I have lost 1 of my 4 P60s. Does this mean that I will have problems when I claim Tax back before leaving UK?

Question

I have been a international student in UK for last 4 years and worked part-time and some full time jobs.

Answer 1

Your employer should still have record of your pay for each of the four years.  Call them up and see if they can issue a replacement P60 (which they are not obliged to).

If they say they can't issue a duplicate, ask for a "statement of earnings" for the year you are missing, ensuring that they issue it on company letterhead, and the tax office should treat that as proof of earnings.