The offset account materially reduces effective interest exposure and payoff time.
Before vs after
No offset interest
€0
standard mortgage
Offset interest
€0
with offset account
No offset payoff
0 yrs
standard mortgage
Offset payoff
0 yrs
with offset account
Interest saved
€0
Months saved
0
5-year balance reduction
€0
Offset balance view
Current mortgage balance
€0
Current offset balance
€0
Effective mortgage balance
€0
Monthly net savings flow
€0
Projected 5-year offset
€0
5-year mortgage effect
Standard balance after 5 years
€0
Offset balance after 5 years
€0
Interest saved after 5 years
€0
Extra mortgage payment used
€0
5-year balance advantage
€0
Scenario comparison
No offset
€0
interest
Current offset
€0
interest
Enhanced offset
€0
interest
Cal insight
Enter mortgage and offset account assumptions to see how the offset balance reduces effective interest cost and speeds up payoff.
Offset savings structure
No offset interest
Offset interest
Interest saved
Scenario table
Scenario
Total interest
Payoff time
5-year balance
Effective balance now
5-year outlook
Year
Offset balance
Standard mortgage balance
Offset mortgage balance
Interest saved
What this calculator does
This calculator estimates how an offset mortgage account lowers interest by reducing the balance on which interest is charged. It compares a standard mortgage path with an offset-account path under the same payment assumptions.
Interest saved = standard mortgage interest − offset mortgage interest
Why offset matters
An offset account can reduce interest without locking the savings away in the same way as a direct lump-sum prepayment. It can provide flexibility while still improving mortgage efficiency.
How to use it properly
Use realistic average offset balances, not only peak balances. If you expect regular deposits and withdrawals, include both so the projected interest saving remains grounded.
Frequently asked questions
An offset mortgage links your savings to your mortgage so interest is charged only on the mortgage balance minus the linked savings balance.
Not exactly. A lump-sum payment reduces the loan balance permanently, while offset savings usually remain accessible but reduce interest while held in the linked account.
Often the required payment stays the same, and the benefit appears as lower interest and faster principal reduction rather than a lower scheduled payment.
The effective mortgage balance rises again, so interest savings usually fall.
It depends on flexibility needs, lender rules and your cash reserve preference. Offset can preserve access to cash while still reducing interest.
No. It is an estimate tool. Official lender calculations remain the authoritative source for your specific product.