The official minimum rates of pay rose for 2.7 million workers on 1 April.
The rate for workers aged 21 and over is called the National Living Wage, while those aged 18 to 20 are paid the National Minimum Wage.
A rise is expected in the Budget on Wednesday, with 18-20 year-olds seeing the same rise as over-20s.
The Times reported that the National Minimum Wage for 18-to-20 year-olds is likely to rise by 3.9% from £10.85 an hour to around £11.27.
The rate for over-20s will also increase by 3.9%, to £13.20.