Calculation of the taxable base after the levelling reserve (box 01330)
The entities that apply the levelling reserve under the terms of article 105 of the LIS, must enter in the box  "Taxable base after levelling reserve" on page 14 of form 200, the amount resulting from applying to the taxable base (box ) on page 13 of form 200, the adjustments included in boxes  and  "Levelling reserve" on page 13 of said form corresponding to the application of said tax incentive, making the following calculation:
box  =  +  -  =  +  - .
A tener en cuenta:
If the taxable income entered in box  is positive, it may be reduced by 10 per cent by the application of the equalisation reserve up to a maximum limit of 1 million euros.
For these purposes, only if box  is positive, the box  of negative adjustment for equalisation reserve may have content and its amount will be 10 per cent of the base with a maximum limit of 1 million euros.The remaining amount, if any, remains to be reduced in future periods.
If the tax base entered in box  is negative, it will not be possible to reduce the tax base by applying the equalisation reserve, as the equalisation reserve can only be applied when the tax base is positive.
However, if in previous positive periods the entity has reduced its positive tax base by the application of the equalisation reserve, this amount must be added to the negative tax base of the tax periods ending in the 5 years immediately following the end of the tax period in which the reduction is made, up to the amount of the reduction.
In this way, only if box  is negative, the box  of positive adjustment for equalisation reserve may contain and its amount shall be the value of box .
The box  can be completed by entities that do not have the status of small entities, as they may have lost this status when they add to their taxable base the amounts that were reduced by the application of the equalisation reserve when they were considered as small entities.Therefore, these entities, even if they do not have the status of small entities, must also make the calculation of box  "Taxable income after equalisation reserve".
On the other hand, box  can only be completed by small entities, as the reduction of the tax base by application of the equalisation reserve is only possible for entities that have this status (previously, these entities must have ticked box  "Incentives for small entities (Chapter XI, Title VII LIS)" on page 1 of form 200).
Although boxes  and  have no content, box  must be completed.In this case, the amount in box  shall be the same as the amount in box .