Can anyone help me work out how much tax rebate I’ll be having please?

[Freebet]

For 10 months I’ve been on the wrong tax code 1147 when I should have been on 1246.

does this mean I should have been able to earn another £990 without paying tax on that?

so I should get 20% of that back? Sorry I have no idea how this works

Yes but only 9/12 months so you need to take that into account

Thanks so would that be about £180?

I make it £156.75