Two payslips with same employer

[#1]

Hi there,
Last FY I received two Pay summaries from my one govt employer. I was seconded to another role part time but still had the same bosses and only working a total of a 40 hour week. As a result of this I received two summaries at end of year and was met with a hefty tax bill and did not utilise any voluntary tax payments. So my question is, can I dispute this bill with the ATO in order to reduce my bill as I believed I was still with the same employer?
Many thanks.

[#2 · Accepted solution]

@Dougie 

You are taxed on your total 'taxable' income for the year.

If you have paid too much tax then any surplus will be refunded to you when you lodge your tax return.

The 'Tax-Free Threshold" applies to your total income not per job.

If you let me know the total paid and total tax, I can work it out for you.