Turn yourself into a limited company and it is all a lot simpler. The tax system for sole-traders is quite archaic in this country and really not suitable for running a business. Most firms could make significant savings if they transferred their existing business into a Ltd company.
Ive done it ever since i went self employed i think there is an amount you can earn before you have to pay on account...it would be nice to know what it was
Marcus...
The limit is £500, as soon as your yearly tax bill exceeds this then you have to start paying on account. Most full-time window cleaners should be exceeding this anyway, otherwise they are just not earning enough to justify their work time (different if you are part-time).