In 2018 my client's adjusted gross income was $211,755, his taxable income was $190,619 and his taxes for that year where $25,923.

In 2019 the same client's adjusted gross income was $229,823, his taxable was $207,929 and his taxes are $47,130 a $21,250 increase over 2018.

I need to know what cause the difference.

Thanks