Deferred income

x 1 million

2021

2020

Book value at 1 January

809

725

Customer construction contributions received

112

105

Customer construction contributions paid

-1

-

Income recognised

-22

-21

Book value at 31 December

898

809

Classification

2021

2020

Current

22

22

Non-current

876

787

Total

898

809

The short-term deferred income is reported under 'contract liabilities' in 'Trade and other liabilities'.