this message is primarliy to answer hatwomans Qs....sorry for hijack.
Sorry I wasn't on yesterday.
Right.
Allowable expenses... there is a list on hmrc ewbsite - but that is down so I shall try and remember to post like tomororw.
Basically you do a sum which is
Income - Allowable expenses = Profit
You pay tax on your profit.
BUT you have to break it down for your tax return. If you Net turnover (i.e. income) is greater than £15K you have to break down your expenses into categories (for eg. stationary, vehicle costs, raw materials salary - including your own; there is also a full list on hmrc). If your turnover is less that £15K you basically give 2 total figures - income and expenses which is much easier.
WRT to things that are used for work and for business you have to calculate what proportion is business use - and claim the appropriate value. For example we claim 50% of PC related items. DP writes down his business mileage and personal mileage each week. It usually works out that 95~% of his milelage is business so he claims 95% of all car expenses: fuel, tyres, maintenance, car wash, air freshener.....
Incidentally in most industries you claim a mileage allowance - which is fixed rate, published by hmrc each year. In which case you have to keep a log of business milage seperate from personal mileage. However, because DP is a driving instructor his car is his job so he can claim everything as itemised bills and recoup the 'actual' cost of running the car.
You may find it helpful to download the Tax return form (SE pages) and notes so you can see what will be expected of you and you can set up your accounts accordingly. You may find it helpful to have 1 spreadsheet per "expenses category".
Also if you are working from home you can claim a small amount towards utility bills. I think Tax man told DP £2/week about 6yrs ago He is npw claiming £3/week I think. I guess it depends how much work you are doing form home.
WRT to business account - it really doesn't matter. At the end of the day you don't need to keep records of petty cash as such if you are a sole trader. You just 'submit' all your relevant receipts. You pay tax on all of your profits so it doesn't matter if that is in a business account or a personal account.
DP used to keep all his earnings seperate and bank it seperate from personal cheques etc. (but into same persoanl account) - but we just found it a faff TBH.
I will post the relevant hmrc links over the weekend when website is back up
ANy more Qs, just shout.