The workmen compensation reserve of \rupee80,000 is used to cover the claim of \rupee1,00,000. The shortfall of \rupee20,000 is treated as a liability and is debited to the Revaluation Account at the time of admission of a partner.
Calculation:
\[
\text{Shortfall} = \rupee1,00,000 - \rupee80,000 = \rupee20,000.
\]