Tax Software. Equa Via has been one of the leading independent producer of self assessment software since the legislation was first introduced back in 1997. A specialist developer of financial IT packages for more than a decade - with 250,000 units sold to date - Equa Via helped pioneer the use of the Internet to electronically file returns. The annual self assessment series - both professional and personal - have consistently been bestsellers since launch. Acclaimed by the leading PC titles, they have also been recommended by The Times and the Daily Mail.