nope…all gains or losses in a 401k are unrealized to the individual. It’s only income to you when you take it out. And even then it’s ordinary income and not investment income.

A 401k is like a separate person who doesn’t file tax returns, so it has neither taxable gains or losses. You, as taxable people never received the money, so you, as taxable people did not suffer the loss. The IRS is not going to let you duck taxes on the income while claiming the losses.

No. No capital gain or loss.

There is no tax or tax loss while the assets are in the 401(k) account.

The only way you could ever take a loss is if total distributions paid out of the account until it is zero balance, exceed the total contributions. So you cannot even think about 401(k) losses until the money is ALL gone. And that would be a sad day indeed.