What documents are required for expert self-assessment tax return services?

When enlisting the services of an expert in self assessment tax return online, there are some basic consideration that any person or company must be willing to offer mainly pertaining to the tax returns. These includes copies of income (invoices, payslips, bank statements etc), details of expenses that can be claimed as deductions, previous tax return where necessary. From the side of the landlords the rental income and balance of the rental expenses is of great concern. You might also require investment statements or pension contributions information. That way the expert can file an accurate return and will be able to locate all the probable tax deductions easily, thus making the process much more efficient.