Monday is deadline day for the filing of Swedish tax returns and many elect to use the option to declare online. The agency website has however proved ill-equipped to deal with the large number of people out in the eleventh hour.
"There is no technical fault, there are simply too many trying to declare at the same time," said Kay Kojer at the tax agency.
The problem experienced by those filing their taxes is encountered when people try to log in using their electronic bank identifications and is primarily affecting customers at Swedbank, Danske Bank and Handelsbanken.
Kojer pointed out that 450,000 people declared online in the penultimate day last year, which is typically the busiest of all despite declaration notices having been sent out back in March.
This year the agency expects the number of online declarations to have exceeded 500,000 on Sunday, of which a fifth log in using the electronic bank identification system.
Kojer was keen to stress that people still have the whole of Monday to file their declarations and advises that they just keep trying or use one of the alternative identification methods.