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Practical Handbook for Companies 2021

The method described in article 40.2 of the LIS

The calculation base will be taken as the full tax liability for the last tax period for which the tax return deadline expired on the 1st day of April, October and December, less deductions and allowances, as well as withholdings and payments on account corresponding to that period, provided that the tax period has been of annual duration.

The percentage of 18 per cent shall be applied to this calculation base,, obtaining as a result the amount of the corresponding instalment payment.

When the last tax period for which the deadline for filing a tax return has expired is less than one year , the proportional part of the tax liability of previous tax periods must also be taken into account, until a period of twelve months has been completed.