i think they'd get some sort of.. allowance or something like that? like wardens do? nothing to write home about, but enough to support themselves and a family, since we've seen married templars and such.
Other way around, actually. Templars get a stipend, but it's so small that it's not enough to support a family. This is where the "Templars need permission to marry" rule comes from - they need permission because the Templar's prospective spouse must be able to support the family on her/his own. Aveline and Westley were likely allowed to marry because she was in the King's army, and could support them both + any family they might have one day.
Templars don't need to earn much money in any case, since they're not allowed to have personal possessions anyway (Cullen was breaking the rules with his lucky charm), and everything else (armor, weapons, lyrium, housing and food etc) is provided by the Chantry. Nothing much left to spend on.