• Communications of the Korean Mathematical Society
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• v.33 no.3
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• pp.823-831
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• 2018

We define progressive tax rate functions, study their properties, and describe some smooth models. The key requirement, defining the progressive nature of the taxation model, is that the progressive tax rate functions should have infinite contact with the zero function at the origin, in order to care the poor. In constructing a wide array of such functions, assisting functions are introduced.

• The Journal of the Korea Contents Association
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• v.7 no.8
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• pp.199-206
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• 2007

Capital gain comes from the transfer gain which is occurring by transferring assets except inventory assets. Our government recently has made capital gain tax on real estates and imposed as classified income tax by including it into aggregate income so that provide function of tax and curb property speculation. However the present income tax law imposes capital gain tax on capital profit including real estate and securities, while this law and the special tax treatment control law implement non-taxation and tax exemption too widely. That is to say, the system of capital gain tax can hinder the fair tax because it has various exemption terms including the non-taxation principle on a house for a family and the special tax treatment law. And also it has a problem in the sense of equity because it imposes tax by progressive tax rate on the subjects of capital gain tax considering them as the profit of that year, which were transferred, so there is difference between the income which has been made for a long time and the income made for a short time even in the same capital gain. Therefore this study identifies some issues surrounding the present capital gain tax system and focuses on presenting reasonable development plan.

• 사회경제평론
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• v.31 no.3
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• pp.55-92
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• 2018

Moon Jae-In government, which took power through the candlelight revolution, has put forward a "People First Economy". To realize this goal, the government promised to increase the growth rate of fiscal spending and the proportion of welfare spending compared to the conservative government in the past. This direction is desirable, but it does not meet the expectations of the progressive camp, which has hoped larger-scale welfare through active increased taxation. Above all, it would be hard to overcome the structural risks facing our economy through this policy. More bold fiscal policy is needed. For the time being, it is desirable to push for taxing on top-income households, corporations, and high-value assets, and to make sure that the tax levied on rental income is well established. If these tasks are well realized, it is necessary to move toward the next stage of welfare expansion and increased taxation.

• KIEAE Journal
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• v.15 no.6
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• pp.5-10
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• 2015

Purpose: To evaluate the economic performance of grid-connected photovoltaic system in residential house, household electricity bill policy of Korea Electric Power Corporation (KEPCO) must be applied precisely, and market tendency and uncertainty of system also need to be considered. In this study, to evaluate the economic feasibility of PV system, we measured PV power generation and electricity consumption of six of Green home in Daejeon through web based remote monitoring system. Method: We applied Monte-Carlo simulation based on life cycle cost analysis, to reflect an uncertainty of main factor in economic feasibility evaluation of photovoltaic system. Result: First, with deterministic analysis, the difference of NPV of cumulative financial savings among households varied from -3,310 ~ 24,170 thousand won, portraying notably big range. Also the possibility of getting the same result was 50% when applying uncertainty. Second, the higher electricity consumption is, the more economic feasibility of photovoltaic system increases because KEPCO uses progressive taxation in household electricity bill policy. Third, The contribution to variance of electricity price increases in NPV varied from 98.5% to 99.9%. While the inflation rate and annual degradation contributed very little to none.

• Journal of Cadastre & Land InformatiX
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• v.50 no.2
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• pp.133-153
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• 2020

Officially assessed land price has been the index of South Korea since 1989 throughout different sectors of tax and welfare. Officially assessed land price is used as a tax valuation for the tax on property holdings, and the equity of such is the most important factor in the fair taxation for the people of South Korea. On this wise, this research analyzed and verified the horizontal and vertical inequity of officially assessed land price in Seoul by using the real transaction data between 2016 and 2018. In fact, Seoul's assessment ratio for the entire three-year period was 60.64% and it showed to increase each year. Horizontal equity was found to be most favorable in 2017, and the horizontal equity of each borough of Seoul appeared to improve each year. Vertical inequity was found to have reverse inequality in most boroughs of Seoul, however, some parts of Gangnam districts such as Gangnam-gu, Seocho-gu, and Gangdong-gu presented progressive inequality. Such example showed the need for improvement in terms of balance by each borough. The use of quantile regression demonstrated reverse inequality in most quantile, but, the differences in the value of the coefficient by each quantile showed the need for improvement of officially assessed land price with the equity of each quantile. Through the equity verification of officially assessed land price, it was analyzed that the lack of equity was found by year, by borough, and by use district. In order to redeem the lack of equity, the government must systematically supplement the real-estate disclosure system by initiating ratio studies to verify horizontal and vertical equity.