For business property tax, the increase provided for in 1 of Article 1731 applies:
1° To sums mentioned on a tax assessment which have not been paid within forty-five days of the date on which the assessment was levied, without this increase being applied before 15 September for taxes assessed in respect of the current year;
2° To advance payments which have not been paid by the 15th of the month following the month in which they became due.
The 1° does not apply to sums already increased in application of this 2°;
3° To the entire amount of the advance payment for which the taxpayer has dispensed with payment when, following the assessment of the roll, the payments made are inaccurate by more than one tenth.
However, no increase is applied when the difference is the result of a law that came into force after the date on which the declaration provided for in the fourth paragraph of article 1679 quinquies.