How does income and / or payroll tax increase the marginal cost of labour?

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https://www.sapling.com/7980776/definition-distortionary-taxes

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Income taxes are distortionary because they increase the cost of hiring an employee, but don't affect other production costs such as equipment.

I am not sure whether they do mean income taxes or payroll taxes, so if we include both taxes, how can they increase the marginal cost of labour? Is this because they incentivise the employee to seek better pay as a means of mitigating the impact of such taxes on their wages?