関連ワード:  w2 12d code w    w2 12 code w    w2 box 12 code w    w2 box 12 code w meaning    w2 line 12 code w    w2 box 12 code w employer contribution    w2 box 12 code w employee contribution    w2 12 b code w    w2 section 12 code w    w2 box 12 code w taxable