ONYX

FOR: S CORPORATIONS

File Form 1120-S for the calendar year and pay any tax due. Provide each shareholder with Schedule K-1. To request an automatic 6-month extension, file Form 7004 and submit any required estimated tax. To elect S Corporation status for 2026, file Form 2553.

FOR: PARTNERSHIPS

File Form 1065 for the calendar year and provide each partner with Schedule K-1 or K-3. For entities with foreign partners, file Forms 8804 and 8805. To request an automatic 6-month extension, file Form 7004.

FOR: INDIVIDUALS

File Form 1040 or 1040-SR and pay any tax due. To request an automatic 6-month extension, file Form 4868 and submit any required estimated tax. Pay the first installment of your 2026 estimated tax using Form 1040-ES.

FOR: PARTNERSHIPS

File Form 8813 quarterly payment voucher and pay any tax due.

FOR: CORPORATIONS

File Form 1120 for the calendar year and pay any tax due. To request an automatic 6-month extension, file Form 7004 and submit any required estimated tax.

FOR: INDIVIDUALS & CALENDAR YEAR-END ENTITIES

File Form 3520. To request an automatic 6-month extension, file Form 4868 (individuals) or Form 7004 (entities).

FOR: TAX-EXEMPT ORGANIZATIONS

Deposit estimated tax for the first quarter on unrelated business taxable income. Use Form 990-W to determine the required estimated tax payments.

FOR: HOUSEHOLD EMPLOYERS

File Schedule H with Form 1040 if you paid $2,800 or more to a household employee.

FOR: NON-RESIDENT ALIEN INDIVIDUALS

If you received wages subject to U.S. income tax withholding, file Form 1040-NR. To request an automatic 6-month extension, file Form 4868.

FOR: S CORPORATIONS & PARTNERSHIPS

If you are an S corporation or partnership that filed for an extension, your tax return is now due.

FOR: INDIVIDUALS, SOLE PROPRIETORSHIPS, & C CORPORATIONS

If you are an individual, sole proprietorship, or C corporation that filed for an extension, your tax return is now due.