Table:
|  | December 31, 2019 | December 31, 2018 |
| --- | --- | --- |
| Assets: |  |  |
| Operating lease liability | $878.5 | $— |
| Net operating loss carryforwards | 356.6 | 264.9 |
| Accrued asset retirement obligations | 174.9 | 165.7 |
| Stock-based compensation | 5.6 | 6.3 |
| Unearned revenue | 31.7 | 28.3 |
| Unrealized loss on foreign currency | 3.8 | 12.9 |
| Other accruals and allowances | 65.6 | 78.6 |
| Items not currently deductible and other | 26.1 | 26.2 |
| Liabilities: |  |  |
| Depreciation and amortization | (1,040.3) | (757.0) |
| Right-of-use asset | (865.1) | — |
| Deferred rent | (79.7) | (36.9) |
| Other | — | (15.3) |
| Subtotal | (442.3) | (226.3) |
| Valuation allowance | (194.2) | (151.9) |
| Net deferred tax liabilities | $(636.5) | $(378.2) |
Paragraphs:
AMERICAN TOWER CORPORATION AND SUBSIDIARIES NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Tabular amounts in millions, unless otherwise disclosed)
The components of the net deferred tax asset and liability and related valuation allowance were as follows:
The Company provides valuation allowances if, based on the available evidence, it is more likely than not that some or all of the deferred tax assets will not be realized. Management assesses the available evidence to estimate if sufficient future taxable income will be generated to use the existing deferred tax assets.
Question:
When does the company provide valuation allowances?
Answer: if, based on the available evidence, it is more likely than not that some or all of the deferred tax assets will not be realized.