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3. Tax Base and Deduction
  a.  Basic Rules for Calculating the Tax Base
(1)  Substance over form
The provisions governing the calculation of taxable income are applicable based on
the actual economic substance rather than upon merely formal distinctions.
(2)  Classified calculation
The tax base shall be separately calculated with respect to each class of income
earned by the taxpayer, namely, global income, retirement income, timber income,
and capital gains.
(3)  Global income tax base
The global income tax base is the amount remaining after deducting personal
exemptions from the aggregate of taxable global income, including such items
discussed above as interest income, dividends, rents from real estate, business
profits, wage and salary income, temporary property income, pension income, and
other income.
(4)  Non-inclusion in global income
The following items of income are not included in global income but are either
assessed separately or are non-taxable:
(a)  non-taxable income,
(b)  wages of daily workers, 
(c)  interest income subject to separate taxation that 
is eligible for withholding rates (See, 7. a. (1) (a) Interest income),
(d)  interest income and dividend income less than 40 million won,
(e)  income categorized as other income, up to 3 million 
won per year, and
(f) pension income up to 6 million won per year.
(5)  Schedular taxation
Retirement income, timber income, or capital gains are subject to schedular taxation
as independent income categories.
(6)  Taxable year to which gross income is attributable
Gross income is attributed to the taxable year in which it is settled.  The time for
attributing amounts of global income to global receipts is shown below.
(a)  Interest: the date payment is received
(b)  Dividends:
i)   Dividends on bearer shares: the date payment is received
ii)  Dividends made under the disposal of surplus: the 
date on which a resolution on appropriation of surplus is made by the
company concerned
iii) Deemed distribution: the date of decision of 
redemption of stocks, the date of decision on the decrease of capital or
transfer into capital, or the date of the registration of merger or of final
determination of the value of residual assets, or the date of receiving
consideration
iv) An amount appropriated as dividend by the 
Corporation Tax Law: the date on which accounts are settled
 (c)  Rent from real estate: the date stipulated in the 
contract or the date of payment if the contract does not exist 
 (d)  Business profits
i)  Sales of merchandise or products: the date of 
delivery or of the products reaching a deliverable state
ii) Consignment sales of merchandise or products: 
the date of sale by the consignee
iii) Sales of merchandise or products on a long-term 
installment or deferred payment basis: the date of delivery, subject to the
matching principle in case of expenses being incurred after the sale
iv) Performance of personal services: the date of completion of services
v) Sales or transfers of other assets: the date the 
consideration is received, or, if earlier, the date of registration or delivery
(e) Wage and salary income:
i)  Ordinary wage and salary income: the date of services provided
ii)  Bonuses given as a result of an appropriation of surplus: 
the date of the resolution by the Board of Directors to disposal of the surplus
iii) An amount regarded upon as bonus by the tax 
authorities under the Corporation Tax Law: the date of furnishing services in
the relevant business year of the corporation
(f) Retirement income: the date of termination of employment
(g) Temporary property income: the earlier of the date of 
final payment or the date of transfer of the property
(h) Capital gains: the date of receiving the consideration giving rise to the gain
(i) Timber income: to be determined in the same manner as used for business profits
(j) Other income: the date of receipt
(7) Taxable period:
(a) General rule: individual taxpayers use the calendar 
year as tax year; January 1 through December 31
(b) January 1 through the date of death, in case of a resident's death
(c) January 1 through the date of departure from the 
country, in case of a resident who becomes a non-resident
  b.  Calculation of Taxable Income
Taxable income is computed as the sum of the following items of income:
(1)  Interest: 
amount of income as determined above
(2)  Dividends
(a)  Dividend income actually distributed to the amount of income as determined above
(b)  Deemed distribution
i) The value of stocks or investments acquired by transferring surplus or
reserves into capital, except the following:
- transferring gains on retirement of treasury stock into capital more than 2
years after the retirement
- transferring asset revaluation reserve into capital (in case of a listed corporation)
ii) The amount in excess of the investment received 
by an investor through the liquidation of a corporation or through a reduction of capital
iii) The amount received by an investor upon the merger or consolidation of a
corporation more than his investment
iv) The value of stock dividends or additional investment interests acquired by an
investor as a result of another investor renouncing his preemptive right to acquire an
allocated portion of stock or investment interest following a capital increase of a corporation
(3)  Rents from real estate
(a) Taxable income: 
the total amount of income in each taxable period remaining after the deduction from gross
receipts of allowable expenses and losses carried-over within 5 years
(b) Gross receipts:
i)  Total revenue arising from the lease of real estate
ii)  If a resident who leases real estate or the title thereto receives a deposit, key deposit, or an
amount of a similar nature (an amount calculated as provided by the Presidential Decree
shall be counted in gross receipts)
(c) Necessary expenses:
Aggregate of expenses required to produce the total amount of income earned during the
taxable period
(4)  Business profits
The total amount of income in each taxable period remaining after deduction from gross profits 
of allowable expenses and losses carried-over from the previous 5 years
(5)  Wage and salary income
The total amount of income remaining after the deduction of the following amount:  used to
calculate the tax base for wage and salary income after the deduction described herein has
been made for that taxable period
(6) Pension Income
The total amount of income remaining after the deduction of the following amount with the deduction
ceiling of 6 million won
Pension income Deduction
Not more than 2.5 million Won Total amount
2.5 million Won ~ 5 million Won 2.5 million Won + 40% of pension exceeding 2.5 million Won
5 million Won ~ 9 million Won 3.5 million Won + 20% of pension exceeding 5 million Won
more than 9 million Won 4.3 million Won + 10% of pension exceeding 9 million Won
(7) Retirement income
The total amount of income remaining after deduction of the following amounts in each case:
Service year Deduction
Less than 5 years 300,000 Won per year
5 ~ 10 years 1,500,000 + 500,000 x (service year - 5)
10 ~ 20 years 4,000,000 + 800,000 x (service year - 10)
more than 20 years 12,000,000 + 1,020,000 x (service year - 20
(8) Capital gains
Income arising from the transfer of land, buildings, or rights thereon, stocks, and other assets 
specifically enumerated in the Income Tax Law shall be taxed separately from global income. This
separation was created to stabilize real estate prices and for tax purposes. 
Capital gains may be classified into the following categories:
(a) Income arising from a transfer of land, buildings.   
(b) Rights to real estate such as surface rights, leaseholds, or rights to acquire real estate; or
(c) Income arising from a transfer of stocks:
i) Gain on transfer = Selling price - Necessary expenses
ii) Amount of capital gains = 
Gain on transfer 
 - Special deduction for long-term possession of land and buildings
 - Capital gains deduction
"Necessary expenses" includes acquisition costs, costs of installations or improvements, and 
other capital expenditures. The special deduction for long-term possession of land or real
estate is as follows: 10% of the capital gain if the possession period is longer than three years
but does not exceed five years, 15% of the capital gains if the possession period exceeds five
years but does not exceed ten years, and 30% of the capital gain if the possession period is
over ten years. A capital gains deduction of 2.5 million won per year is given without regard to
the amount. However, the special deduction for long-term possession or capital gain deduction
is not allowed for unregistered real estate.
Capital gain Tax rate
Not more than 10 million Won 8%
10 million Won ~ 40 million Won 17%
40 million Won ~ 80 million Won 26%
more than 80 million Won 35%
¤· property held more than one year and less than 2 year : 40% 
¤· property held less than one year : 50% 
¤· house falling into the category where a household holds three 
houses under the Presidential Decree : 60 % 
< house designated  by the presidential decree>
¨ç house located within metropolitan and megalopolis areas 
¨è house transferred at 300 million won or more among houses located other than
metropolitan and megalopolis areas. 
* house with 18 pyong or less and house whose tax standard value is 40 million won or less
are excluded from 60% of heavy tax. 
¤·unregistered transferred property : 70% 
(9) Timber income
The aggregate amount of income remaining after subtracting forestation, acquisition, management,
and lumbering expenses from the gross receipts of each taxable period, a deduction of 6 million
won per year, and a deduction for losses carried over from the previous 5 years
(10) Other income
The aggregate amount of income of this category less necessary expenses; remuneration from an 
independent lecture allows a deduction of 80% thereof as necessary expenses
  c.  Calculation of Business Income
(1)  Taxable business income is the aggregate amount of 
income in each taxable period remaining after the deduction from gross receipts of necessary
expenses and losses carried-over from the previous 5 tax years.
(2)  Gross receipts
(a)  Gross receipts of a business are the aggregate of 
money or property receivable in connection with the activities of a business in the tax year.
i) If anything other than money is received, the income amount is calculated as the
monetary value thereof prevailing at the time of transaction.
ii) The value of returned goods and a discount on sales is offset in the calculation of gross
receipts for the year.
iii) Sales discounts in case of early settlement of an account receivables are deducted
from gross receipts
iv) Bounties and other similar sums received from sellers are included in gross receipt.
v) If tax amounts counted in necessary expenses are refunded, the amount of refund is
included in gross receipts.
vi) A decreased amount of liabilities due to exemption or the lapse of a liability is accounted
for as gross receipts; however, such an amount used for keeping carried- over deficits
in balance are not counted in gross receipts.
vii) Such other amounts of receipts related to the business as have been reverted or are to
be reverted to the businessperson in question are counted in gross receipts.
(b)  Non-inclusion in gross receipts: 
The following items are not covered in gross receipts:
i)  amount of income tax or inhabitant tax 
refunded or to be refunded, used for the payment of other tax amounts
ii)  value of assets received without compensation 
and amount of decrease in liabilities due to exemption or lapse of debts, used for
balancing carried-over deficits, 
iii) value of products used by businesses: self-produced raw materials or fuels, 
iv) amount of indirect taxes, such as the Value 
Added Tax, collected from customers to be turned over to the tax authorities, and
v) interest on the refund of overpayments of national taxes or local taxes.
(3)  Necessary expenses
(a) Necessary expenses are the aggregate of expenses 
incurred in relation to the accrual of gross receipts for each taxable period and include the
following:
i) purchase price of raw materials or goods corresponding to products or goods sold for
the year concerned/ Discounts on purchases and purchase discounts are deducted
from purchase price.
ii) book value of transferred assets at the time of the transaction (in the case of a real
estate sales business),
iii) salaries and wages,
iv) cost of repairing business assets, including management and maintenance expenses,
v) depreciation of fixed assets of the business,
vi) rent of business assets,
vii) interest on borrowings,
viii) bad debts (including VAT thereon),
ix) loss on revaluation of assets,
x) mine exploration expenses including development costs,
xi) advertisement expenses and sales promotion expenses,
xii) public contributions, designated donations and entertainment expenses within the
prescribed limit, and
xiii) deferred expenses such as start-up costs or experimental and research expenses
counted in necessary expenses.
(b) Tax free reserve
Contributions to the following reserves are considered necessary expenses, within the 
prescribed limits.
i) Reserves for retirement of up to 10% of total wages paid to employees who have served
for one year or more: the accumulated amount of the reserve is limited to 40% of the
estimated retirement allowances payable to all employees at the closing date of the year
ii) Reserves for bad debts up to an amount equal to 1% of aggregate sales on credit or
accounts receivable and VAT thereon, as of the closing date of the respective year: the
amount remaining after offsetting the actual bad debts is included in the gross receipts
in the following year
(c) The following amounts are treated as necessary expenses in the calculation of income for the year.
i) Gains on insurance claims of a resident used for acquisition of the same kinds of fixed 
assets as the lost or broken fixed assets, and those used for improvement of the
acquired fixed assets or the damaged fixed assets (must be within 2 years from the
beginning day or the year following the year in which the gains fall)
ii) Amount of subsidy actually used for acquisition or improvement of fixed assets
(d) Non-inclusion of necessary expenses
The following losses and expenses are not counted as necessary expenses in the
calculation of the income of a resident.
i) Income tax (including foreign income taxes), inhabitant tax, and tax paid or payable as a
result of delinquency in the payment of tax owed (including penalty taxes thereof)
ii) Fines, minor fines, penalty taxes, and expenses for disposition of taxes in arrears
iii) Public imposts, other than those which a taxpayer has an obligation to pay under the
law
iv) Losses from revaluation of assets other than inventory or short-term investment assets                                   
v) Expenses deemed by the government not to have any direct connection to the business
vi) Unpaid amounts of liquor tax or other excise taxes on inspected or carried out products
not yet sold
vii) Interest on borrowing incurred by a resident and used to fund construction, and interest
on private loans of which the sources are unknown
viii) Depreciation amount of the fixed assets allocated for each year, exceeding the amount 
allowed as necessary expenses
ix) Household expenses and prepaid expenses
x) Value added tax paid on inputs
(e) Non-inclusion in necessary expenses of designated donation
If a taxpayer makes donations other than that designated below, or makes donations in
excess of 10% of the taxable income (excluding public contributions and carried-over loss),
the amount is not treated as a necessary expense (the amount in excess of such a limit 
may be carried over for 3 years).
i) Donations to public interest entities, social welfare organizations, and religious 
organizations
ii) Donations and scholarships for academic research, technical development, and athletic
skill development
iii) Other donations to public entities prescribed by the Presidential Decree
The following contributions are always treated as necessary expenses in computing
taxable income (but may not be carried over).
i) Value of money and goods donated to government agencies and local governmental
bodies without compensation
ii) Contributions for national defense and war relief
iii) Value of money and goods donated for the relief of victims of calamities
(f) Non-inclusion in necessary expenses of entertainment expenses
i)  If a taxpayer's entertainment expenses exceed the aggregate sum of the following amounts,
the amount in excess thereof is not to be counted as a necessary expense. (Note:
Entertainment expenses are allowed only when supported by recognizable regular invoices
such as credit card invoices if the one-time expenditure is over 50,000 won.)
- an amount calculated by multiplying 12 million won (18 million won in the case of a small or
medium size enterprise) by the number of months in the respective tax period, divided by 12
- an amount calculated by multiplying the total amount of revenue for the business year by
the rates listed in the table below
Revenue amount Rate
10 billion Won or less 0.2%
over 10 billion Won but not more than 50 billion Won 20 million Won + 0.1% in excess of 10 billion Won
more than 50 billion Won 60 million Won + 0.03% in excess of 50 billion Won
(g) In the case of transactions between related persons which result in an unreasonable
reduction of the tax burden, the government may adjust the income amount for each year of
said taxpayer, regardless of activities or calculation of the taxpayer.
(4)  Depreciation
Depreciation cost is calculated as necessary expenses in computing income, and is
  determined in accordance with the useful life of fixed assets.
(a) Methods of calculating depreciation
Depreciation of fixed assets is calculated according to the following methods.
i)  Fixed percentage method or straight-line method for tangible fixed assets (only the
straight-line method may be used for buildings, but either method may be chosen for
machinery and equipment )
ii)  Straight-line method used for intangible fixed assets 
iii)  Unit of production method or straight line method for mining rights: Under the unit of 
production method, the actual output extracted in a tax year is compared to the estimated
total amount to have been extracted, and the ratio is applied to the book value of the mineral
rights to determine the size of the depreciation deduction allowed. 
iv) Unit of production method, fixed percentage method, or straight line method for tangible 
fixed assets used in mining
(b) Acquisition value of fixed assets
i) In case of fixed assets purchased, it is the price quoted at the time
of purchase (including registration tax, acquisition tax, and other incidental costs, but 
not Value Added Tax).
ii)  In case of fixed assets acquired by means of one's own construction, fabrication, etc., it
is the aggregate costs of raw materials, labor, freight, loading and unloading cost,
insurance premiums, fees, public imposts (including registration tax and acquisition tax), 
installation expenses, and other incidental costs.
iii)  In the case of fixed assets other than those referred to in i) and ii), it is the normal price 
quoted at the time of acquisition.
(c) Useful life and depreciation rate
Refer to the chapter covering the corporation tax law.
(d) Residual value
The residual value of a fixed asset is zero, but becomes 5% of the acquisition value in case
of depreciation when using the fixed percentage method. This amount is claimed as an
expense in the final year of depreciation.
(e) Revenue expenditures and capital expenditures
i) Repairing expenses disbursed by a taxpayer either to restore his assets to their original
state or to maintain their efficiency are regarded as revenue expenditures.
ii) Repairing expenditures spent either to extend the useful life or to increase the actual
value of fixed assets are regarded as capital expenditures.
(5)  Accounting for inventory
(a) A taxpayer may select one of the following methods of inventory accounting. The accounting
method utilized for filing the tax return shall be reported by the due date for the year in which the
business is begun.
i) Cost method
ii) Lower of the cost or the market method
(b) If the cost method is applied, one of the following conventions must be used.
i) Specific identification method
ii) First-in, first-out ("FIFO") method
iii) Last-in, first-out ("LIFO") method
iv) Weighted average cost method
v) Moving average cost method
vi) Cost of sales rebate method
(c) Different accounting methods may be applied to the various assets by category and place of
business, in accordance with the following classes of assets.
i) Products and merchandise
ii) Semi-finished goods and work in process
iii) Raw materials
iv) Goods in stock
(d) In any of the following cases, the head of a tax office may value inventory assets according
to the FIFO method (weighted average cost method in case of securities, specific identification
method in case of real estate held for sale).
i) A taxpayer fails to report his method of accounting for inventory within the time required.
ii) A taxpayer accounts for inventory using a method other than that reported.
iii) A taxpayer changes the accounting method used for inventory without filing a report of 
such change. 
  d. Exemptions and Deductions Related to Global Income
There are four (4) exemptions or deductions related to global income.
(1)  Basic Exemption
Residents with global income are entitled to annually deduct an amount equivalent to 1 million
won multiplied by the number of persons in the taxpayer's family, as determined below.
(a) A resident taxpayer
(b) A spouse with annual income of less than 1 million won 
(c) Dependents with annual income of less than 1 million won living in the same household with
the taxpayer
* A dependent is a lineal ascendant aged sixty or older (fifty-five for females), a lineal
descendent of the resident aged twenty or less (there is no age restriction for a
handicapped person), a sibling aged under twenty or over sixty, and all other members of
the household supported by the resident.
(2)  Additional Exemption
A resident eligible for a Basic Exemption and who belongs to any of the following classes may
also deduct 1 million won (a: 1.5 mil. won per year for those 70 years of age or older, b: 2 million
won, c: 500,000 won) per year from his/her global income:
(a) a person who is 65 years or older,
(b) the handicapped, as prescribed by the Presidential decree or                   
(c) a female head of family with dependents or with a spouse 
(d)  anyone with a lineal descendant not more than 6 years of age.
(3)  Additional Exemption for smaller Basic Exemption
A resident with wage and salary income, if the number of persons eligible for basic exemption
is one or two, may deduct 1 million won or 0.5 million won respectively.
(4)  Special Deduction
Wage and salary income earners may deduct an amount equal to the sum of the following from
their wage and salary income, during the taxable year.
(a) Insurance premiums paid, up to 1,000,000 won: This limit does not apply to amounts paid for 
medical care insurance.
(b) Insurance premiums of insurance exclusively offered for handicapped persons, up to one
million won
(c) Medical expenses incurred exceeding 3% of wage and salary income, up to 5 million won:
The deduction ceiling does not apply to expenses paid for the rehabilitation of handicapped
dependents, senior citizens and residents. 
(d) Domestically incurred educational expenses of an employed taxpayer including graduate
students and educational expenses by a taxpayer on behalf of his descendants pursuant to
(1). The deduction for education expenses of descendants is limited to the following amounts: 2
million won annually per student for kindergarten and nursery school expenses, 2 million won
annually per student for elementary-, junior-and high school expenses, and 7 million won
annually per student for college education expenses. Educational expenses incurred overseas
by lineal descendants are eligible for deduction, subject to the following limits (annually, per
student): 2 million won for kindergarten, 2 million won for elementary, junior, and high schools,
and 7 million won for college. Education expenses for the taxpayer himself maybe deducted
without a ceiling. 
(e)  Special education cost for the disabled: No ceiling
(f)  40% of deposits of an account earmarked for purchasing a house, which is held by a
person who does not own a house during the year concerned or a person who owns only
one house that is smaller than prespecified size in the presidential decree. 
(g) Forty percent of the loan interest (for a total of up to three million won per year)
allotted to the lease of a house of appropriate size paid by a person without
housing or owning only one house which is no more than 85 square meters, who
is subscribed to a qualifying savings program for home ownership
(h) Interest up to 10 million won per year of a mortgage loan with the duration of more than 15 
years
(i) Deduction for donations; amounts donated to qualified institutions, up to 10% of the 
taxpayer's salary and wage income for the year: This limit of deduction does not apply to the 
donations to specific welfare facilities.
(5)  Standard Deduction
Alternatively, a taxpayer may elect to choose an annual standard deduction of 600,000 won (one
million won for wage and salary earners), if he or she fails to claim deductions in question or
accrues only global income without any wages or salaries earned.
  e. Scope of Persons Eligible for Personal Exemptions and Determination of Eligibility
Persons eligible for spousal exemption, dependent exemption, or  exemption for handicapped or
aged persons must be (i) a spouse and/or unmarried lineal descendant and (ii) family members
who are listed on the registration card of the resident actually living at the domicile or residence. A 
person who has temporarily left the taxpayer's domicile or residence for reasons of schooling,
medical treatment, business, or work may still be entitled to an exemption. The determination of
eligibility shall be made based on the existing conditions at the closing date of the tax period 
concerned.