Interest on mortgages taken out after Dec. 15, 2017 of up to $750,000, or $375,000 if you're married filing jointly, or $375,000 if you're married and filing separately, provided that the funds are used to "purchase, construct, or make substantial improvements" to your primary or secondary residence. The maximum amount for mortgages originated on or before December 15, 2017 is $1,000,000, or $500,000 for married filing separately.
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Tax accounting in the United States concentrates on the preparation, analysis and presentation of tax payments and tax returns. The U.S. tax system requires the use of specialised accounting principles for tax purposes which can differ from the generally accepted accounting principles (GAAP) for financial reporting.[42] U.S. tax law covers four basic forms of business ownership: sole proprietorship, partnership, corporation, and limited liability company. Corporate and personal income are taxed at different rates, both varying according to income levels and including varying marginal rates (taxed on each additional dollar of income) and average rates (set as a percentage of overall income).[42]

Those who qualify as head of household have higher income thresholds apply to each tax bracket, resulting in lower tax. To qualify as a head of household, the requirements include that you be unmarried and provide both housing and financial support for a child, parent, or other relative who lives with you for greater than half of the year. The financial support you provide must generally be more than half of all support the child or other relative received during the year.
The history of accounting is thousands of years old and can be traced to ancient civilizations.[12][13][14] The early development of accounting dates back to ancient Mesopotamia, and is closely related to developments in writing, counting and money;[12] there is also evidence of early forms of bookkeeping in ancient Iran,[15][16] and early auditing systems by the ancient Egyptians and Babylonians.[13] By the time of Emperor Augustus, the Roman government had access to detailed financial information.[17]
Accounting or accountancy is the measurement, processing, and communication of financial and non financial information about economic entities[1][2] such as businesses and corporations. Accounting, which has been called the "language of business",[3] measures the results of an organization's economic activities and conveys this information to a variety of users, including investors, creditors, management, and regulators.[4] Practitioners of accounting are known as accountants. The terms "accounting" and "financial reporting" are often used as synonyms.
Both the words accounting and accountancy were in use in Great Britain by the mid-1800s, and are derived from the words accompting and accountantship used in the 18th century.[26] In Middle English (used roughly between the 12th and the late 15th century) the verb "to account" had the form accounten, which was derived from the Old French word aconter,[27] which is in turn related to the Vulgar Latin word computare, meaning "to reckon". The base of computare is putare, which "variously meant to prune, to purify, to correct an account, hence, to count or calculate, as well as to think".[27]
A single taxpayer who has $13,000 in itemized deductions would do better to itemize than to claim the standard deduction. That's an additional $800 off his taxable income, the difference between $13,000 and $12,200. But a taxpayer who has only $9,000 in itemized deductions would end up paying taxes on $3,200 more in income if she itemizes rather than claims the standard deduction for her single filing status.
Accounting is one of the key functions for almost any business. It may be handled by a bookkeeper or an accountant at a small firm, or by sizable finance departments with dozens of employees at larger companies. The reports generated by various streams of accounting, such as cost accounting and managerial accounting, are invaluable in helping management make informed business decisions. 
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