To separate out taxes you've collected or paid from your balance sheet and profit & loss statement....
First head to your tax settings
And edit Settings for Vat return
Make sure you two VAT accounts are setup correctly, for to deduct and one for tax type accounts
Next, go to your VAT Rates settings
Create two rates, one for purchases and one for sales taxation
Settings for your Purchase rate
Settings on your sales taxation rate
Be sure to add the Deduction components to each one and set it to the right accounts. For purchase rates set to your deduction account VAT input. For sales rates, make sure the deduction is set to the Sales VAT account for output.