Pink paper (tax return) is signed precisely in order for a person to prove the right to claim income tax rebates and the employer to pay tax advances in the correct amount. But because the question also says that the employer does not tear, I do not know what to advise. I also don't know if that first job ends in March or if you will have two at the same time from March. Otherwise, if there were two simultaneous jobs and the first employer deducted tax advances and applied pink paper rebates (2070 basic discount and 335 student discount), then the second and any other CONCURRENT employers pay withholding tax, in this case 15% without discounts and you you have to make a tax return yourself at the end of the year. The stupid thing is that with such low incomes, the deposit and the total tax will be zero, so if the other employer conscientiously pays the 15% withholding tax for you, you will get it refunded only next year.