CA state income tax return HSA contributions

[Laslo]

Both my employer and I made contributions to my HSA during 2017, automatically deducted pre tax from my paycheck. I understand that this amount (box 12 code W) is being added back to my income for the purpose of CA income tax (540 sched CA line 7 column C).

Today, I made a contribution to my HSA for the 2017 tax year, to further decrease my federal AGI.

How is this contribution handled on my CA income tax return? The instructions say to include on line 7 column C only those contributions that were made by my employer, shown on W-2 box 12 code W (including the pre tax deductions made by me). I suspect the contribution I made today should therefore be excluded and don't have to be added back to the federal AGI.

[Laslo]

I just figured it out myself. The "late" contribution ends up being a negative number on line 37 column B, which is then being added as a positive number on form 540 line 16 together with the amount from box 12 W...

[Critter]

OP answered own question.