If the earnings are only 1,900 and there are no other tax credits available against this then assuming none of the employee types listed above apply, then the employee credit is granted to the value of the earnings. So for earnings of €1,900 a credit of €380 would be allowed. ( 1,900 x 20% ) This basically covers the tax due on those earnings. The employee credit is only available against that party's employment. i.e. any unused surplus cannot be transferred say to a husband or wife's employment.