Table

Tax bases, assessed taxes and tax deductions for companies. NOK million
	2017	2018
¹Includes other deductions on the Norwegian continental shelf, such as payments related to cessation of activity on the continental shelf.
Taxable income	467 898	549 774
Net wealth	225 040	234 494
Income tax	112 907	127 636
Wealth tax	338	352
Special tax	61 494	98 357
Tonnage tax	55	60
Tax on ground rent income	6 332	10 727
Tax on natural resources	1 642	1 676
Tax deduction for tax on natural resources	1 585	1 786
Deduction for received dividends	..	..
Tax deduction for tax paid to foreign country	937	1 017
Tax deduction for expenses on research and development	3 990	4 029
Paid back tax	..	..
Paid exploration expenses¹	17 151	3 844