Income Taxes	6 Months Ended
Jun. 30, 2020
Income Tax Disclosure [Abstract]
Income taxes	9. Income taxes Since inception in 2014, the Company has generated cumulative federal and state net operating loss and research and development credit carryforwards for which no net tax benefit has been recorded due to uncertainty around utilizing these tax attributes within the respective carryforward periods. The income tax expense for the three and six months ended June 30, 2020 represents taxes on interest income earned by the Company’s subsidiary, Frequency Therapeutics Securities Corporation, a Massachusetts Securities Corporation. As of December 31, 2019, the Company had federal net operating loss carryforwards of approximately $50,199 and Massachusetts state operating loss carryforwards of approximately $41,242 which may be available to offset future taxable income. The U.S. federal net operating loss carryforwards include $22,400 available to reduce future taxable income through 2037 and approximately $27,779 which do not expire and are available to reduce future taxable income indefinitely. The state net operating loss carryforwards are available to offset future taxable income through 2039. As of December 31, 2019, the Company also had federal and Massachusetts research and development tax credit carryforwards of $701 and $533, respectively, which are available to offset federal and state tax liabilities through 2039 and 2034, respectively. Realization of future tax benefits is dependent on many factors, including the Company’s ability to generate taxable income within the net operating loss carryforward period. Net operating loss and tax credit carryforwards may become subject to an annual limitation in the event of certain cumulative changes in the ownership interest of significant shareholders over a three-year period in excess of 50%, as provided under Sections 382 and 383 of the Internal Revenue Code of 1986, as amended, respectively, as well as similar state provisions. These ownership changes may limit the number of carryforwards that can be utilized annually to offset future taxable income. In general, an ownership change, as defined by Section 382, results from transactions increasing the ownership of certain shareholders or public groups in the stock of a corporation by more than 50% over a three-year period. The Company has completed several financings and has conducted a study to assess whether a change of control has occurred or whether there have been multiple changes of control since inception and has determined that an ownership change did occur in March 2017. Accordingly, utilization of $12,400 of the U.S. net operating loss carryforwards which were incurred prior to March 2017 (pre-ownership change) is limited under Section 382. After the Section 382 limitations, the Company may utilize approximately $10,800 of its pre-ownership change net operating loss carryforwards based upon an annual usage of approximately $1,600 for each of the next five years after the ownership change and approximately $180 for each of the 15 years thereafter. The remaining pre-ownership change net operating losses of approximately $1,600 were written off due to expiration under limitation. The limitation has been determined by first multiplying the value of our stock at the time of the ownership change by the applicable long-term tax-exempt rate. These carryforwards may be subject to further annual limitations under Section 382 in the event of future changes in ownership. Additionally, the Company has determined an ownership changed occurred in October of 2019 as a result of the IPO. Accordingly, utilization of approximately $46,123 of the U.S. net operating loss carryforwards incurred prior to October 2019 is also limited under Section 382. The Company has determined it will be able to utilize the entire $46,123 of its pre-ownership change net operating loss carryforwards based upon the limitations calculated from the October 2019 ownership change. These carryforwards may be subject to further annual limitations under Section 382 in the event of future changes in ownership. ASC 740 requires a valuation allowance to reduce the deferred tax assets reported if, based on the weight of the evidence, it is more likely than not that some portion or all of the deferred tax assets will not be realized. After consideration of all the evidence, both positive and negative, the Company has recorded a valuation allowance against its deferred tax assets at December 31, 2019 and 2018 because the Company’s management has determined that it is more likely than not that the Company will not recognize the benefits of its federal and state deferred tax assets primarily due to its cumulative loss position and, as a result, a valuation allowance of approximately $16,204 and $12,229 as of December 31, 2019 and 2018 has been established. The Company has no unrecognized tax benefits. The Company has not, as yet, conducted a study of its research and development credit carryforwards. Such a study may result in an adjustment to the Company’s research and development credit carryforwards; however, until a study is completed, and any adjustment is known, no amounts are being presented as an uncertain tax position. A full valuation allowance has been provided against the Company’s research and development credits and, if an adjustment were required, this adjustment would be offset by an adjustment to the valuation allowance. Thus, there would be no impact to the consolidated balance sheet or consolidated statements of operations if an adjustment were required. The Company has elected to recognize interest and penalties related to income tax matters as a component of income tax expense, of which no interest or penalties were recorded for the years ended December 31, 2019 and 2018. The Company files income tax returns in the U.S. and Massachusetts. The statute of limitations for assessment by the Internal Revenue Service and Massachusetts tax authorities remains open for all years since 2014. To the extent the Company has tax attribute carryforwards, the tax years in which the attribute was generated may still be adjusted upon examination by the Internal Revenue Service or state authorities to the extent utilized in a future period. No federal or state tax audits are currently in process.

Income Taxes

6 Months Ended

Jun. 30, 2020

9. Income taxes

Since inception in 2014, the Company has generated cumulative federal and state net operating loss and research and development credit carryforwards for which no net tax benefit has been recorded due to uncertainty around utilizing these tax attributes within the respective carryforward periods.

The income tax expense for the three and six months ended June 30, 2020 represents taxes on interest income earned by the Company’s subsidiary, Frequency Therapeutics Securities Corporation, a Massachusetts Securities Corporation.

As of December 31, 2019, the Company had federal net operating loss carryforwards of approximately $50,199 and Massachusetts state operating loss carryforwards of approximately $41,242 which may be available to offset future taxable income. The U.S. federal net operating loss carryforwards include $22,400 available to reduce future taxable income through 2037 and approximately $27,779 which do not expire and are available to reduce future taxable income indefinitely. The state net operating loss carryforwards are available to offset future taxable income through 2039. As of December 31, 2019, the Company also had federal and Massachusetts research and development tax credit carryforwards of $701 and $533, respectively, which are available to offset federal and state tax liabilities through 2039 and 2034, respectively.

Realization of future tax benefits is dependent on many factors, including the Company’s ability to generate taxable income within the net operating loss carryforward period. Net operating loss and tax credit carryforwards may become subject to an annual limitation in the event of certain cumulative changes in the ownership interest of significant shareholders over a three-year period in excess of 50%, as provided under Sections 382 and 383 of the Internal Revenue Code of 1986, as amended, respectively, as well as similar state provisions. These ownership changes may limit the number of carryforwards that can be utilized annually to offset future taxable income. In general, an ownership change, as defined by Section 382, results from transactions increasing the ownership of certain shareholders or public groups in the stock of a corporation by more than 50% over a three-year period. The Company has completed several financings and has conducted a study to assess whether a change of control has occurred or whether there have been multiple changes of control since inception and has determined that an ownership change did occur in March 2017. Accordingly, utilization of $12,400 of the U.S. net operating loss carryforwards which were incurred prior to March 2017 (pre-ownership change) is limited under Section 382. After the Section 382 limitations, the Company may utilize approximately $10,800 of its pre-ownership change net operating loss carryforwards based upon an annual usage of approximately $1,600 for each of the next five years after the ownership change and approximately $180 for each of the 15 years thereafter. The remaining pre-ownership change net operating losses of approximately $1,600 were written off due to expiration under limitation. The limitation has been determined by first multiplying the value of our stock at the time of the ownership change by the applicable long-term tax-exempt rate. These carryforwards may be subject to further annual limitations under Section 382 in the event of future changes in ownership. Additionally, the Company has determined an ownership changed occurred in October of 2019 as a result of the IPO. Accordingly, utilization of approximately $46,123 of the U.S. net operating loss carryforwards incurred prior to October 2019 is also limited under Section 382. The Company has determined it will be able to utilize the entire $46,123 of its pre-ownership change net operating loss carryforwards based upon the limitations calculated from the October 2019 ownership change. These carryforwards may be subject to further annual limitations under Section 382 in the event of future changes in ownership.

ASC 740 requires a valuation allowance to reduce the deferred tax assets reported if, based on the weight of the evidence, it is more likely than not that some portion or all of the deferred tax assets will not be realized. After consideration of all the evidence, both positive and negative, the Company has recorded a valuation allowance against its deferred tax assets at December 31, 2019 and 2018 because the Company’s management has determined that it is more likely than not that the Company will not recognize the benefits of its federal and state deferred tax assets primarily due to its cumulative loss position and, as a result, a valuation allowance of approximately $16,204 and $12,229 as of December 31, 2019 and 2018 has been established.

The Company has no unrecognized tax benefits. The Company has not, as yet, conducted a study of its research and development credit carryforwards. Such a study may result in an adjustment to the Company’s research and development credit carryforwards; however, until a study is completed, and any adjustment is known, no amounts are being presented as an uncertain tax position. A full valuation allowance has been provided against the Company’s research and development credits and, if an adjustment were required, this adjustment would be offset by an adjustment to the valuation allowance. Thus, there would be no impact to the consolidated balance sheet or consolidated statements of operations if an adjustment were required. The Company has elected to recognize interest and penalties related to income tax matters as a component of income tax expense, of which no interest or penalties were recorded for the years ended December 31, 2019 and 2018.

The Company files income tax returns in the U.S. and Massachusetts. The statute of limitations for assessment by the Internal Revenue Service and Massachusetts tax authorities remains open for all years since 2014. To the extent the Company has tax attribute carryforwards, the tax years in which the attribute was generated may still be adjusted upon examination by the Internal Revenue Service or state authorities to the extent utilized in a future period. No federal or state tax audits are currently in process.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

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