Indirect wages constituted by family allowance......

http://books.google.co.uk/books?id=fw5CmayAGpQC&pg=PA5&lpg=P...

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Note added at 15 mins (2012-06-29 09:12:10 GMT)
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Trabajadores usually receive a wage rather than a salary in English

*Frankly, I think this would make more sense in English if the term "represented/constituted/was tantamount to an indirect contribution to a higher standard of living, as it freed them from ..." However, I would query the author/client about such an interpretation.

Another idea. Although it says "salario", I'd get away from direct words like "salary" or "wages" and talk in more general terms about "remuneration" or "compensation", which are not necessarily monetary. "Indirect compensation" is a common term when referring to fringe benefits:

"Indirect compensation refers to non-monetary benefits offered and provided to employees in lieu of the services provided by them to the organization. They include Leave Policy, Overtime Policy, Car policy, Hospitalization, Insurance, Leave travel Assistance Limits, Retirement Benefits, Holiday Homes."
http://payroll.naukrihub.com/compensation/indirect-compensat...

But I would personally prefer "remuneration", which is closer to "salario":

"remuneration
Direct or indirect compensation for services performed. wages are a form of direct remuneration, while fringe benefits are a form of indirect remuneration."
Barron's Business Dictionary
http://www.answers.com/topic/remuneration

I think "constituted" is fine, but "amounted to" is also OK and I offer it as an alternative (John's suggestion of "tantamount to" is also possible, of course).

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Note added at 5 hrs (2012-06-29 14:24:51 GMT)
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Having thought about this a bit more, I still think the literal translation, "indirect salary" or "indirect wages", is unsuitable in English. Education or training is a non-salary benefit and I don't think it would ever be described in English as "indirect salary/wages". At the very least you would have to attenuate it by using something like "equivalent to indirect salary", or something like that.

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Note added at 5 hrs (2012-06-29 14:28:05 GMT)
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"Indirect salary" means benefits that translate into a financial terms, use of a car, health insurance, things like that: things that save the salaried person some expenditure. I don't think education falls into this category; the benefit is real but not quantifiable enough to be described like this.