Filling in Form 200
Only in the event that the amount in box  "Taxable income before application of the capitalisation reserve and offset of tax losses" is positive and different from zero, taxpayers may offset tax losses from previous periods, by entering in box  "Offset of tax losses from previous periods" on page 13 of form 200, as a reduction of the amount in box , the amount of the same that they decide to offset in this return.The amount entered in box  shall be the amount resulting from filling in the breakdown table "Detail of tax losses" on page 15 of form 200 explained at the end of this section.
For the calculation of the limit for offsetting tax losses, the amount of any write-offs or waivers resulting from an agreement with creditors unrelated to the taxpayer must not be taken into account.This amount should therefore be entered in box  "Rentas correspondientes a quitas por acuerdo con acreedores (art. 26.1 LIS)" on page 14 of form 200 (box  "Rentas corresp.a quitas por acuerdo con acreedores no vinculados cooperativas (a nivel cuota) (DA 8ª Ley 20/1990)" from page 14 of form 200 in the case of cooperative companies).
For the same reason, the amount of income corresponding to the reversal of impairment losses that is included in the tax base by application of the provisions of the sixteenth transitional provision of the LIS, should be entered in the box  "Income corresponding to the reversal of impairments (DT 16ª.8 LIS)" on page 14 of form 200 (box  "Income corresponding to the reversal of cooperative impairments (at quota level) (DT 16ª.8 LIS)" on page 14 of form 200 in the case of cooperative companies).
Therefore, and only in order to determine the amount in box  that will be affected by the application of the corresponding limitation established for the offset of negative tax bases, the amount appearing in the aforementioned boxes  and  (boxes  and  in the case of cooperative societies) shall be subtracted from said box .
A tener en cuenta:
For tax periods beginning on or after 1 January 2019, information on the net turnover for the twelve months prior to the start date of the tax period must be included on page 21 of form 200, for the purposes of determining the application of the limits on the offsetting of tax losses under the terms provided for in article 26 of the LIS.
For this purpose, when filling in box  a breakdown window will open (except in cases where the table on page 21 of form 200 has already been filled in), in which the taxpayer must indicate whether the net turnover during the twelve months prior to the start date of the tax period has been less than 20 million euros, at least 20 million euros, but less than 60 million euros or at least 60 million euros.The option marked by the taxpayer shall be transferred to the table "Net turnover for the twelve months preceding the date of commencement of the tax period" on page 21 of Form 200.
The option marked by the taxpayer will also be taken into account to determine the limits in the calculation of the accounting corrections derived from the application of article 11.12 of the LIS, the offsetting of negative quotas for cooperatives' losses and deductions for double taxation, so that once the table on page 21 of form 200 has been completed, it will not be shown again on other screens.
Note common to boxes  "Taxable income before application of the capitalisation reserve and offsetting of tax losses" and  "Offsetting of tax losses from previous periods":
If the amount in box  is zero or negative, under no circumstances may any amount of tax losses from previous tax periods be offset, and the figure zero ("0") must be entered in box .
If the amount in box  is positive, the amount in box  reduced, where appropriate, by the amounts entered in boxes  and , shall be limited to the amount in box .In other words, the application of box  may not result in a negative amount in box  "Taxable base" under any circumstances.
Completion of the table "Details of the offsetting of tax bases" (page 15 of form 200).
The reporting entity, unless it is a cooperative company, or entities belonging to a tax group that tick boxes  or  in respect of the year from which the tax losses pending offset at the beginning of the tax period being reported, must complete this table as detailed below:
The column "Pending application at the beginning of the period/g1enerated in the period" includes the amounts relating to the offset of tax losses generated in the periods 1997 to 2021, pending application at the beginning of the tax period.The row "Base offset year 2021(*)" only must be completed if the reporting entity has tax losses for another tax period starting also in 2021, but shorter than 12 months and prior to the tax period being reported.
In the case of companies whose tax period does not correspond to the calendar year or who are tax period party, negative tax bases from earlier periods pending offsetting must be included as from the year in which the financial year has begun.
The column "Applied in this assessment" should contain the part (or the whole, if applicable) of the corresponding amount from the column "To be applied at beginning of period/g2enerated in period", which is applied in the assessment of the tax period being reported.This column should not include the amount of the negative tax base that, where applicable, may have been generated in the tax period being declared (i.e. the box relating to the "Compensation of base year 2021") will not have any content.
The total of the column "Applied in this settlement" shown in box  shall be transferred to box  on page 13 of form 200.
In the column "To be applied in future periods" the positive difference between the amount of tax loss carry forward at the beginning of the tax period or generated in the tax period in the column "To be applied at the beginning of the period/g2enerated in the period" and the amount of tax loss carry forward applied in the assessment of the tax period being reported in the column "Applied in this assessment" should be entered.