Is it ethical to invite a student to apply for a job through my spouse? In my field, computer science, employers offer referral bonuses of a few thousand dollars to employees who refer successful job candidates who go on to work at that company. My spouse works at a company that an alumnus would like to apply to. So do several alumnae and a former professor who has taught that student. I used to work there too.

Is it ethical for me to tell the student (truthfully) that, if he applies through my spouse and gets hired, we will donate the bonus to the college? I would also tell him (truthfully) that I would submit an equally enthusiastic recommendation letter and help him prepare for interviews no matter who he chooses to refer him. 

My ethical concern is that the student might feel pressured by my implying I would like him to apply through my husband and fear that I would not help him as much if he did not. I could partly alleviate that concern by writing the recommendation letter first and giving it to the former professor at the company to submit after anyone has referred the candidate. Is that enough?

Update

I asked an alumna at the company (rather than my husband) to refer the student and donate any referral bonus. She cheerfully agreed and coached him on interviewing. The candidate had no problem with being referred by an alumna (or by my spouse) and appreciated the coaching, although he ended up working for another company. 

I think going through someone other than my spouse reduced the appearance of a conflict of interest all around (including to the company, to which I would have submitted a letter of reference).
(Disclosure: I'm not a professor.)

I don't personally see any ethical concerns SO LONG AS you indicate clearly (as you said you would do) that the recommendation letter will be equally strong regardless of whether or not the student applies through your spouse. Under those circumstances, I'd call this "networking," not "bribery" or "coercion". 

The idea you proposed of writing the letter first and then informing the student seems like a nice way of ensuring that the student knows you've written a strong letter. There is the possibility that the student will still feel pressured, of course -- "if I don't say yes, then my professor will send a second contradictory letter" -- but assuming you have a positive relationship with the student, that seems unlikely.