175 Capital Support for Subsidiaries . In light of operating losses in our mortgage insurance business, Radian Group may be  required to make additional capital contributions to Radian Guaranty in order to support Radian Guaranty’ s ability to continue  writing mortgage insurance in those states that impose certain risk-based capital requirements and/or to maintain approvals by  the GSEs for RMAI to operate as an eligible insurer in certain states. Radian Group also could be required to provide capital  support to our other mortgage insurance subsidiaries if additional capital is required pursuant to insurance laws and regulations.  Certain of our mortgage insurance subsidiaries that provide reinsurance to Radian Guaranty have operated at or near minimum  capital levels and have required, and in the future may again require, additional capital contributions from Radian Group. See  “ Insurance Regulatory — Capital Requirements”  above in this Note 1 for further information. Dividends . Our quarterly common stock dividend is $0.0025 per share. Assuming that our outstanding common stock  remains constant at 133,647,216 shares (the number of shares outstanding at  December 31, 2012), we would require  approximately $1.3 million in the aggregate to pay our quarterly dividends for the next 12 months. Radian Group is not subject  to any limitations on its ability to pay dividends except those generally applicable to corporations, such as Radian Group, that  are incorporated in Delaware. Delaware corporation law provides that dividends are only payable out of a corporation’ s capital  surplus or (subject to certain limitations) recent net profits.  As of December 31, 2012, our capital surplus was $734.8 million,  representing our dividend limitation under Delaware law .  Tax Payments . Under our current tax-sharing agreement between Radian Group and its subsidiaries, our subsidiaries are  required to pay to Radian Group, on a quarterly basis, amounts representing their separate company tax liability for the current  tax year. Radian Group is required to refund to each subsidiary any amount that such subsidiary overpaid to Radian Group for a  taxable year, as well as any amount that the subsidiary could utilize through existing carryback provisions of the Internal  Revenue Code (“IRC”) had such subsidiary filed its federal tax return on a separate company basis.  Any payments that we  expect to make during the next twelve months under the tax-sharing agreement are not expected to have a material impact on  Radian Group’s available liquidity. Our tax-sharing agreement may not be changed without the pre-approval of the applicable  state insurance departments for certain of the insurance subsidiaries that are party to the agreement. In addition, pursuant to the  GSE Approvals, the consent of the GSEs is required to modify or amend the tax-sharing agreement. As of the balance sheet date, certain of our insurance subsidiaries, including Radian Guaranty , have incurred net operating  losses (“NOLs”) that could not be carried back and utilized on a separate company tax return basis.  As a result, we are not  currently obligated to reimburse these subsidiaries for their separate company NOL  carryforward. However, if in a future  period our consolidated NOL is fully utilized before a subsidiary has utilized its share of NOL  on a separate entity basis, then  Radian Group may be obligated to fund such subsidiary’ s share of our consolidated tax liability to the Internal Revenue Service  (“IRS”). Currently, we do not expect to fund material obligations under the provisions described in this paragraph with regard  to subsidiary NOLs incurred to date. We are currently contesting proposed adjustments resulting from the examination by the IRS of our 2000 through 2007  tax years. The IRS opposes the recognition of certain tax losses and deductions that were generated through our investment in a  portfolio of non-economic Real Estate Mortgage Investment Conduit (“REMIC”) residual interests and has proposed  adjustments denying the associated tax benefits of these items.  The proposed adjustments relating to the 2000 through 2007 tax  years, if sustained, will result in additional income taxes of approximately  $128 million plus proposed penalties of  approximately $42 million. Additionally, we would incur interest on any sustained adjustments.We appealed these proposed  adjustments to IRS Office of Appeals (“Appeals”) and made “qualified deposits” with the U.S. Department of the  Treasury in  the amount of approximately $85.0 million in June 2008 relating to the 2000 through 2004 tax years and approximately  $4.0  million in May 2010 relating to the 2005 through 2007 tax years in order to avoid the accrual of above-market-rate interest with  respect to the proposed adjustments. In late December 2010, we reached a tentative settlement agreement with  Appeals.  However, because we had claimed a refund of approximately  $105.0 million with respect to our 2006 and 2007 taxable years  based on a carryback of an NOL  generated from our 2008 taxable year , review of the tentative settlement agreement by the  Joint Committee on Taxation (“JCT”) was required. After the JCT completed its review, Appeals reconsidered the tentative  settlement and informed us that it was no longer willing to enter into a settlement based on the originally proposed terms. Radian Group Inc. Notes to Consolidated Financial Statements - (Continued)