No worries
Just to give you an idea of the figures
If you don't transfer anything to your husband, you will have a PAYE bill in October 2012 of roughly €2,942, calculated as:
€28,000 x 20% = €5,600 less personal credit of €1,650 = €3,950
Your remaining 20% band of €4,800 will be used to reduce your tax bill because it will be utilised against your husband's income when you do you tax return and you will reduce your tax bill by 21% of this = €4,800 x 21% = €1,008
Total tax bill will be €3,950 - €1,008 = €2,942
If you give all your tax credits and cut-off to your husband then his take home pay will increase by €3,540 over the course of the year (€68.08 per week or €295.00 per month)
However your tax liability next October will now be a whopping €6,482, calculated as
€23,800 @ 20% = €4,760
€4,200 @ 41% = €1,722
Total PAYE payable of €6,482
No tax credits to reduce this because your husband has them
You should note that the ACTUAL final PAYE paid is the exact same but it's a cash-flow issue
I have ignored PRSI & Levies because there is no cash-flow issue with them.