The best interest rates on Instant Access Deposits in Ireland:
Rates checked March 10th 2017
Leeds Building Society (Ireland) 0.65% (2nd and subsequent withdrawals need 30 days notice . Min balance €2500 )
KBC Smart Access 0.6% Min €3000 Max €100k
Nationwide UK (Ireland ) 0.51% (Min 2k € Max 2m) (6 free withdrawals a year)
RaboDirect 0.4% (online only). Min €1 Max €50k
If you can put aside a regular amout each month – you will get better rates on a regular saver account. See here for the Best Rates on Regular Saver Accounts.
Usually you will also get better interest rates if you are willing to tie up your lump sum for a fixed term… see the Best 1 Year Fixed Deposit Interest Rates and the Best Rates on Fixed Terms Up To Five Years