In general, everybody can earn €36,400 at the 20% band with the balance at the 41% rate
One spouse can transfer a maximum of €9,000 of their 20% band to the other spouse.
In your case, where your wife earns €32K, she has unused 20% band of €4,400 (€36,400 minus €32,000)
Because you pay tax at the 41% rate, you should transfer the balance of your wife's 20% band (ie the unused €4,400) to yourself.
The effect of this is that €4,400 of your salary will now be taxed at the 20% rate instead of the 41% rate.
Net saving to you of €924 per annum (€4,400 x saving of 21%) or €77 per month
IMO if you can manage without this €77 per month, I would leave things as they are and send in a tax return each year (with medical expenses, bin charges, etc) around this time and you should get a nice cheque back from Revenue for approx €1,000 which is always handy at Christmas
Each to their own though.