The October 15 Extension Deadline: What Self-Employed Women Should Do This Week

In April you filed an extension, felt a week of relief, and moved your return into a folder you haven't opened since. That folder has seven days left. Extended individual returns for 2025 are due Thursday, October 15, 2026, and for most people that date is final, because an individual extension is a one-time, six-month grant with no second round. Two things set this deadline apart from the usual last-minute scramble. The IRS now treats penalties differently for people with a clean filing record, and a SEP IRA contribution for 2025 stays open to the self-employed until the same Thursday, long after IRA and HSA contributions closed in April. Both come with conditions that are easy to miss, so read them before you hit submit.

What the Extension Bought You, and What It Didn't

An extension moves the filing date and leaves the payment date exactly where it was.

Any tax you owed for 2025 was due on April 15, 2026, and interest has been accruing on it ever since. For the quarter that began October 1, the IRS is charging individuals 7 percent a year on unpaid tax, compounded daily, the same rate as the previous quarter. On an $8,000 balance that comes to roughly $47 a month, which is less painful than most people fear. The failure-to-pay penalty adds 0.5 percent of the unpaid tax for every month or partial month, up to a cap of 25 percent, so the same $8,000 has also been collecting about $40 a month in penalties since spring. Neither charge disappears when you file, but both stop growing once you pay, which makes sending money in the one move worth making this week even if your return isn't finished. Use IRS Direct Pay, which is free from a bank account, and tag the payment as a 2025 balance due. Card payments go through processors that charge a fee, and a payment labeled as a 2026 estimated payment will not reduce what you owe for 2025.

The Penalty Math, and the New Rule That May Cancel It

Miss October 15 and the failure-to-file penalty is 5 percent of the unpaid tax for each month or partial month, capped at 25 percent. When the payment penalty applies in the same month, the IRS trims the filing penalty to 4.5 percent so the two together equal 5 percent, which means the filing penalty maxes out after five months while the payment penalty keeps running. Filing one month late on that $8,000 balance therefore adds $360, nearly eight times the interest for the same month. A return that is more than 60 days late, meaning filed after mid-December, faces a minimum penalty of $525 or 100 percent of the tax owed, whichever is smaller. If you cannot pay, file anyway, because almost all of the cost of lateness sits in the filing penalty.

This year there is a wrinkle. Under the IRS's new Automatic Exemption from Penalty, which applies to 2025 returns and later, no failure-to-file or failure-to-pay penalty is assessed if you file or pay late. The catch is a clean record: you must have filed the same type of return on time for each of the prior three years, with no penalties assessed on them apart from the estimated tax penalty. For a sole proprietor or single-member LLC owner that return type is your Form 1040, so the test looks at your personal filing history rather than the age of your business. The IRS applies the exemption when your original return finishes processing, mails you a letter, and expects nothing from you, which is a real improvement over first-time abatement, where you had to call or write after the penalty notice arrived. Do not plan around it, though. The exemption covers penalties and leaves interest untouched, and as the IRS describes the test, a late 2025 return would count against you in each of the next three filing seasons. Anyone whose 2022, 2023, or 2024 return was late, or drew a penalty that was never abated, gets no help from it at all.

If You Can't Pay It All

Send what you can by the 15th, file the return, and ask the IRS for time on the rest. An individual can apply online for a short-term plan of up to 180 days when the combined tax, penalties, and interest come to less than $100,000, and the IRS charges no setup fee for that option. A long-term monthly plan is available online if you owe $50,000 or less and have filed every required return, and it carries a setup fee that varies with how you apply and pay. Sole proprietors and independent contractors apply as individuals, not as a business. A payment plan is almost always cheaper than financing the bill on a credit card, whose rate is likely well above the IRS's 7 percent. Interest keeps running during a plan, but if you filed on time, the failure-to-pay rate drops from 0.5 percent to 0.25 percent a month for as long as the plan is approved.

The Deduction That Stays Open Until the Same Day

A SEP IRA contribution for 2025 can be deposited up to the due date of your return including extensions, which for you is October 15, and the IRS says you can even set up the plan that late. For a sole proprietor with no employees the limit is not 25 percent of profit. You subtract half of your self-employment tax from net profit and apply a reduced rate, which works out to 20 percent when you contribute at the maximum 25 percent plan rate. Take $90,000 of Schedule C profit: half the self-employment tax is about $6,358, that leaves roughly $83,642, and the maximum contribution lands near $16,700. In the 22 percent federal bracket that deposit lowers your tax by about $3,700, and you claim it on Schedule 1 of Form 1040, not on Schedule C. The hard ceiling for 2025 is $70,000, a number a business with $90,000 in profit will never approach. Pay the IRS first and fund the SEP second, because the deduction reduces what you owe and does not replace paying it, and keep the deposit receipt dated on or before the 15th.

This window is narrower than it sounds. It belongs to sole proprietors and single-member LLCs that report on Schedule C. If your business is an S corporation or a partnership, the plan deadline follows the business's own return, which for a calendar-year entity on extension was September 15 and has passed. An S-corp owner's contribution is also figured on W-2 salary rather than profit, so the cap is usually far lower. If you have employees who meet the SEP eligibility rules, you must contribute the same percentage for them, which changes the math again. The employee-deferral side of a solo 401(k) follows different timing altogether, so ask your preparer which rules apply before you move a dollar. If you have no plan yet, a SEP can still be opened for 2025, and that is the reason to look at it this week.

A Short Checklist Before You Submit

Whatever you end up owing on Thursday, move the 2026 tax into a separate savings account as the money comes in, so next October is a filing task and not a payment problem. Everything above describes federal rules for tax year 2025 in general terms, so run your own numbers past a CPA or enrolled agent before you submit. The next estimated payment, the fourth-quarter installment for 2026, is due Friday, January 15, 2027.