17. Income taxes:

(a) Numerical reconciliation of income tax expense:

At December 31, 2020, the Company has approximately $ 37,800,000 of U.S. non-capital loss carry-forward available to reduce future years’ taxable income of which $6,030,000 will expire between 2033 and 2040. The remainder will be carried forward indefinitely.

The Company’s provision for income taxes is reconciled as follows:


	December 31,		December 31,
	2020		2019
Accounting Net Loss before income tax - Greenbrook TMS	$	(29,663,540)	$	(15,909,879)
Accounting Net Loss before income tax - non-controlling interest	$	(739,181)	$	57,590

Accounting Net Loss before income tax	$	(30,402,721)	$	(15,852,289)

Income tax provision at statutory rate – 25.75% (December 31, 2019 – 25.95%)	$	(7,828,701)	$	(4,113,669)
Non-controlling interest		190,339		(14,945)
Non-deductible expenses and other permanent differences		(4,202)		119,258
Future rate differential		(20,880)		(81,857)
Change in unrecognized deferred tax assets		7,663,444		4,091,213

Income tax expense at effective rate	$	—	$	—

(b) Deferred tax asset/liability:

Deferred tax assets and liabilities recognized in the consolidated statements of financial position relate to the following:


	December 31,		December 31,
	2020		2019
Book value in excess of tax costs	$	(262,207)	$	(220,302)
Property, plant and equipment		262,207		220,302

Net deferred tax assets/(liabilities)	$	—	$	—

The following temporary differences have not been recognized in the Company’s consolidated financial statements:


	December 31,		December 31,
	2020		2019
Property, plant and equipment	$	—	$	—
Non-capital loss carry-forward		37,798,280		23,511,648
Other, including stock-based compensation		6,941,969		1,993,179
Intangible assets		10,356,383		263,732

Unrecognized total deferred tax assets	$	55,096,632	$	25,768,559