Client Q&A: The Extension Questions We're Getting This Month
Extensions create a strange mix of relief and confusion: more time to file, but not necessarily more time to pay, fund, or fix everything else. These are the questions clients are asking us most often as the September and October deadlines get closer.
"I filed an extension back in March. Doesn't that mean I don't owe anything until I actually file?"
This is the single most common misunderstanding we see every year, for both individual and business returns. An extension — Form 7004 for partnerships, S corporations, and C corporations, or Form 4868 for individuals — extends the time to file the return. It does not extend the time to pay. Any tax owed was generally due back at the original deadline (March 16 for calendar-year partnerships and S corps this year, April 15 for individuals and calendar-year C corps), and interest has been accruing since then on any unpaid balance, regardless of the extension. The extension protects against the failure-to-file penalty, not the failure-to-pay penalty or accruing interest.
"My partnership missed the September 15 extended deadline. How bad is this, really?"
It depends heavily on the number of partners and how many months late the return ends up being, since the penalty is calculated per partner, per month. It also depends on the partnership's compliance history — a partnership that's never had this issue before may qualify for first-time abatement, and a small partnership with a straightforward ownership structure may separately qualify for a specific reasonable-cause exception. The honest answer is: it's worth getting the actual return filed as soon as possible and then addressing the penalty separately, rather than waiting to resolve the penalty question before filing.
"Can I still contribute to a SEP-IRA if I'm on extension?"
Generally, yes — this is one of the more useful features of being on extension. A SEP-IRA can typically be funded up to the extended due date of the business or individual return, which gives meaningfully more time than the unextended deadline would. The specific extended due date that applies depends on the entity type and whether a valid extension was actually filed, so it's worth confirming the exact date rather than assuming.
"I can't pay what I owe by October 15. What are my actual options?"
There are several, and none of them require simply not filing. Filing the return on time (even without full payment) avoids the failure-to-file penalty, which is generally more expensive than the failure-to-pay penalty. From there, options generally include a short-term payment plan, a longer-term installment agreement, or — in genuine hardship situations — other collection alternatives. The one option that reliably makes things worse is not filing at all while waiting to figure out how to pay.
"Does filing on extension increase my audit risk?"
There's no reliable evidence that filing a valid extension, by itself, changes the likelihood of examination. Returns get selected for a variety of reasons — some based on specific items on the return, some based on broader compliance programs — and the extension itself is a routine, common filing choice used by a large share of business returns every year. What matters more for audit exposure is the accuracy and documentation behind the numbers on the return, not the filing date.
"What happens if I already filed my extension late, or didn't file one at all?"
At that point, the return is simply late, and the relevant question becomes the same as for any late return: how late, why, and what the entity's or individual's broader compliance history looks like. It's not a dead end — it's a different starting point for the same conversation about penalties and relief options.
As always, these answers reflect general rules and common situations — not a review of any particular return. If one of these questions sounds like your situation, it's worth a conversation rather than assuming the general answer applies exactly to your facts.
Related service: IRS Resolution & Representation
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