MerchantFinancial Advisory
Home / Insights / Tax Deadlines
MFA Insights

Tax Deadlines guides

IRS, New Jersey and New York filing deadlines, extensions and penalties, explained with the dates you need to save. Need it handled for you? See our tax deadlines services.

Keep-handy guide to filing a late 2025 tax return. Key numbers: failure-to-file penalty 5% of unpaid tax a month, up to 25%; failure-to-pay penalty 0.5% a month, up to 25%; minimum penalty of $525 or 100% of the tax owed, whichever is less, once a return is more than 60 days late; interest 7% a year compounded daily for Oct. to Dec. 2026. Timeline: April 15, 2026 original due date and payment date; Oct. 15, 2026 extended due date; Dec. 14, 2026 is 60 days after Oct. 15, the last day for extension filers to avoid the minimum penalty; April 2029 the 3-year window to claim a 2025 refund closes. Steps: file now even if you can't pay, pay what you can, set up an IRS payment plan for the rest, check for automatic penalty relief if you filed and paid on time the 3 prior years, file now if you're owed a refund, and file your New Jersey return too.
Tax Deadlines · Nov 4, 2026

Filing Taxes Late: Missed Oct. 15? What to Do Now for Your 2025 Return

Filing taxes late after Oct. 15? What a late 2025 return costs, why Dec. 14 matters if you extended, IRS payment plans and new automatic penalty relief.

Read the article →
NJ sales tax ST-50 one-page guide. New Jersey sales tax rate 6.625 percent. Quarterly ST-50 due dates: fourth quarter 2026 due January 20, 2027; first quarter 2027 due April 20, 2027; second quarter due July 20, 2027; third quarter due October 20, 2027. File every quarter, even with no sales. Monthly payments are required if you collected more than $30,000 of New Jersey sales and use tax in the prior calendar year and more than $500 in the first or second month of a quarter. All returns are filed electronically through the NJ Tax Portal; you can file as a guest with your taxpayer ID, business name and account type.
Tax Deadlines · Oct 23, 2026

NJ Sales Tax: How to File the ST-50 Online and Quarterly Due Dates

How NJ sales tax filing online works: the ST-50 quarterly return, the 20th-of-the-month due dates, monthly payments over $30,000 and filing as a guest.

Read the article →
Which tax form does my business file? One-page guide for calendar-year 2026 returns. Single-member LLC or sole proprietor: Schedule C with Form 1040, due April 15, 2027, the owner pays income and self-employment tax. LLC with two or more members: Form 1065, due March 15, 2027, members pay through Schedules K-1. S corporation, including an LLC that filed Form 2553: Form 1120-S, due March 15, 2027, shareholders pay through Schedules K-1. C corporation, including an LLC that filed Form 8832: Form 1120, due April 15, 2027, the corporation pays 21 percent. Form 7004 extends business returns six months; Form 4868 extends Form 1040.
Tax Deadlines · Oct 21, 2026

How to File Taxes for an LLC: Which Tax Form? Schedule C, 1065, 1120-S or 1120

How to file taxes for an LLC or corporation: Schedule C, Form 1065, 1120-S or 1120, the 2027 due date for each, and who pays the tax.

Read the article →
Form 1065 for LLCs one-page guide. Who files: LLCs with two or more members taxed as partnerships; single-member LLCs usually use Schedule C instead. Due dates for 2026 returns: March 15, 2027; September 15, 2027 with Form 7004; NJ-1065 April 15, 2027. Late penalty $260 per partner per month, up to 12 months. Steps: confirm classification, close the books, page 1, Schedule B, Schedule K, a K-1 for each member, L, M-1 and M-2 unless exempt, file and send K-1s.
Tax Deadlines · Oct 20, 2026

Form 1065 for LLCs: Who Files, Due Date, K-1s, Step by Step

Form 1065 for LLCs in plain English: which LLCs file it, the March 15, 2027 due date, K-1s for each member, the $260 late penalty and a step-by-step guide.

Read the article →
New Jersey property tax relief: one PAS-1 form, three programs, apply by Nov. 2, 2026. ANCHOR pays homeowners up to $1,500 and renters $450 ($700 if 65+). Stay NJ pays homeowners 65+ up to $6,500. Senior Freeze income limit $172,475 for 2025.
Tax Deadlines · Oct 13, 2026

ANCHOR Deadline 2026: NJ Property Tax Relief Is Due Nov. 2

The ANCHOR deadline for 2026 is Nov. 2. One PAS-1 form covers ANCHOR, Stay NJ (up to $6,500) and Senior Freeze. Who qualifies, amounts and who must file.

Read the article →
2027 tax calendar at a glance: Feb. 1 W-2s and 1099s; March 15 partnership and S corporation returns; April 15 individual returns, corporate returns and first estimated payment; June 15 and Sept. 15 estimated payments; Oct. 15 extended returns; Jan. 18, 2028 fourth-quarter estimate
Tax Deadlines · Oct 12, 2026

2027 Tax Calendar: Key IRS, New Jersey and New York Tax Deadlines

The 2027 tax calendar: every key IRS deadline plus New Jersey and New York due dates, from 1099s and W-2s to April 15 and estimated taxes. Save it to your calendar.

Read the article →
Keep-handy guide to the October 15, 2026 tax extension deadline: timeline, penalty amounts, and a pre-deadline checklist
Tax Deadlines · Oct 9, 2026

October 15, 2026 Tax Extension Deadline: What to Do Before It Hits

Filed an extension for your 2025 return? Your deadline is Thursday, Oct. 15, 2026. What to file, what waiting costs, and the NJ and disaster-area exceptions.

Read the article →
MFA Insights newsletter

Get key tax dates and new articles by email

Every new MFA Insights article, the IRS, New Jersey and New York deadlines that matter, and a calendar you can save. For individuals and small and mid-sized businesses.

Up to 3 short emails a week. Unsubscribe from any email in one click. We never sell or share your address. Privacy Policy.

Talk to MFA

Have a question about your taxes, books, or QuickBooks?

Book a 30-minute consultation to talk through your taxes, accounting, or QuickBooks setup, or email us at [email protected]. We provide accounting, tax and business solutions for individuals and small and mid-sized businesses in New Jersey, New York and nationwide.