This is a little complicated. There is a California Capital Loss Carryover Worksheet which you may or may not have in your 2017 return. If you do not have it, you can easily complete it if you have your California Schedule D and your California 540. Line 8 is what you are seeking.
California Capital Loss Carryover Worksheet
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Loss from Schedule D (540), line 11, stated as a
positive number. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 _________
Amount from Form 540, line 17 . . . . . . . . . . . . . . . . . 2 _________
Amount from Form 540, line 18 . . . . . . . . . . . . . . . . . 3 _________
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Subtract line 3 from line 2. If less than zero, enter
as a negative amount. . . . . . . . . . . . . . . . . . . . . . . . . . 4 _________
Combine line 1 and line 4. If less than zero,
enter -0-. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 _________
Loss from Schedule D (540), line 8. . . . . . . . . . . . . . . 6 _________
Enter the smaller of line 1 or line 5 . . . . . . . . . . . . . . . 7 _________
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Subtract line 7 from line 6. This is your capital loss
carryover to 2018 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 _______
