Income is determined:
1° For bonds, participating securities, public bills and loans, by the interest or income distributed during the year;
2° For lots, by the amount of the lot itself;
3° For redemption premiums, by the difference between the sum redeemed and the issue rate of the loans. A decree (1) shall determine the issue rate to be used to calculate the tax on these premiums.
(1) Annex III, art. 41 octies to 41 duodecies.