I think this is the piece you need
Income from spouse's/civil partner's/cohabitant's work
If your spouse/civil partner/cohabitant works it can affect your Disability Allowance.
Since 26 September 2007, your spouse/civil partner/cohabitant's weekly earnings are assessed as follows:
Weekly earnings are gross earnings less
PRSI, superannuation and union dues.
€20 per day (up to a maximum of €60) from work is deducted from your spouse/civil partner/cohabitant's average weekly earnings and then 60% of the balance is assessed as weekly means. The weekly means is then deducted from the combined total of your personal rate of Disability Allowance and the maximum Increase for a Qualified Adult.
Applying the above to your situation I think it works like this:-
Wife earns E200.00
Deduct E20.00 = 180.00
60% of 180.00 = 108.00 = weekly means
Deduction from combined Dis.Allowance = E108.00
Income:-
Disability allowance (E188.00 + E124.80) less E108.00 = E204.80
Half-rate Carers = E102.00
Wife's work = E200.00
Sorry my post crossed with gipimann