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In page 401(k):

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2) Everyone always receives the same benefit as from a Roth account - the benefit from permanently tax-free profits on after-tax savings. The conceptual understanding[citation needed] is that the contribution's tax reduction is the government investing its money alongside the saver's, for him to invest as he likes. They become co-owners of the account. The government's share of the account (funding plus the tax-free profits earned by it) at withdrawal fully funds the account's withdrawal tax calculated at the contribution's tax rate. So the contribution's tax reduction is never a benefit, and profits are never taxed. The withdrawal tax is conceptually an allocation of principal between owners, not a 'tax', and there is no benefit 'from deferral'.