Generally, housing demand is negatively impacted by the unavailability of mortgage financing, as a result of tightening of mortgage lending standards and mortgage financing requirements, in addition to factors that increase the cost of financing a home such as elevated interest rates, down payment requirements, insurance premiums or limitations on mortgage interest deductibility. A substantial percentage of our buyers finance their home purchases with mortgage financing. Additionally, deterioration in credit quality among subprime and other nonconforming loans has caused most lenders to eliminate subprime mortgages and most other loan products that do not conform to Federal National Mortgage Association ("Fannie Mae"), Federal Home Loan Mortgage Corporation ("Freddie Mac"), Federal Housing Administration (the "FHA"), or Veterans Administration (the "VA") standards. In addition, requirements relating to residential mortgages and mortgage lending practices that reduce the availability of loans to borrowers or increase the costs to borrowers to obtain such loans have historically resulted in, and could in the future result in, fewer loan products and tighter loan qualifications, in turn, making it more difficult for a borrower to finance the purchase of a new home or the purchase of an existing home from a potential "move-up" buyer who wishes to purchase one of our homes. The foregoing may also hinder our ability to realize our backlog because our home purchase contracts provide customers with a financing contingency. Financing contingencies allow customers to cancel their home purchase contracts in the event that they cannot arrange for adequate financing. As a result, elevated interest rates, stricter underwriting standards, and a reduction of loan products, among other similar factors, can contribute to a decrease in our home sales. Any of these factors could have a material adverse effect on our business, prospects, liquidity, financial condition and results of operations.
The federal government has also taken on a significant role in supporting mortgage lending through its conservatorship of Fannie Mae and Freddie Mac, both of which purchase home mortgages and mortgage-backed securities originated by mortgage lenders, and its insurance of mortgages originated by lenders through the FHA and the VA. The availability and affordability of mortgage loans, including interest rates for such loans, could be adversely affected by a curtailment or cessation of the federal government's mortgage-related programs or policies. Additionally, the FHA may continue to impose stricter loan qualification standards, raise minimum down payment requirements, impose higher mortgage insurance premiums and other costs, or limit the number of mortgages it insures. Due to federal budget deficits, the U.S. Treasury may not be able to continue supporting the mortgage-related activities of Fannie Mae, Freddie Mac, the FHA and the VA at present levels, or it may significantly revise the federal government's participation in and support of the residential mortgage market. Because the availability of Fannie Mae, Freddie Mac, FHA and VA-backed mortgage financing is an important factor in marketing and selling many of our homes, especially as they move down in price point, any limitations, restrictions or changes in the availability of such government-backed financing could reduce our home sales, which could have a material adverse effect on our business, prospects, liquidity, financial condition and results of operations.
Current federal income tax laws cap individual state and local tax deductions at $10,000 for the aggregate of state and local real property and income taxes or state and local sales taxes, and cap mortgage interest deduction to $750,000 of debt ($1,000,000 after 2025) for mortgages taken out after December 15, 2017. Limits on deductibility of mortgage interest and property taxes may increase the after-tax cost of owning a home for some individuals. Any increases in personal income tax rates or additional tax deduction limits could adversely impact demand for new homes, including homes we build, which could adversely affect our results of operations. Furthermore, increases in real estate taxes and other local government fees, such as fees imposed on developers to fund schools, open space, and road improvements, or provide low- and moderate-income housing, could increase our costs and have an adverse effect on our operations. In addition, increases in local real estate taxes as well as the limitation on deductibility of such costs could adversely affect our potential homebuyers, who may consider those costs in determining whether to make a new home purchase and decide, as a result, not to purchase one of our homes or not purchase a resale, which would negatively impact homebuyers that need to sell their home before they purchase one of ours.