When does refinancing a mortgage pay off?
Moving your mortgage to another bank can save hundreds of złoty a month – or cost more than it saves. How to calculate it properly.
Kready · 2026-08-18
Refinancing means taking a new loan in another bank (or the same one) to repay the current mortgage – ideally on better terms.
When it's worth considering
- your margin is high compared to today's offers,
- you have a fixed rate that is ending or much higher than current fixed rates,
- your LTV has fallen – you've repaid part of the loan or the property is worth more,
- your income has grown or your residence status improved, so more banks accept you.
The costs of switching
- property valuation,
- court fees for the new mortgage entry and deleting the old one,
- a possible early repayment fee in the old bank,
- sometimes a commission in the new bank.
How to calculate
- Compare your current installment with the new one.
- Add up the switching costs.
- Divide costs by monthly saving → months to break even.
If you break even within a year or two, refinancing usually makes sense.
Watch out for the term
A lower installment may come from a longer term – then you might pay more in total. Our calculator shows both the monthly and total difference.
Choose "Refinance my mortgage" in the calculator – enter your balance and current rate or installment.