Work full time, been offered casual work. How much should I do.

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I work full time and earn around £31,000.
I have been offered session work for a company that pays £80 per session. This work has come from a hobby. I am available for one or two sessions a week in term time only.
My son pointed out that if I do to many there maybe a point t where it is not financially viable for me to do this.
He said he is in a position at work where he ( and others) can have as much overtime as they want but there is a tipping point where they no when it is not beneficial anymore.
How would I work out what what the point would be?
The casual work is for fun and something I enjoy.

You need to earn under 40K so you have £9K window

2x£80x39 is just over 6K

Higher rate is now £50 not £40!

He's wrong...unless you're claiming benefits.

Higher rate tax would be payable on earnings over the threshold but you would be nowhere near that on these figures.

You'd need to be taking £13k a year extra for higher rate tax to apply and even then you still benefit financially.

Remember even if higher rate kicks in it's only on earnings over the threshold and you would still be better off!

There is no situation outside if benefits where earning more makes you poorer lol

You will be taxed at the higher rate of 40% over £50,270.. but there’s never a point at which you will be taxed more than you earn so it’s still beneficial.

How long is each session?

I work p/t freelance and have a casual job one evening a week and every other weekend.

Different situation as even together they don’t total full time hours but I would consider how much of your down time you want to sacrifice as a regular commitment.

If it’s a couple of hours per session I’d think two sessions a week is manageable and if you’re otherwise ok financially, maybe have it paid into a separate account so it doesn’t impact your daily spending.

When I was full time employee I had a SAYE ‘slush fund’ which I used for treats and bigger ad hoc purchases.

Thank you for advice.
I don't receive any benefits.
The hours are 9.00am to 3.00pm and I don't have e to commit to a regular session. The organisers pool together people's availability and then distribute the work.
I had thought about putting the spare money into my pension fund.

There is no situation outside if benefits where earning more makes you poorer lol
We didn't think that but I can see now how I've worded it makes it look like. I was thinking about tax bands. My son mentioned it because he is paid an lot more than me and with his enhanced overtime rates would put him over £50,270 very quickly.