ONYX

FOR: S CORPORATIONS

File Form 1120-S for the calendar year and pay any tax due. Furnish a copy of Sch. K-1 to each shareholder. For an automatic 6-month extension, file Form 7004 and deposit estimated tax. File Form 2553 to elect S Corporation status beginning with calendar year 2026.

FOR: PARTNERSHIPS

File Form 1065 for the calendar year and furnish a copy of Sch. K-1 or K-3 to each partner. File Form 8804 and Form 8805 for a calendar year entity. For an automatic 6-month extension, file Form 7004.

FOR: INDIVIDUALS

File Form 1040 or 1040-SR and pay any tax due. For an automatic 6-month extension, file Form 4868 and deposit your 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. For an automatic 6-month extension, file Form 7004 and deposit your estimated tax.

FOR: INDIVIDUALS & CALENDAR YEAR-END ENTITIES

File Form 3520. For an automatic 6-month extension, file an income tax return extension: Form 4868 for individuals or Form 7004 for entities.

FOR: TAX-EXEMPT ORGANIZATIONS

Deposit estimated tax for 1st quarter due on unrelated business taxable income for tax-exempt organizations. Use Form 990-W to determine the amount of estimated tax payments required.

FOR: HOUSEHOLD EMPLOYERS

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

FOR: NON-RESIDENT ALIEN INDIVIDUALS

If you received wages as an employee subject to U.S. income tax withholding, file Form 1040-NR. For 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.