Those who have already done and presented the declaration of the Rent
2018 (and they have gone to return) Maybe you should be asking how long it takes Treasury to return the money.
Normally, the operation usually takes no more than a month. Since the declaration is filed, the Tax Agency will return the money in about thirty days. Of course, if the amount to be returned exceeds 3,000 euros surely the process will be extended.
The AEAT has a maximum period of six months from the end of the period of voluntary filing of the IRPF
In any case, the AEAT has some responsibilities (same as taxpayers): it has a maximum of six months from the end of the period of the voluntary filing of the IRPF to enter the corresponding amount to those people to whom it has left to return.
In the hypothetical case that does not meet the deadline, the Treasury will proceed to compensate affected taxpayers with interests that are around 4% and that will be applied proportionally to each day of delay. In addition, the action will be ex officio: no need to make any kind of request.