[michaelt]

Country A requires all employees to receive a default-opt-in pension.

Country B requires employers to register with tax authorities and deduct tax directly from the employee's salary.

Country C allows employees to buy childcare vouchers with their pre-tax salary.

Country D has a similar scheme, except for bicycles and it's a loan.

Country E considers private healthcare a taxable benefit-in-kind.

Country F has three different tax bands for employee stock options, depending on when they can be exercised.

Country G makes it mandatory to provide flexible working for new parents...

Of course in a lot of cases you can save on admin by being less tax-efficient, like by not participating in tax-efficient government incentive schemes.