The IRS filing period is coming up soon. Until then, it is necessary to validate the invoices on the e-faturas portal and then fill out the declaration very well so that there are no surprises.

Did you know that workers with mortgages can request from the beginning of the year to withhold a smaller amount each month from the IRS?

IRS: The analogy is (apparently) little used...because it's recent
The state budget for 2023 (OE2023) allows, during this year, to reduce the IRS withholding tax on dependent workers to a step rate directly lower than that corresponding to the monthly wage and family situation applicable to the relevant earner.” According to the document:
1 - In 2023, the IRS Class A income withholding tax is reduced to a step rate that is directly below that corresponding to the monthly wage and family situation applicable to the relevant income earner, pursuant to the order referred to in Section 99.º-F of the IRS code. , with the following cumulative conditions checked:

a) The taxable person is the debtor of a housing loan whose objective is his permanent residence.  And
b) The taxable person shall receive a monthly bonus not exceeding 2,700 (Euros).


2 - For the purposes of the provisions of the previous figure, the taxable person shall inform the entity that owes the income, at a time before it is paid or made available, of the option to reduce the expected withholding tax, through a statement attached through the items that are indispensable for verification of the above conditions, as well as any other relevant information Tax related later.
The perception of the Charter of Certified Accountants and Deco is that this procedure is little used.  Speaking to Lusa, Paula Franco of ACCA admitted that the fact that this procedure is so little used is mainly due to the fact that it is a recent procedure and also not well known, and also because of the fear of paying less per month.  They may lose the payment or have to pay tax on the annual settlement.