Tax credits... is there a maximum amount for a bonus you can get before it effects tax credits? Or does anything above your normal salary effect it?

[juicychops]

il be getting a bonus next month... only £120 as im on a low wage, but am i going to just get this taken back off me again throughout the next tax year?

Can't find the answer but maybe check here?

Yes, bonuses etc that are included in your final earnings for the tax year are taken into account by tax credits when you state your gross pay at renewal.