Be Responsive, But Don't Commit Early On
Jumping into early salary discussions is a clear indicator that you place high priority on rupee rather than being a good fit for a company’s culture. But if in case the recruiter brings the salary related question then it is always better to change the subject and focus on showcasing your entire personality.
Probably you can be diplomatic and say to the employer that, if I am a great fit, we can each work to treat each other fairly when it comes to determining a specific salary for this job.
Tackle 'This Is What We Can Afford Right Now' Deftly
In case an employer really wants to hire you but has limited resources, he/she may come with the above mentioned excuse. But if you are in a dire straight to get the job then you can ask, whether there are other options like performance based bonus or you could even ask if there is any measurable results that would improve your bottom line and increase your earnings.  
Most importantly, get any incentive pay agreements in writing during the hiring stage, so your employer is committed to following through.
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