miscalculated my net income for tax credits annual declaration

[Eli96]

I rushed my child and working tax credit form in July and should have said it was an estimate but didnt. I am now doing my self assessment tax return online and have calculated that my net earnings are £867 less ie I have found some mislaid receipts for expenses. What should I do as my tax credits and tax return don't tally?

just ring up and explain, this happened to us last year and they where very understanding and sorted it over the phone in no time

Tax credits are based on gross earnings normally. Agree with giving HMRC a call. It's not a big discrepancy

Tax credits are based on the income you pay tax on. So gross earnings for tax purposes, which if you are self employed will be after (or net of) allowable expenses.