24Trade and other receivables

	2018		2017
for the year ended 30 June	Rm		Rm
Trade receivables	23 742		20 982
Other receivables*	3 003		3 759
Related party receivables – equity accounted investments	102		92
Impairment of trade receivables	(199	)	(158	)

Trade and other receivables	26 648		24 675
Duties recoverable from customers	600		412
Prepaid expenses	829		1 133
Value added tax	1 652		1 421

	29 729		27 641

Other receivables include short-term portion of long-term receivables, receivables related to exploration activities and employee-related receivables.

Credit risk exposure in respect of trade receivables is analysed as follows:

	Carrying		Carrying
	value	Impairment	value	Impairment
	2018	2018	2017	2017
for the year ended 30 June	Rm	Rm	Rm	Rm
Age analysis of trade receivables
Not past due date	21 611	3	19 537	5
Past due 0 – 30 days	1 477	5	1 073	7
Past due 31 – 150 days	257	18	197	6
Past due 151 days – one year	93	44	22	10
More than one year**	304	129	153	130

	23 742	199	20 982	158

**More than one year relates to long outstanding balances for specific customers who have exceeded their contractual repayment terms.

Impairment of trade receivables

Trade receivables that are not past their due date are not considered to be impaired, except where they are part of individually impaired trade receivables. The individually impaired trade receivables mainly relate to certain customers who are trading in difficult economic circumstances.

No individual customer represents more than 10% of the group’s trade receivables.

Fair value of trade receivables

The carrying value approximates fair value because of the short period to maturity of these instruments.

Collateral

The group holds no collateral over the trade receivables which can be sold or pledged to a third party.

	2018	2017
	Rm	Rm
Business segmentation
 Mining	428	422
 Exploration and Production International	736	743
 Energy	11 487	8 323
 Base Chemicals	6 308	5 562
 Performance Chemicals	9 299	9 793
 Group Functions	1 471	2 798

Total operations	29 729	27 641

Accounting policies:

Trade and other receivables are recognised initially at fair value and subsequently stated at amortised cost using the effective interest rate method, less impairment losses.