The net amount may vary due to the Irpef adjustment and contributions, also influencing the calculation of severance pay. The Christmas Bonus is proportional to the months worked and the employer recovers it as compensation
In December the paycheck is enriched with a thirteenth salary and, for those who are entitled to it, the Christmas bonus of 100 euros (tax-free, paid with the thirteenth salary), but the net amount may vary due to the Irpef adjustment and contributionsalso influencing the calculation of TFR (the severance pay). The Christmas Bonus is proportional to the months worked and the employer recovers it as compensationwhile the severance pay is calculated on the actual salary, excluding bonuses, but the final amount depends on the total for the year (you can read a guide here).
The Irpef adjustment
December, as we know, is the month of the Irpef adjustment, which inaugurates the operations at the end of 2025 involving companies and employees. For this reason, the Irpef actually due will be calculated on the basis of the wages actually paid. The effect is variable: if lower withholding taxes have been applied to the pay slips for individual months, then the salary will undergo a necessary cut to recover the difference due. On the contrary, in the case of withholdings applied at a higher rate (or bonuses not recognized) the paycheck will be positively affected by the effects of the adjustment.
The fringe benefit threshold
It is with regard to the differentiated limit relating to fringe benefits that employers they will be asked to carefully evaluate whether the expected threshold is exceeded. For 2025, fringe benefits retain the exemption regime up to the following thresholds. If the maximum limit not subject to taxation is exceeded, the entire amount disbursed will be included in the calculation of taxable income for both IRPEF and IRPEF purposes. and as regards the contributions due.
The Irpef bonus account
The end-of-year calculations also include operations relating to the actual determination of taxpayers benefiting from the Irpef bonus of 100 euros. The end of year balance allows you to determine the actual amount due in light of the income actually paid during the year. The “early” disbursement of the bonus on the pay slip comes into account every year with the risk, therefore, of reimbursement in the event of exceeding the thresholds for recognition. If the adjustment operations cause the income limit for the recognition of the 100 euro bonus to be exceeded, the withholding agent will have to recover the amountin a maximum of 8 installments of the same amount in the case of sums owed exceeding 60 euros.
December 24, 2025
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