7-15
• 360-day Date Mode Calculations
The following describes how calculations are processed when 360 is specified for the Date
Mode item in the Setup screen.
• If d1 and d2 are both the last day of February (day 28 in a normal year, day 29 in a leap
year), d2 is treated as day 30.
• If d1 is the last day of February, d1 is treated as day 30.
• If d2 is day 31 of a month and d1 is day 30 or day 31 of a month, d2 is treated as day 30.
• If d1 is day 31 of a month, d1 is treated as day 30.
9. Depreciation
Depreciation lets you calculate the amount that a business expense can be offset by income
(depreciated) over a given year.
• This calculator supports the following four types of depreciation calculations.
straight-line (
SL ), fixed-percent ( FP ), sum-of-the-years’-digits ( SYD ), or declining-balance
( DB ).
• Any one of the above methods can be used to calculate depreciation for a specified period.
A table and graph of the depreciated amount and undepreciated amount in year
j .
u Straight-Line Method (SL)
SL j : depreciation charge for the j th year
n : useful life
P V : original cost (basis)
F V : residual book value
j : year for calculation of depreciation
cost
Y −1 : number of months in the first year
of depreciation
u Fixed-Percent Method (FP)
FP
j : depreciation charge for the j th year
RDV j : remaining depreciable value at the
end of j th year
I % : depreciation ratio
{Y–1}(PV–FV )
SL
1 =
n 12
u
(PV–FV )
SL
j =
n
12–{Y–1}
({Y–1}≠12)
(PV–FV )
n 12
u
SLn+1 =
{Y–1}(PV–FV )
SL1 =
n 12
u
(PV–FV )
SL
j =
n
12–{Y–1}
({Y–1}≠12)
(PV–FV )
n 12
u
SLn+1 =
100
I%
FP
j = (RDVj–1 + FV ) ×
100
{Y–1}
I%
FP
1 = PV ×
12
×
FP
n+1 = RDVn ({Y–1}≠12)
RDV1 = PV – FV – FP1
RDVj = RDVj–1 – FPj
RDVn+1 = 0 ({Y–1}≠12)
100
I%
FP
j = (RDVj–1 + FV ) ×
100
{Y–1}
I%
FP
1 = PV ×
12
×
FP
n+1 = RDVn ({Y–1}≠12)
RDV1 = PV – FV – FP1
RDVj = RDVj–1 – FPj
RDVn+1 = 0 ({Y–1}≠12)
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