What type of fixed-income fund would have the most tax-advantaged form of income distribution?

Canadian preferred share funds distribute income in the form of eligible Canadian dividends, which are tax-advantaged through the dividend tax credit.

In contrast:

U.S. preferred dividends are taxed as foreign income, fully taxable without credits.

Mortgage and bond funds generate interest income, which is fully taxable at the investor’s marginal rate.

Therefore, the most tax-advantaged distribution comes from a Canadian preferred share fund.