Upon reading your tax notices, if you see an oversight or an error in your declaration of income in 2017, you can still correct it.
And as such, if you are an online tax filer, you can proceed to correct it directly online.
This service, accessible through your personal account, is open until the 18th of December 2018.
After this date, you must resort to the claim. A claim is possible until the 31st of December 2020 for the declaration of revenues in 2017.
Taxpayers can rectify their revenues, their charges, their reductions and credit taxes or the relative elements to real estate fortune tax (IFI), but not their address, their civil status or their family situation (marriage, “PACS”…).
And if you simulate withholding tax
Doubt is no longer allowed: withholding tax on review will begin well next January.
Also, it will belong to the employers to deduct the tax on the consideration of their salaries and to reverse it to the French IRS.
A practice far-off from their business management and one therefore necessary to anticipate.
To do this, employers can, on salaries paid from the 1st of September to the 31st of December 2018, simulate withholding tax.
And this, using, for each employee, the tax that is transmitted to them by the administration through the business report following the DSN filed at the month of September.
Informative for employees, their payment sheet (or an annex or other equivalent document) will contain all or part of the following: the amount of the remuneration on which the tax will be calculated, the tax of applied withholding the amount of the tax that will be retained and the sum that which would be paid to them after withholding.
No sum will be really levied on the remuneration of employees nor given to the fiscal administration before January 2019!