The VAT Returns tab displays the settings that apply to the VAT return. On the return form itself you can only change the contact and the phone number.
The VAT return period indicates how often your company should submit its value added tax (VAT) returns. The frequency of your tax returns depends on a number of factors, including the size of your organization. Check with your tax authorities how often you need to file a tax return.
The EC sales list period indicates how often your company should submit an EC Sales List. The frequency of your tax returns depends on a number of factors, including the size of your organization. Check with your tax authorities how often you need to file a tax return.