Termination Pay Tax Withheld

Hi,

I am doing a final pay for one employee. I calculated the tax as per ATO guidelines. But the tax witheld amount i calculated is more than three times the tax MYOB is suggesting. Is this correct?

He has 41.783 hours unused annual leave calculated at $25 per hour. which is gross $1227.38. On Myob the tax for this is $104. But my calculation shows $364 tax amount!!! which is way too high.

His normal gross pay is $1900 and normal tax on that is $254. can anyone do the calculations for me and reassure me before I process his final pay?

Thank you