Angela Rayner is facing calls to shun her government payoff after quitting over her tax affairs.
The Deputy PM dramatically resigned yesterday following a standards report that concluded she broke the ministerial code.
She is entitled to severance equivalent to three months of her pay - around £17,000.
However, from October 13 the rules are due to change so that ministers who commit 'serious' breaches can be blocked from receiving payoffs.
Tories have pointed out that Ms Rayner previously backed withholding such packages when ministers are found to have broken rules.
