Why you might owe additional income tax after changing jobs, even if employers withheld everything correctly

Changing jobs during a calendar year can lead to unexpected tax notices from the tax authorities. Even if each employer correctly withheld income tax from payments, the total annual income may exceed the threshold for a standard tax rate or trigger a recalculation under a progressive tax scale. The issue arises because tax agents calculate taxes in isolation, without visibility into an employee's income from other companies. Consequently, at the end of the year, the tax office aggregates all income and identifies a shortfall that the taxpayer must pay independently. The article on Habr details the mechanism behind such debts, explains the logic of tax recalculations, and provides recommendations for those who have changed jobs. Understanding these processes helps avoid penalties and ensures timely tax filing, accounting for the nuances of dealing with multiple tax agents within a single reporting period.