8.12.1.2. How to make the supplementary declaration

The new (complementary) declaration will contain all the data that must be declared; To do so, you must incorporate any data that you have not entered, modify any incorrect data, and maintain the correct data entered in the original declaration.
Additionally, you will have to complete the "Supplementary declaration" section.

If the supplementary declaration results in a refund amount lower than that requested in the previous declaration and this refund has not been agreed by the Tax Agency, only box 107 will be checked.

Otherwise, you will check the box "Supplementary declaration for reasons other than those in the previous box" indicating the box or boxes that correspond to the type of supplementary declaration you are going to submit:
- Box 108. If you have received arrears of work income after filing the previous declaration for this year
- Box 109. If you have received amounts for the floor clause, when, in this fiscal year, you have recorded them as a deductible expense from real estate capital gains, or economic activity.
- Box 110. When you must file a supplementary declaration for this year due to having lost your status as a taxpayer due to a change of residence abroad, except for taxpayers who are in the case of box 111.
- Box 111. In the event of a change of residence to another state of the European Union, and it is decided to impute the pending income as it is obtained.
- Box 112. Supplementary declaration for change of residence abroad, which generates capital gains.
- Box 113. Supplementary declaration for the loss of resident status, in this fiscal year, of the partner to whom the special regime for the exchange of securities or mergers and demergers provided for in the Corporate Tax Law has been applied.
- Box 114. Complementary if there has been a change of residence to another Autonomous Community and it has no effects.
- Box 115. When, in this exercise, early disposition of consolidated rights of social security systems has been made.
- Box 116. When the owner of the protected assets of persons with disabilities has disposed of the contributed assets or rights in advance.
- Box 117. When the conditions necessary to apply the exemption for reinvestment in primary residence and newly or recently created entities, declared in this fiscal year, have not been met.
- Box 118. When the conditions assumed in the application of the exemption for reinvestment in life annuities have not been met, or when the economic rights derived from those life annuities have been fully or partially anticipated.
- Box 119. When the deadline for holding the shares delivered to the workers has not been met for at least three years.
- Box 120. When you declared a severance or termination compensation exempt in this fiscal year, and subsequently the exemption is lost.
- Box 121. When homogeneous assets, securities or shares are acquired that prevent the capital loss initially recorded in the declaration for this fiscal year from being computed.
- Box 122. When the reason for the supplementary declaration is different from those reflected in boxes 108 to 121.
Result of the previous self-assessments corresponding to this year:

In addition, the amount to be paid from the previous declaration must be entered in the appropriate box, or if the original declaration resulted in a refund (except when box 107 was checked), the amount of the refund provided that it has already been made by the Tax Administration.

Once the differential rate resulting from the new liquidation has been determined, the amount entered in the original declaration will be subtracted from it, if it was positive, or the refund received will be added, if it was a refund.

The result thus obtained is the amount that must be paid as a result of the supplementary declaration.

The calculations are performed by the program and will be recorded in section "O" "Regularization" of the declaration and in the income document (form 100).

If the supplementary return is for a joint declaration , must make the necessary changes to each of the individual declarations and then complete the "Supplementary declaration" section in the joint declaration as set out above.