Confusion about income for FLR(M)

[san333]

Hello everyone

I'm going to apply FLR M for my wife and daughter

I work as a contractor through agency and get paid weekly via umbrella company.

My payslip break down:
Original hours received from Agency - £1050
Taxable pay - £606.56
Non taxable pay after expenses - £351.26
Gross pay- £957.82
Net pay after tax and nic - £820.80

My confusion is, do I need to show the amount £1050 or £606.56 or £957.82.

Thanks