There are two kinds of employers. One set of employers considers PF as an employee benefit. The second set of employers considers it as a statutory obligation. The former, being employee-friendly, will deduct 12% of the entire Salary/Basic salary and contribute the same amount to EPF and Pension fund. The second set of employers will deduct 12% of Rs 15,000 and contribute the same only. Again, there may be yet another kind of employer who will deduct the employees' share based on the actual basic salary, i.e., Rs 85,000 in your case, but will contribute the employer's share only on Rs 15,000.
The benefits:
1. The employee contributing on the full basic salary, i.e., Rs 85,000, will get a very good investment that will provide a reasonably good interest (which no other bank can provide you in the current scenario).
2. If the employer is also contributing his share on the actual salary, i.e., Rs 85,000, the employee MAY get the benefit of higher pension based on that higher amount of PF qualifying salary when he retires at the age of 58. If the review bench strikes down the verdict of the Supreme Court (and of course, the High Court of Kerala) which directs the EPFO to pay a pension based on the actual PF qualifying salary and restricts pension to Rs 15,000, then the employer's share on the difference amount will be credited to the employee's PF. This can be withdrawn by the employee along with his own share of contributions.
3. The employer restricting the PF contribution to 12% of Rs 15,000. The employee gets more take-home salary. But for an employee whose basic salary is Rs 85,000, this is nothing.
4. The employer who allows the employees to contribute on a higher salary than Rs 15,000 will favor the employee with tax benefits under 80CC. To that extent, the employer is employee-friendly.
Hope the above clarifies the matter.