the old and new terms separately so this effect is visible.

Lower LTV can help you access a different rate

Loan-to-value, or LTV, is the mortgage balance divided by the property’s value.

If:

• your mortgage balance has fallen; or
• your home’s value has risen;

your LTV may be lower than when the mortgage began.

Some lenders price mortgages differently at different LTV bands.

The CCPC therefore recommends checking whether the equity now in your home opens up a cheaper rate.

A new valuation may be needed when moving lender.

This is one reason someone who has made years of repayments should not assume the mortgage product they originally chose remains competitive.

A good BER can matter too

Some lenders offer rates linked to the Building Energy Rating of the property.

If the home has improved since the mortgage was taken out—or if you did not previously use a green-rate product—a BER may affect the products available.

Again, the headline rate is not enough.

If obtaining or updating the BER introduces a cost, include it in the switch calculation.

Switcher mortgages are treated differently under the Central Bank mortgage measures

The Central Bank’s macroprudential mortgage measures impose loan-to-income and loan-to-value limits on many new mortgages.

However, the Central Bank currently lists switcher mortgages as exempt from the LTV and LTI limits in those measures.

That does not mean switching is automatic.

The new lender still carries out its own credit and affordability assessment and can have its own underwriting criteria.

Central Bank: Mortgage Measures.

This distinction matters because “exempt from the macroprudential limit” is not the same as “guaranteed approval”.

You effectively apply for a mortgage again

Moving to another lender involves much of the same financial assessment as taking out a new mortgage.

The lender may look at:

• income;
• existing debt;
• repayment record;
• bank statements;
• employment circumstances;
• affordability;
• property valuation;
• and other underwriting requirements.

The CCPC describes the switching process as similar to a fresh mortgage application.

Someone whose circumstances have changed materially since buying the home may therefore find that a switch which looks attractive mathematically is not available in practice.

Mortgage protection can be a hidden obstacle

Before switching, the CCPC recommends checking that you can secure the required mortgage protection insurance.

This can become more relevant as borrowers get older or if health circumstances have changed since the original mortgage began.

Do not cancel existing protection before understanding what the new lender will require and whether replacement cover is in place.

The cheapest interest rate is not useful if an essential part of the refinance cannot be completed.

What about the Mortgage Interest Tax Credit in 2026?

The Mortgage Interest Tax Credit has been extended to 2026.

Revenue says that, for qualifying 2026 claims, the credit is based on 50% of the increase in qualifying mortgage interest paid in 2026 compared with 2022, with the relevant interest amount capped at €3,125.

That produces a maximum 2026 credit of €625 per residence, subject to the qualifying rules and the claimant having sufficient Income Tax liability.

Revenue: Mortgage Interest Tax Credit.

A lower mortgage rate can reduce the amount of interest you pay. That is normally a financial benefit, even if it also changes the calculation of an interest-based tax credit.

Do not keep a more expensive mortgage simply to preserve a tax credit without doing the full arithmetic.

The CCPC example points in the same direction

The CCPC gives its own switching illustration:

• €200,000 mortgage balance;
• 20 years remaining;
• current rate 4.5%;
• alternative rate 3.5%.

Its example gives repayments of roughly €1,265 versus €1,160 a month and a total saving of about €25,300 over the remaining term, before considering switching costs.

Those figures are consistent with the same amortisation principle used in the Compound calculators.

CCPC switching guide.

A practical five-step switching test

1. Get your current mortgage facts

You need:

• outstanding balance;
• current rate;
• remaining term;
• date the current fixed period ends;
• current break fee, if any;
• and current repayment.

Do not estimate these if your lender can provide them.

2. Ask your existing lender for its alternatives

A product switch with your current lender may deliver much of the saving with less friction.

Record:

• new rate;
• fixed period;
• repayment;
• fees;
• and what happens after the fixed period.

3. Compare other lenders

Use the same mortgage balance and, initially, the same remaining term.

That isolates the effect of the rate.

Only then test a longer or shorter term.

4. Add every switching cost

Include the actual quoted:

• legal cost;
• valuation cost;
• BER cost if applicable;
• break fee;
• administration cost;
• mortgage-protection cost difference;
• minus any genuine cashback or lender contribution you will receive.

5. Calculate break-even and total cost

You want at least three outputs:

• monthly payment difference;
• months until switching costs are recovered;
• total scheduled cost over the comparable term.

The Mortgage Switch Calculator calculates all three.

Switching and overpaying can work together

A useful option is to switch to the cheaper rate without spending the monthly saving.

In the main example, the payment falls from about €1,581.62 to €1,449.90.

Instead of reducing the household mortgage budget, you could choose to keep paying roughly the old amount, subject to the new mortgage’s overpayment rules.

That directs approximately €132 extra toward the balance each month.

The potential result is:

• a cheaper interest rate;
• plus faster principal repayment.

Use the Mortgage Overpayment Calculator to model that second step separately.

Always check the overpayment allowance on a fixed-rate product before assuming unlimited extra repayments are permitted.

For a deeper worked example, see What would an extra €100 a month do to your mortgage?.

So, when is switching worth investigating?

The arithmetic becomes more interesting when several of these are true:

• your current rate is materially above available alternatives;
• the balance is still substantial;
• many years remain;
• the break fee is low or the fixed period is ending;
• you expect to keep the mortgage beyond the break-even period;
• your LTV or BER has improved;
• and the alternative does not rely on extending the term to manufacture a lower monthly payment.

But none of those conditions produces an automatic yes.

A mortgage switch is a refinancing decision. Eligibility, insurance, fees and future-rate assumptions all matter.

The number that matters most

The best mortgage is not necessarily the one with:

• the lowest advertised rate;
• the biggest cashback;
• or the smallest monthly repayment.

For a switch, the useful question is:

After all costs, how much better off am I over the period that actually matters to me?

Run that comparison using your own balance, rates, terms, fees and cashback in the Mortgage Switch Calculator.

Then test the underlying repayment separately with the Mortgage Calculator and see what happens if you keep some of the saving going toward the balance with the Mortgage Overpayment Calculator.

From buying the home to managing the mortgage

Switching is only one stage of the ownership lifecycle. Buying a Home in Ireland 101 covers the full process from deposit and mortgage approval through bidding, conveyancing, drawdown, closing and the first years of ownership.