Tax Credits Predicted Earnings

[Exhaustedmumoftwo]

When I give my estimated income is this my gross pay? Or what I receive after tax and NI? Because when you give your earnings at the end of the year your total income is always what you've been paid isn't it?

The pay declared to tax credits at year end gross so I would assume this would be the same

The declared end of year figure includes charity deductions pensions and salary sacrifice.