camps/babysitting money

I personally don’t think you have to worry about halacha on this. Dina demalchusa dina would be that if the person gave you a 1099 on this income, then you would be obligated to report it for tax purposes, but since they didn’t, you don’t have to make it up for the IRS. If you did, then they will want to know from whom you got the income, and it could lead to that person getting in trouble for not paying social security, etc, for the wages they paid you. Better not start with unreported income. There is a minimum amount that they have to pay you in a calendar year before there’s any obligation for them to report it to the IRS, so you’re probably in the clear if you never got any tax forms.

I don’t think that unless it was registered as a business you need to worry. There would have to be paperwork processed and it’s obviously beyond the scope of a kid to do this. I don’t think you’re stealing from the government the taxes due on this income, but you could ask your LOR for a clear psak.

I am certainly not poskinning, but any income, once it reaches a certain level, has to be part of the tax equation. I know we hold to obeying the laws of the land in regards to business/employment. Whether there are halachic consequences, I dont know. I know no one wants to pay taxes on money they earn in a somewhat informal way, but I would ask an astute rabbi as many attitudes in our community vary regarding this topic.