Tax Drag

Regarding tax drags,

Is the tax drag unaffected by investment return and time horizon for deferred capital gain but is affected by both in the case of accrual taxes?

I also don’t get this statement:“Whereas the tax drag on after-tax accumulations subject to annual accrual taxes compounds over time, the tax drag from deferred capital gains is a fixed percentage regardless of the investment return or time horizon.”

taxes on deferred capital gains are due only in the end of the investment period. Do the calculations yourself and see the effects.