Taxability of Interest on EPF after retirement

Hi,

If an employee has resigned from the company, then how would the interest on EPF be taxable? I've read that it is exempt upto retirement. But does it become taxable after retirement? If yes, then is it to be offered every year on accrual basis or can be offered in year when EPF is withdrawn (i.e. on receipt basis)?

Another Variation in the question;

If the employee was in employment for half of the Financial year, then would the taxability logic/premise change in any way?

Thanks in advance.