The composition of trade receivables and reseller financing is as follows:
| 2017 | 2016 | |||
| Domestic customers | 4,057,752 | 3,315,783 | ||
| Reseller financing – Ipiranga (i) | 675,236 | 466,277 | ||
| Foreign customers | 229,701 | 180,679 | ||
| (-) Allowance for doubtful accounts | (295,580) | (233,332) | ||
| Total | 4,667,109 | 3,729,407 | ||
| Current | 4,337,118 | 3,502,322 | ||
| Non-current | 329,991 | 227,085 |
(i) Reseller financing is provided for renovation and upgrading of service stations, purchase of products, and development of the automotive fuels and lubricants distribution market.
The breakdown of trade receivables, gross of allowance for doubtful accounts, is as follows:
| Past due | |||||||||||||
| Total | Current | less than 30 days | 31-60 days | 61-90 days | 91-180 days | more than 180 days | |||||||
| 2017 | 4,962,689 | 4,102,549 | 200,939 | 46,491 | 48,197 | 87,812 | 476,701 | ||||||
| 2016 | 3,962,739 | 3,326,934 | 167,790 | 44,152 | 23,738 | 60,150 | 339,975 | ||||||
Movements in the allowance for doubtful accounts are as follows:
| Balance on 12/31/2014 | 178,444 | ||||
| Additions | 44,380 | ||||
| Write-offs | (22,008) | ||||
| Balance on 12/31/2015 | 200,816 | ||||
| Additions | 48,402 | ||||
| Write-offs | (15,886) | ||||
| Balance on 12/31/2016 | 233,332 | ||||
| Opening balance CBL S.A. (see Note 3.c) | 6,733 | ||||
| Additions | 66,427 | ||||
| Write-offs | (10,912) | ||||
| Balance on 12/31/2017 | 295,580 | ||||
For further information about allowance for doubtful accounts see Note 31 – Customer credit risk.