Extended Returns and FBARs Due Oct. 15: Do This Now

Thursday, Oct. 15 is the deadline for extended 2025 federal returns, FBARs filed on the automatic extension, and Solo 401(k) or SEP IRA contributions that depend on an extension.

If you run a store through a sole proprietorship or a single-member LLC and filed Form 4868 in April, your return is due in five days, and the tax on it was due in April. If you bank or live abroad, a foreign account report lands on the same date. For a reader of Ecommerce Paradise, that matters because a high-ticket store can post a five-figure tax bill on thin net margins, and the IRS penalty clock runs by the month on whatever is unpaid.

Below is what the IRS pages and Kiplinger say is due, why the extension trips up store owners, what a miss costs in hypothetical math, and five moves to make before Thursday. If you have not read my walkthrough of how Form 4868 works, skim it first. This is reported information, not tax advice. I am not a financial or legal advisor or a CPA, so run your numbers past one.

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Oct. 15 Extension Deadline: Returns, FBARs and Retirement Plans

The IRS says an extension “gives you until October 15 to file without penalties,” according to its extension page, last updated Sept. 20, 2026. The same page says “The extension is only for filing your return,” so any tax owed was due in April.

The penalty math sits on the IRS failure-to-file page, updated Oct. 5, 2026. The failure-to-file penalty is 5% of the tax due for each month or partial month late, capped at 25%. For returns due after Dec. 31, 2025 that are more than 60 days late, the minimum is $525 or the tax owed, whichever is less. The failure-to-pay penalty is 0.5% a month, and it reduces the failure-to-file penalty in months when both apply.

The crowd is large. A syndicated al.com report published Oct. 6 on CPA Practice Advisor says as many as 20 million Americans, roughly 15% to 20% of all filers, request an extension each year. The report also says refunds tied to an extension stay on hold until the return is actually filed.

Kiplinger, in an article updated Oct. 6, adds the details store owners miss. The IRS does not charge the failure-to-file penalty if you had no tax liability or are due a refund. Most state extensions also fall on Oct. 15, though Kiplinger lists Virginia at Nov. 1 and Louisiana at Nov. 15, and says some states will not extend if you owe tax.

Retirement plans share the date. Per Kiplinger, sole proprietors and C corporations with a valid extension can fund a 2025 SEP IRA or Solo 401(k) until Oct. 15, while S corporations and partnerships had until Sept. 15. The Solo 401(k) caps Kiplinger lists for 2025 are $70,000 under age 50, $77,500 for ages 50 to 59, $81,250 for ages 60 to 63, and $77,500 at 64 and older, all limited to 100% of net self-employment income.

Then there is the foreign account report. The IRS FBAR page, updated July 30, 2026, says the report is due April 15 and carries an automatic extension to Oct. 15: “You don’t need to request an extension to file the FBAR.” The trigger is foreign accounts whose aggregate value exceeded $10,000 at any time in the calendar year, and individuals can file through FinCEN’s BSA E-Filing system.

For readers living abroad, BrightTax reported through Nomad Watch on Oct. 6 that expats get an automatic extension to June 15 and can add Form 4868 to reach Oct. 15. The payment deadline does not move for them either.

Why the Extension Only Moves Your Filing Date, Not Your Payment

The mistake is simple and expensive. Filing Form 4868 feels like filing for more time on everything, so owners treat October as the month the bill arrives. The IRS page says otherwise, and every penalty above starts counting from April on the unpaid amount.

The IRS fourth-quarter tax calendar, updated Sept. 1, 2026, lists several items for Oct. 15: Form 1040 for individuals who requested a six-month extension, Form 3520 for those who extended it, Form 1120 for calendar-year corporations that extended, and September payroll deposits for monthly depositors. If you run payroll for a VA team or an office, that last item is a separate clock from your own return.

Store owners also get tripped by income reporting. The IRS Form 1099-K page, updated June 28, 2026, shows a reporting threshold of more than $20,000 across more than 200 transactions, and warns that a platform “may send you a Form 1099-K with lower amounts and/or transactions.” Your return still reports all of your income, form or no form. My walkthrough of filing taxes as an ecommerce seller covers that reconciliation.

Washington is not coming to help before Thursday. The Senate passed the 65-provision Taxpayer Assistance and Service Act unanimously on Oct. 1, according to the Journal of Accountancy, but the House is in recess until November. Whatever those 65 provisions change, none of it arrives before Thursday.

One counterpoint cuts the other way. If you owe nothing or you are due a refund, the failure-to-file penalty does not apply, per Kiplinger, and some taxpayers have later dates. Kiplinger lists disaster-area relief running to Nov. 2, 2026 for certain Wisconsin and Michigan storm victims, and as late as Feb. 1, 2027 in other declared disaster areas. The IRS also posted additional relief for taxpayers affected by events in Israel on Sept. 30, which it says postpones a range of deadlines to Sept. 30, 2027, according to its newsroom listing. If one of those applies to you, confirm your own date before you rush.

What Missing Oct. 15 Costs a One-Person LLC Store

My read is that the real exposure is not the penalty on a small bill. It is the combination of thin margins, uneven cash and a bill nobody planned for. A high-ticket store can run a million dollars through Shopify and keep single digits, and the tax lands on profit while the cash sits in inventory, ad spend and chargeback reserves.

Here is hypothetical math, not a reported figure. Say a store grosses $1,000,000 and nets 8%, or $80,000. If the owner’s combined federal tax comes to $24,000 and nothing was paid in April, a return filed three months late would carry roughly 13.5% in failure-to-file penalty and 1.5% in failure-to-pay penalty, or about $3,600, before interest and any state penalty. File by Oct. 15 and pay what you owe, and that first number shrinks fast.

The scenarios have thresholds. If you owe nothing and filed Form 4868, Oct. 15 is housekeeping. If you owe a balance, every extra month costs about 5% of it, so file and pay now even if you can only pay part. If you owe more than you can pay, the IRS offers payment plans, and the CPA Practice Advisor report lists IRS Direct Pay, the Electronic Federal Tax Payment System and card payments as options.

Cash flow is where the owner stories go wrong. I wrote about why your ecommerce payout is not your profit, and tax is the cleanest example. The deposit from Shopify or a processor is revenue minus fees and holds, and none of it accounts for tax. Books built on payouts alone will understate what you owe.

That is a bookkeeping problem, and tools solve it. I’d pair a clean ledger like QuickBooks with a Shopify-specific reconciler. Finaloop is one, and it makes profit reflect refunds, chargebacks and fees.

If you prefer a lighter ledger, Xero does the job. I compared the options in my guide to tax software for ecommerce sellers.

The nomad version is its own risk. If you keep balances in several currencies, ask your CPA whether each account counts toward the FBAR, because I would not guess on a $10,000 aggregate test. Providers such as Wise make multi-currency banking easy, which is exactly why a year-end list of every account you touched is worth building. My notes on FATCA reporting for expats sit next to this one.

The retirement window is the part I’d treat as an opportunity. If you filed an extension and have profit, a Solo 401(k) or SEP IRA contribution can still count for 2025, per Kiplinger. Whether a plan you have not opened yet qualifies is a question for your CPA, and my breakdown of the best retirement accounts for store owners shows how the options differ. A brokerage such as Schwab is one place to hold a Solo 401(k).

Run the whole back office this way and it becomes a second job. Which is why more owners ask my team to build and run the store itself through the turnkey done-for-you service, so deadlines like this one stop landing on the same person who is also sourcing suppliers and tuning Google Shopping.

Tax deadlines are the price of doing every job yourself, so let my team build and run the high-ticket store while you keep the books straight. See the turnkey done-for-you service →

Five Moves to Make Before Thursday, Oct. 15

Here are five moves, in order:

Confirm that your Form 4868 was accepted, or file a return now. If you owe tax and never extended, file immediately, because the failure-to-file penalty has been running since April. My picks for self-employed filers list software that handles Schedule C and single-member LLC returns.
Pay what you owe through IRS Direct Pay, which the IRS describes as free and secure with no sign-in required. Pay as much as you can even if it is not the full amount, since both penalties run on the unpaid balance. The best credit cards for paying ecommerce business taxes are worth a look only after you compare card fees to the penalty.
If you have foreign accounts, add up the highest balance for each one in 2025 and test the $10,000 aggregate. File the FBAR through BSA E-Filing by Oct. 15, and talk to a CPA first if you are unsure whether a payment or wallet account counts. If you want a longer list of nomad tax tasks, my guide to filing taxes as an expat covers them.
Decide on a Solo 401(k) or SEP IRA for 2025 before Thursday. If you have net profit, ask your CPA whether a contribution makes sense and whether a new plan qualifies. Gather the plan paperwork and funding details now, because a bank holiday or transfer delay will not move the date.
Fix the process, not just the return. Ask your CPA to set up quarterly estimated payments for the rest of 2026 so next April is not another surprise. If you want a person to walk through your numbers, book a call at my discovery page.

One extra step for nomads: IRS notices land at your mailing address, not where you are. A virtual mailbox keeps them from sitting in a drawer for a month. My roundup of virtual mailbox services for digital nomads compares the main ones. Traveling Mailbox is one of them.

Frequently Asked Questions

Does filing Form 4868 give me more time to pay?
No. The IRS says the extension is only for filing, so tax owed was due in April, and interest and penalties accrue on what you did not pay. My Form 4868 explainer covers the mechanics.

Do I need to request an extension for the FBAR?
No. The IRS says an FBAR filer gets an automatic extension to Oct. 15 and does not need to request it. The filing threshold is foreign accounts whose aggregate value exceeded $10,000 at any time during the year.

What is the penalty if I miss Oct. 15 and owe tax?
The IRS lists 5% of the unpaid tax per month for failure to file, capped at 25%, plus 0.5% per month for failure to pay. A minimum of $525 or the tax owed, whichever is less, applies if the return is more than 60 days late. See my breakdown of Amazon FBA taxes if marketplace payouts are part of your math.

Can I still fund a Solo 401(k) or SEP IRA for 2025?
Kiplinger says sole proprietors and C corporations with a valid extension can fund these until Oct. 15, and that S corporations and partnerships had until Sept. 15. Ask a CPA whether a plan you have not yet opened qualifies, and compare options in Schwab vs Vanguard.

Does a single-member LLC change when I file?
A single-member LLC is generally taxed as a disregarded entity unless it elects otherwise, so its income typically flows to your personal return and the Oct. 15 date applies. If you do not have an LLC yet, Bizee is another formation option. My post on how long an LLC takes to get covers timing.

Where do I start if I am new to high-ticket stores?
Start with my pillar guide to what high-ticket dropshipping is. Then grab the free niches list and pick a category before you worry about tax strategy.

Want to work through deadlines like this with other store owners and me inside the community? Join the Skool community →

That is the deadline. Put Thursday on your calendar, pay what you can, and send your accountant the 2025 numbers today. Subscribe to the YouTube channel for daily breakdowns. More breaking news coming through the day.

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Trevor Fenner

Trevor Fenner is an ecommerce entrepreneur and the founder of Ecommerce Paradise, a platform focused on helping entrepreneurs build and scale profitable high-ticket ecommerce and dropshipping businesses. With over a decade of hands-on experience, Trevor specializes in high-ticket dropshipping strategy, niche and product selection, supplier recruiting and onboarding, Google & Bing Shopping ads, ecommerce SEO, and systems-driven automation and scaling. Through Ecommerce Paradise, he provides free education via in-depth guides like How to Start High-Ticket Dropshipping, advanced training through the High-Ticket Dropshipping Masterclass, and fully done-for-you turnkey ecommerce services for entrepreneurs who want a faster, more hands-off path to growth. Trevor is known for emphasizing sustainable, real-world ecommerce models over hype-driven tactics, helping store owners build scalable, sellable, and location-independent brands.