What's the catch?
You can register and use the services provided on this website free of charge.
You can use as many or as few of the facilities as you wish.
If you are familiar with bookkeeping/accounting packages then you can use this website to prepare VAT returns and financial statements including profit and loss accounts and balance sheets.
Or you may simply wish, for example, to use the website (24/7 and from anywhere in the world) to prepare and maintain a record of your sales invoices rather than using a spreadsheet.
The catch? The catch is that you have to be prepared to do a little bit of work yourself by reading the guidance notes provided.
However, if you would prefer to do less work yourself then there are a number of fee paying options set out here.