Where an assessment is made on any person for the purpose of making good a loss of tax wholly or partly attributable to F2fraudulent or negligent conduct, the fact that the person’s F3liability to income tax or total income for any year of assessment is assessed as greater than it was previously taken to be shall not affect the validity of F4any income tax reduction or deduction from total income made in the case of that person’s spouse by virtue of section F5257BB, 257D or 265 of the principal Act; F6and the entitlement in that case of the first-mentioned person for the year in question to any income tax reduction or deduction from total income shall be treated as correspondingly reduced.