As a response policy to COVID-19, the Korean government has extended the loss carryforward period and the loss carryback period. This study explores a desirable reform plan for the loss offset provisions in an economic crisis, and to estimate the effect of this tax reform. In most OECD countries, loss carryback is normally allowed very limitedly, but during economic downturns, it is actively used to solve the problem of liquidity shortages of companies. Although it is not necessary to permanently extend the loss carryback period of SMEs, the expansion of loss carryback period should be given priority over that of loss carryforward period during economic downturn. In addition, SMEs that would have been subject to loss carryback are smaller and have a higher debt ratio than SMEs that did not. It suggests that the extension of the loss carryback period for SMEs can significantly help in resolving the liquidity problem of small businesses, which are having difficulty in raising funds due to the sluggish economy. Finally, we estimate the financial effect of extending the loss carryback period from one year to three years. It is expected that corporate tax will be reduced by KRW 114.1 billion and income tax by KRW 4.1 billion in 2022. However, since the loss carryforward will be reduced by the same amount as the loss carryback, from a long-term perspective, the effect of the extension of the loss carryback period on the net finance is expected to be much smaller than this.
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