If you do not already have one, you should set up an online HMRC account for your company so that you can see all your tax information in one place.
If you set up your company online then you should already have an online HMRC account set up, and can access it using the User ID and password that you chose at the time. If you do not have one set up you can do so here.
Once you have the account set up, you can add each tax that you want to view as part of your online account. Most companies will have corporation tax, PAYE and perhaps VAT to view so you will want to add these. The video below explains how to add the individual taxes: