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I came across this useful fact sheet on the £1000 "hobby" trading allowance.
It seems to explain everything that you asked.
https://www.litrg.org.uk/sites/default/files/files/LITRG-Factsheet-trading-allowance-2020.pdf
If you go over the £1000 income trading allowance, you can deduct the £1000 trading allowance from your total trading income rather than claim expenses.
Useful if you do not have lots of expenses.
I presume that you have been using "Cash Basis" accounting for your self assessment?
If you were using traditional accounting, stock at year end would not reduce your taxable income/profit.
You could elect to use the "Cash Basis" for accounting, in which case you could claim the full value of all the stock you bought in that financial year.
https://www.gov.uk/simpler-income-tax-cash-basis
What do you mean by "was just throwing everything back in"?
Do you mean you were buying stock with the money from your sales?
If so, and if you had stock on hand as of financial year end, then you need to deduct the value of your remaining stock from your expenses.
This would make your profit...
You cannot include holiday pay in the hourly rate (rolled up pay).
From the .gov site:
Rolled-up holiday pay
Holiday pay should be paid for the time when annual leave is taken. An employer cannot include an amount for holiday pay in the hourly rate (known as ‘rolled-up holiday pay’).
Having analysed the currency/value/volume of my PayPal transactions from the past year and calculated the old and new fee structures, the overall difference in my fees will be negligible.