The State-owned banking group said its rate will come down by 0.25pc from start of July.
However, the group said the new lower variable rates only apply to AIB customers, and there has been no reduction announced for EBS and Haven mortgage holders.
AIB is also said it is now offering a new €2,000 contribution towards the professional fees for customers who switch to it.
The latest cut in its variable rate will see reduced to 3.40pc for residential customers, both new and existing ones.
It will mean annual savings of €320 for someone with a €200,000 mortgage to be paid back over 25 years.
Some 76,000 mortgage account holders will benefit from the new lower variable rate when it comes down in July, the bank said.
This is the fourth time AIB variable rates have come down in the last 18 months.
The new Enda Kenny-led Government has made reducing variable rates a key priority. Other banks will now be forced to react to the rate cut.
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