
		2020
		Gross amount		Allowance for doubtful accounts			Present value discount			Book value
		In millions of won
Current assets
Trade receivables	￦		7,370,923		(208,184	)		—			7,162,739
Other receivables			799,598		(42,332	)		(1,535	)		755,731

			8,170,521		(250,516	)		(1,535	)		7,918,470

Non-current assets
Trade receivables			227,261		(806	)		—			226,455
Other receivables			1,728,486		(90,047	)		(3,325	)		1,635,114

			1,955,747		(90,853	)		(3,325	)		1,861,569

	￦		10,126,268		(341,369	)		(4,860	)		9,780,039


		2021
		Gross amount		Allowance for doubtful accounts			Present value discount			Book value
		In millions of won
Current assets
Trade receivables	￦		7,743,735		(203,838	)		—			7,539,897
Other receivables			602,113		(18,555	)		(1,040	)		582,518

			8,345,848		(222,393	)		(1,040	)		8,122,415

Non-current assets
Trade receivables			185,512		(1,501	)		—			184,011
Other receivables			1,792,895		(64,155	)		(5,890	)		1,722,850

			1,978,407		(65,656	)		(5,890	)		1,906,861

	￦		10,324,255		(288,049	)		(6,930	)		10,029,276

(2)	Other receivables as of December 31, 2020 and 2021 are as follows:


		2020
		Gross amount		Allowance for doubtful accounts			Present value discount			Book value
		In millions of won
Current assets
Non-trade receivables	￦		441,031		(37,062	)		—			403,969
Accrued income			38,956		—			—			38,956
Deposits			239,011		—			(1,535	)		237,476
Finance lease receivables(*1)			57,084		(365	)		—			56,719
Others			23,516		(4,905	)		—			18,611

			799,598		(42,332	)		(1,535	)		755,731

Non-current assets
Non-trade receivables			215,136		(80,451	)		—			134,685
Accrued income			834		—			—			834
Deposits			364,855		—			(3,325	)		361,530
Finance lease receivables(*2)			1,065,982		(625	)		—			1,065,357
Others			81,679		(8,971	)		—			72,708

			1,728,486		(90,047	)		(3,325	)		1,635,114

	￦		2,528,084		(132,379	)		(4,860	)		2,390,845

(1) Gross amount of finance lease receivables is the net lease investment by deducting unearned finance income of ￦105,127 million. (2) Gross amount of finance lease receivables is the net lease investment by deducting unearned finance income of ￦1,087,559 million.
		2021
		Gross amount		Allowance for doubtful accounts			Present value discount			Book value
		In millions of won
Current assets
Non-trade receivables	￦		232,172		(17,084	)		(9	)		215,079
Accrued income			57,300		—			—			57,300
Deposits			212,666		—			(1,031	)		211,635
Finance lease receivables(*1)			60,613		(178	)		—			60,435
Others			39,362		(1,293	)		—			38,069

			602,113		(18,555	)		(1,040	)		582,518

Non-current assets
Non-trade receivables			123,537		(56,407	)		(281	)		66,849
Accrued income			1,828		—			—			1,828
Deposits			441,393		—			(5,609	)		435,784
Finance lease receivables(*2)			1,140,080		(590	)		—			1,139,490
Others			86,057		(7,158	)		—			78,899

			1,792,895		(64,155	)		(5,890	)		1,722,850

	￦		2,395,008		(82,710	)		(6,930	)		2,305,368

(*1)

Gross amount of finance lease receivables is the net lease investment by deducting unearned finance income of ￦111,915 million.

(*2)

Gross amount of finance lease receivables is the net lease investment by deducting unearned finance income of ￦1,082,712 million.

(3)

Trade and other receivables are classified as financial assets at amortized cost and are measured using the effective interest rate method. No interest is accrued for trade receivables related to electricity for the duration between the billing date and the payment due dates. However once trade receivables are overdue, the Company imposes a monthly interest rate of 1.5% on the overdue trade receivables. The Company holds deposits of three months’ expected electricity usage for customers requesting temporary usage and customers with delinquent payments.

(4)	Aging analysis of trade receivables as of December 31, 2020 and 2021 are as follows:


		2020			2021
		In millions of won
Trade receivables: (not overdue)	￦		7,274,773			7,603,472

Trade receivables: (impairment reviewed)			323,411			325,775

Less than 60 days			3,505			11,577
60 ~ 90 days			28,729			27,201
90 ~ 120 days			10,687			28,230
120 days ~ 1 year			34,036			51,945
Over 1 year			246,454			206,822

			7,598,184			7,929,247
Less: allowance for doubtful accounts			(208,990	)		(205,339	)

	￦		7,389,194			7,723,908

At the end of each reporting period, the Company assesses whether the credit to trade receivables is impaired. The Company recognizes loss allowances for trade receivables individually when there is any objective evidence that trade receivables are impaired and significant and classifies the trade receivables that are not individually assessed as the trade receivables subject to be assessed on a collective basis. Also, the Company recognizes loss allowances based on an ‘expected credit loss’ (ECL) model.

(5)	Aging analysis of other receivables as of December 31, 2020 and 2021 are as follows:


		2020			2021
		In millions of won
Other receivables: (not overdue)	￦		2,363,967			2,251,474

Other receivables: (impairment reviewed)			164,117			143,534

Less than 60 days			46,399			87
60 ~ 90 days			31,183			4,881
90 ~ 120 days			1,873			1,248
120 days ~ 1 year			11,803			11,438
Over 1 year			72,859			125,880

			2,528,084			2,395,008
Less: allowance for doubtful accounts			(132,379	)		(82,710	)
Less: present value discount			(4,860	)		(6,930	)

	￦		2,390,845			2,305,368

At the end of each reporting period, the Company assesses whether the credit to other receivables is impaired. The Company recognizes loss allowances for other receivables individually when there is any objective evidence that other receivables are impaired and significant, and classifies the other receivables that are not individually assessed as the other receivables subject to be assessed on a collective basis. Also, the Company recognizes loss allowances based on an ‘expected credit loss’ (ECL) model.

(6)	Changes in the allowance for doubtful accounts for the years ended December 31, 2019, 2020 and 2021 are as follows:


		2019						2020						2021
		Trade receivables			Other receivables			Trade receivables			Other receivables			Trade receivables			Other receivables
		In millions of won
Beginning balance	￦		215,868			104,726			212,759			114,155			208,990			132,379
Bad debt expense			29,221			19,206			24,021			27,329			19,039			18,411
Write-off			(10,106	)		(1,146	)		(20,332	)		(1,910	)		(21,809	)		(58,762	)
Reversal			(41,940	)		—			(3,373	)		(2,464	)		(1,071	)		(79	)
Others			19,716			(8,631	)		(4,085	)		(4,731	)		190			(9,239	)

Ending balance	￦		212,759			114,155			208,990			132,379			205,339			82,710