The maximum failure-to-file penalty for a late tax return is generally 25% of the unpaid tax owed, accrued at a rate of 5% per month or partial month. If the return is over 60 days late, the minimum penalty is the lesser of 100% of the unpaid tax or $525 for 2026 returns ($510 in 2025).
The IRS charges penalties for failing to file (usually 5% per month, max 25%) and failing to pay (0.5% per month, max 25%), plus interest, but both penalties are reduced if you're on an approved payment plan. A separate, higher penalty applies if you don't pay within 10 days of an IRS levy notice. Paying as much as possible by the deadline and setting up a payment plan are key to minimizing costs.
If you file taxes after the October 15 extension deadline, the IRS will assess penalties and interest, primarily a failure-to-file penalty (5% per month, max 25%), plus a separate failure-to-pay penalty (0.5% per month) and daily interest on the unpaid taxes, though you can request penalty abatement for reasonable cause like natural disasters. The October deadline is for filing, not paying; if you owe, payment was due in April, so you'll likely face both penalties and interest until you file and pay, but you won't be penalized if you're due a refund.
The 'Failure to Lodge on Time' (FTL) Penalty
This penalty is not a flat fee; it is calculated using a system of 'penalty units' that increase every 28 days your return is overdue.
The IRS offers a few penalty relief programs and payment options – such as payment plans and an Offer in Compromise program – to manage or reduce the financial burden if you can't pay your tax bill right away. If you're expecting a refund, there are no penalties or interest charges for filing late.
If you have a balance owing, the CRA may charge interest and a late-filing penalty on returns filed after the due date. If you file your return after April 30, your GST/HST credit, climate action tax credit, Canada child benefit and B.C. family benefit, and Old Age Security benefit payments may be delayed.
A reasonable excuse is something that stopped you meeting a tax obligation for a valid reason, for example: your partner or another close relative died shortly before the tax return or payment deadline. you had an unexpected stay in hospital that prevented you from dealing with your tax affairs.
If you don't file taxes for a year and owe money, you face significant penalties and interest, including a 5% per month failure-to-file penalty (up to 25%), a separate failure-to-pay penalty, and accruing interest, potentially leading to wage garnishment, bank levies, and even criminal charges in extreme cases; however, if you are due a refund, there's no penalty, but you must file within three years to claim it.
The penalty will be a percentage of the taxes you either didn't pay or didn't report on your return. The IRS charges 0.5% of your unpaid taxes for each month or part of a month that your taxes remain unpaid. The failure to pay penalty has a maximum charge of 25% of your unpaid taxes.
You can avoid a penalty by filing and paying your tax by the due date. If you can't do so, you can apply for an extension of time to file or a payment plan.
But here's generally what you can expect. No penalty if you're getting a tax refund. However, you must file your 2025 taxes by April 15, 2029 (or October 15, 2029 if you filed an extension). After that, any unclaimed tax refund gets turned over to the US Treasury.
One-time forgiveness, officially known as First-Time Penalty Abatement (FTA), is an IRS program that allows qualified taxpayers to have certain penalties removed from their tax accounts.
If you don't file your tax return by the October 15 extension deadline, the IRS charges a failure-to-file penalty of 5% per month (up to 25%) on unpaid taxes, plus a failure-to-pay penalty (0.5% per month), and interest on the total amount due, potentially leading to significant costs, though you can request penalty abatement for reasonable cause, and if you're owed a refund, you generally won't face penalties but risk losing your refund if you wait too long (usually over 3 years).
If 31 October falls on a weekend, the due date to lodge your tax return is the next business day after 31 October. If you choose to use the services of a registered tax agent, they will generally have special lodgment schedules and can lodge returns for clients later than 31 October.
The biggest tax mistakes people make include filing late, math errors, incorrect personal info (like Social Security numbers), forgetting deductions/credits (like EITC), misreporting income, not signing forms, and making errors with bank details for direct deposit, all leading to delays, penalties, or missed savings, with using tax software or professionals helping avoid these common pitfalls.
You cannot legally go even one year without filing taxesif your income exceeds IRS filing requirements. Unfiled tax returns remain open indefinitely because the statute of limitations never begins until you file. The IRS can take action at any time, no matter how many years have passed.
Sound reasons, if established, include: Fire, casualty, natural disaster or other disturbances. Inability to obtain records. Death, serious illness, incapacitation or unavoidable absence of the taxpayer or a member of the taxpayer's immediate family.
“Reasonable Excuse” Appeal against a Late Tax Return Penalty. Late filing penalties can be cancelled if you has a “reasonable excuse” for the late filing. Prior to an appeal being lodged, the taxpayer must send a tax return or have told HMRC that there is no need to complete one.
The IRS can waive penalties if you demonstrate that your failure to comply with tax requirements was due to reasonable cause. Acceptable reasons include serious illness, natural disasters, or other events beyond your control that prevented timely tax filing or payment.
Most taxpayers will do anything they can to avoid tax audits. Filling out an accurate tax return is the best way to avoid an audit. Additionally, you should ensure you double-check your math and only claim legitimate tax deductions. E-filing may also be helpful.
The Central Board of Direct Taxes (CBDT) has extended the deadline for filing Income Tax Returns for individuals who were earlier required to file by 31 July 2025. The revised deadline is now 16 September 2025.