Who must file? Form 1040 (or a variant thereof) is the main tax form filed by individuals who are deemed residents of the United States for tax purposes. The corresponding main form filed by businesses is
Form 1120, also called the U.S. Corporation Income Tax Return. An individual is considered a resident of the United States for tax purposes if he or she is a citizen of the United States or a resident alien of the United States for tax purposes. An individual is a resident alien of the United States if he or she passes either the
Substantial Presence Test or the
Green Card Test, although there are also some other cases; individuals who have taxable income in the United States but fail the criteria for being resident aliens must file as nonresident aliens for tax purposes. While residents of the United States for tax purposes file Form 1040, nonresident aliens must file Form 1040NR or 1040NR-EZ. There is also a "dual status alien" for aliens whose status changed during the year. Resident aliens of the United States for tax purposes must generally file if their income crosses a threshold where their taxable income is likely to be positive, but there are many other cases where it may be legally desirable to file. For instance, even if not required, individuals can file a return in order to receive a refund on withheld income or to receive certain credits (e.g.
earned income tax credit). Finalized versions of the forms for the tax year (which in the US is the same as the calendar year) are released near the end of January of the following year. Paper forms can be filled and saved electronically using a compatible PDF reader, and then printed. This way, it is easy to keep electronic copies of one's filled forms despite filing by paper. Alternatively, they can be printed out and filled by hand. A combination of the approaches may also be used, with some content filled in electronically and additional content written in by hand. As a general rule, where possible, it makes sense to fill electronically, but in some cases filling by hand may be necessary (for instance, if additional notes of explanation need to be added, or the font used for electronic filling is too large to fit the information in the space provided). The only parts of the form that cannot be filled electronically are the signature lines. The paper Form 1040, along with all relevant schedules and additional forms, must be sent in a single packet by mail or courier to an IRS address determined by the US state the taxpayer is filing from and whether or not a payment is enclosed. The IRS accepts returns that are stapled or paperclipped together. However, any check or payment voucher, as well as accompanying Form 1040-V, must
not be stapled or paperclipped with the rest of the return, since payments are processed separately. • Those with incomes of $66,000 or less may file electronically using IRS Free File, a free e-filing tool (there are some other conditions necessary to be eligible for free filing; in particular, some kinds of income and deductions cannot be handled by free filing). • It is possible to prepare one's tax return using a
tax compliance software approved by the IRS and have the software file the return electronically. • One can use a tax professional who has been accepted by the IRS for electronic filing. Many paid tax preparers are required to file individual tax returns electronically, and most
tax compliance software file electronically on the taxpayer's behalf. Even the tax preparers who are not so required, must file Form 8948 if they choose paper filing, providing an explanation for why they are not filing electronically.
Comparison If one is not eligible for IRS Free File, depending on the company used it might cost hundreds of dollars to file electronically, whereas paper filing has no costs beyond those of printing and mailing. Furthermore, the available existing electronic filing options may not offer sufficient flexibility with respect to arranging one's tax return, adding attachments, or putting written notes of explanation that can help preempt IRS questions. In the past, filing electronically may have exposed the taxpayer's data to the risk of accidental loss or
identity theft, but now e-filing with reputable companies is considered more secure than paper filing.
Signature requirement Form 1040 must be signed and dated in order to be considered valid. If filing jointly with a spouse, both must sign and date. If a return is submitted electronically, individuals must use either a Self-Select PIN or Practitioner PIN.
Substitute return If an individual decides not to file a return, the IRS may (after it has sent several reminders) file a substitute return. ==Variants==