Calculator of taxes

[SWSUSA]

Hi! How it is possible to add the calculator of taxes on a forum? Where it is possible to take these scripts? Thanks!

Привет! Как можно добавить калькулятор налогов на форум? Где можно взять эти скрипты? Спасибо!

[MarkFL]

I would likely write some javascript to do the job, and then use a plugin to add the needed HTML and script to the desired template.