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# How can I check why my tax result changed?

If your tax result is different from the previous year

* Compare your **taxable income** on Form 100 for each year (page 20)
* Review any changes in **deductions or tax credits**
* Check the **tax advances** entered in your taxx.lu account

By reviewing these factors, you can often pinpoint the reason for changes in your **tax liability** or **tax refund**.