What payment is your husband claiming? For most welfare payments, the first 20,000 of savings or capital are disregarded, although for payments from Community Welfare Officer, only the first 5,000 is disregarded. For Disability Allowance the first 50,000 is disregarded.
Therefore if your husband is claiming Jobseekers Allowance, and you have no other savings, then this income will not affect your payment.
For details on the means assessment of capital see here:
http://www.welfare.ie/EN/OperationalGuidelines/Pages/meansassess.aspx
Also, have you checked out to see if you are eligible for Back to Education Allowance? As the qualified adult on your husband's claim, you may be able to claim this. For details check here
http://www.welfare.ie/EN/Schemes/BackToEducation/Pages/btea.aspx
If you are eligible for Back to Education Allowance, you receive the full personal rate of payment (currently 188), instead of the qualified adult portion (currently 124.80). You also receive a 500 Euro cost of education grant at the start of the year. Bear in mind though that the Back to Education Allowance can affect any rent supplement if you receive that.
Anyway, something to check out.