דינא דמלכותא במדינת ישראל

Daf Hashavua

Bava Kama 113a

 והאמר שמואל דינא דמלכותא דינא    

There is a Machlokes Rishonim if Dina D'malchusa is 

applicable in a Jewish Malchus.

According to the רמב"ם & רשב"ם D.D. is applicable

even in Eretz Yisroel with a Jewish Government.

According to the ר"ן the land belongs to the Shevatim

and all of Bnei Yisroel, therefore the Malchus has no power 

of Dina D'malchusa.

b) Laws that the populace  accepted amongst themselves 

and are willing to pay taxes because it benefits the inhabitants 

even the ר"ן will agree D.D. applies in a Jewish Malchus."

Today with the State of Israel whose government is non-Frum,

according to,

a) Harav E. Henkin & Harav Ovadya Yosef zt"l, all the laws 

(not opposing Torah) must be followed because of D.D.

b) Harav Y.S. Elyashiv zt"l, held it is a Safek*

c) The Chazon Ish  holds  there is no D.D. in 

Medinas Yisroel.

Most Poskim would probably agree,

1) D.D. is applicable on traffic laws and building codes etc.

2) Those who benefit from the social programs may not

cheat on their taxes.

*The אבני מילואים אבהע"ז כ"ח & חת"ס יו"ד ב' שי"ד

both argue on the בית שמואל כ"ח:ג  and hold

D.D. is דאורייתא , therefore might be a

ספק דאורייתא