The government has, for a long time, incentivised certain savings behaviours by offering tax advantages. These advantages can apply to money you pay in, growth on your investments, money you take out, or a combination of all these. Investing in a platform changes nothing.
Your investments receive the correct tax treatment, leaving you without any surprises.
Although when you use a platform you have all your assets in one place rather than in separate products, you notionally identify what is pension investment, what is ISA investment, and what is unit trust investment. You may sometimes see this described as a tax wrapper, and it enables each part of your investments to receive the correct tax treatment. This means you still benefit from all the tax advantages to which you’re entitled; and where you do need to pay tax, you pay the correct amount.
Tax treatment varies according to individual circumstances and is subject to change.