An urgent investigation has been launched after a software error was discovered in an online form used by divorcing couples in England and Wales.
The error on the Ministry of Justice website had been present since April 2014 but has only just been uncovered.
The issue with the form, which records couples' financial details, could mean thousands of financial settlements are based on incorrect calculations.
Most law firms do not use these forms though but their own software.
The mistake was in Form E on the Ministry of Justice (MoJ) website and it was rectified earlier this month. Not all couples use the online form, as some do submit their calculations on paper. The mistake could mean some of those who have settled divorces in the past 20 months could have to re-open negotiations.