Use the calculator to estimate your monthly repayments — try different loan amounts, terms and interest rates and watch what each change does to the payment. It’s an illustration rather than a quote, but it’s the right place to start.
When you want real figures, our advisors compare products from across the market — including lenders who understand the Northern Ireland market — and confirm exactly what you could borrow and what it would cost.
A mortgage payment has two jobs: covering the interest on what you owe, and gradually repaying the loan itself. Three inputs drive the number — the amount borrowed, the interest rate and the term. Small changes to any of them move the monthly figure more than most people expect, which is exactly what the calculator above lets you test.
To give the numbers some local context — here’s the monthly repayment on common NI borrowing amounts over a 25-year term:
| Borrowing | at 4.0% | at 4.5% | at 5.0% |
|---|---|---|---|
| £150,000 | £792 | £834 | £877 |
| £180,000 | £950 | £1,000 | £1,052 |
| £220,000 | £1,161 | £1,223 | £1,286 |
Illustrations only, repayment basis. The rate you’re offered depends on your deposit, credit profile and the products available at the time.
Term: stretching £180,000 at 4.5% from 25 to 30 years trims the payment from about £1,000 to £912 a month — but adds years of interest. Shortening to 20 years raises it to about £1,139 and saves thousands overall.
Deposit: lenders price by loan-to-value. Best rates typically sit at 60% LTV, with steps at 75% and 85% — if your deposit nudges you over one of those thresholds, your rate band improves.
Rate type: a fixed rate locks your payment for the deal period; a tracker moves with the Bank of England base rate. Which suits you depends on how much certainty you want — something we talk through rather than guess.
The calculator answers “roughly what would it cost?” The next question — “what will a lender actually give me?” — needs an Agreement in Principle. It’s free, usually quick, and makes you a credible buyer when you make an offer. Want the full borrowing picture first? Read our guide to how much you can borrow in Northern Ireland, the true cost of buying a house in NI, and check the tax side with our stamp duty calculator.
Ready for real numbers? Book a free appointment with one of the team — whole-of-market advice from our Lisburn Road office, for buyers right across Northern Ireland.
Your home may be repossessed if you do not keep up repayments on your mortgage.
Your repayment is based on three things: how much you borrow, the interest rate, and the term. Each payment covers that month’s interest plus a slice of the loan itself, so on a repayment mortgage you owe less every month — and by the end of the term you owe nothing.
Use the rate you’ve been quoted, or a realistic middle figure if you’re just exploring — many borrowers in 2026 are fixing somewhere in the 4% to 5% range depending on deposit and product. Rates change constantly, so treat the result as a guide and let us confirm real products for your situation.
As a rough rule, lenders offer around 4 to 4.5 times your annual income, but the real answer depends on affordability — your outgoings, credit commitments, dependants and the lender’s own criteria. Some professions can access enhanced multiples.
A longer term lowers the monthly payment but costs more in interest overall. Borrowing £180,000 at 4.5% costs about £1,139 a month over 20 years, £1,000 over 25 years, or £912 over 30 years — same loan, very different monthly commitment.
Most buyers put down between 5% and 20%. The bigger your deposit, the lower your loan-to-value band — and lenders price their best rates at 60%, 75% and 85% LTV thresholds, so crossing one of those lines can noticeably cut your monthly payment.
On a repayment mortgage you pay interest plus capital, so the debt is cleared by the end of the term. On interest-only you pay just the interest, with the full loan still owed at the end — it’s mainly used for buy-to-let and needs a credible repayment plan.
No — it estimates the mortgage payment only. Budget separately for buildings insurance (a lender requirement), any stamp duty, legal fees, valuation and product fees. Our stamp duty calculator covers the tax side.
Most fixed deals let you overpay up to 10% of the balance each year without penalty, which shortens the term and cuts total interest. Overpay beyond that during a fixed period and an early repayment charge may apply — always check the product terms.
NI borrowers access the same UK-wide lenders and products as everyone else, plus some local lenders who know the NI market well. Because average property prices here are lower than the UK average, the same salary often goes further.
Get an Agreement in Principle — it turns an estimate into a lender-backed figure and puts you in a stronger position with estate agents. Book a free chat and we’ll review your affordability across the whole market.
