Now GM does not allow you to accumulate money in your internal account.
Thus, when I have accumulated the minimally available winthdaft amount:

For example: eny 2 years contract will look like this:

1 monts mining, 2 mining, 3 mining, 4 mining, 5mining... 15 mining, 16mining, 17 (minimal winthdaft achieved)[auto-winthdaft] The remaining months are stolen by GM for the reason that without new contracts you will not reach a minimum.