18 Trade accounts receivable

Aging structure of trade accounts receivable

	2021
millions of CHF	Expected loss rate	Gross amount	Allowance	Net book value
Not past due	0.1%	19.4	–0.0	19.4

Past due
1–30 days	0.1%	6.9	–0.0	6.9
31–60 days	2.7%	1.5	–0.0	1.5
61–120 days	19.5%	0.8	–0.2	0.7
>120 days	99.8%	1.1	–1.1	0.0
Total trade accounts receivable as of December 31		29.8	–1.3	28.5

	2020
millions of CHF	Expected loss rate	Gross amount	Allowance	Net book value
Not past due	0.3%	19.3	–0.1	19.3

Past due
1–30 days	0.5%	5.8	–0.0	5.8
31–60 days	8.2%	0.5	–0.0	0.5
61–120 days	7.6%	0.4	–0.0	0.4
>120 days	92.6%	1.3	–1.2	0.1
Total trade accounts receivable as of December 31		27.4	–1.3	26.1

Allowance for doubtful trade accounts receivable

millions of CHF	2021	2020
Balance as of January 1	1.3	1.5
Additions	0.1	0.4
Released as no longer required	0.0	–0.6
Utilized	–0.1	–0.0
Currency translation differences	0.0	–0.0
Balance as of December 31	1.3	1.3

Approximately 35% (2020: 29%) of the gross amount of trade accounts receivable was past due and an allowance of CHF 1.3 million (2020: CHF 1.3 million) was recorded. The recoverability of trade accounts receivable is regularly reviewed, and the credit quality of new customers is thoroughly assessed. Due to the large and heterogeneous customer base, the credit risk from individual customers of the group is limited. The allowance for doubtful trade accounts receivable is based on expected credit losses. These are based on historical observed default rates over the expected life of the trade receivables and are adjusted for forward-looking information such as development of gross domestic product (GDP).

Accounts receivable by geographical region

millions of CHF	2021	2020
Europe, the Middle East and Africa	17.9	15.4
– thereof Germany	11.4	10.2
– thereof Switzerland	4.9	4.0

Americas	7.2	7.9

Asia-Pacific	3.4	2.7

Total as of December 31	28.5	26.1