(in millions of euros) | December 31, 2017 | December 31, 2016 |
Lump sum payments | 228 | 249 |
Adjustment mechanism for the main rail network concession | 121 | 119 |
Deferred credits | 349 | 368 |
Less: current | -40 | -40 |
Total non-current as at 31 December | 309 | 328 |
The lump-sum payment for wage increases resulting from making SPF independent in 1994 is expected to be released up to 2035, and be credited to the income statement. The franchise fee adjustment mechanism is included in the implementation agreement for the main rail network franchise (see note 31); the amounts will be released in equal instalments and be credited to the income statement during the term of the franchise up to 2024.
Accounting policies
This income concerns amounts received in one go under agreements with terms extending to future years. The proceeds are credited to the income statement over the term of the agreements to which they relate. The proceeds are measured at amortised cost.