If you are already on joint/aggregated married taxation then things should sort themselves out as far as I know. If necessary contact Revenue to inform them of her redundancy and request an updated statement of tax credits to reflect the married couple/one spouse earning situation. Also if necessary request a P21 balancing statement at the end of 2008 in case you are owed anything. If she is going to mind a child at home full time then you may qualify for the home carer's tax credit. See the key post on common tax credits.