The best way to file back taxes involves gathering documents, using online software or a pro to prepare the specific prior year's forms, mailing paper returns (as e-filing is often limited), and setting up payment plans if you owe, all while prioritizing filing to claim refunds and avoid mounting penalties, using IRS Form 4506-T to get missing wage info if needed.
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.
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.
Acceptable reasons include serious illness, natural disasters, or other events beyond your control that prevented timely tax filing or payment. However, ignorance of the law, relying on an advisor, and lack of funds are generally not treated as reasonable causes.
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.
The IRS $600 rule refers to a change in reporting requirements for third-party payment apps (like Venmo, PayPal) for taxable income from goods and services, where platforms must send a Form 1099-K if you receive over $600 in a year, intended to capture gig economy/side hustle income, though delays and phased implementation have adjusted the timeline, with current rules for 2024 using a higher threshold ($5,000) before fully phasing to $600 for future years, but remember all taxable income, regardless of form, must always be reported.
Sound reasons, if established, include:
The IRS 3-year rule generally refers to the statute of limitations for claiming a tax refund, which is typically 3 years from when you filed your original return or 2 years from when you paid the tax, whichever is later, for the IRS to process your claim. For an audit, the IRS generally has 3 years from the date your return was filed or due (whichever is later) to assess additional tax, though this can extend to 6 years if you significantly underreport income or omit foreign income.
a fire, flood or theft prevented you from completing your tax return. postal delays that you could not have predicted. delays related to a disability or mental illness you have.
The IRS 7-year rule primarily applies to keeping records for claiming a deduction for bad debts or losses from worthless securities, allowing a longer period to file for a credit or refund, but it's not a universal audit limit; it's often a recommended safe buffer for general record-keeping, with the standard IRS audit period usually being 3 years, extending to 6 years for substantial income omission (over 25%) or foreign income issues, and indefinitely for fraud.
Each IRS program has specific and unique eligibility requirements. However, in general, you cannot owe more than $50,000; you must demonstrate to the IRS that you have financial hardship, and paying your full tax debt would create an undue financial burden on you or your family.
Help filing your past due return
For filing help, call 800-829-1040 or 800-829-4059 for TTY/TDD. If you need wage and income information to help prepare a past due return, complete Form 4506-T, Request for Transcript of Tax Return, and check the box on line 8. You can also contact your employer or payer of income.
IRS additional 2-month extension until December 15 for expats | TfE. If you're a green card holder living outside the United States, your tax obligations don&rsquo... Living abroad does not exempt US citizens from IRS reporting obligations involving foreign trusts ...
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.
File Form 4868, Application for Automatic Extension of Time To File U.S. Individual Income Tax Return. You can file by mail, online with an IRS e-filing partner or through a tax professional. Estimate how much tax you owe for the year on the extension form: Subtract the taxes you already paid for the filing year.
You might have to pay IRS penalties and interest if you file your federal income tax return after the April deadline, your due date isn't extended, and you end up with a tax bill. First, the IRS charges a 5% penalty per month on any tax due if your return is filed late. The penalty is capped at 25% of the tax owed.
Getting Help From the IRS
If you can't pay your taxes, the IRS offers payment options — including payment plans and offers in compromise — depending on your situation. A Low Income Taxpayer Clinic (LITC) might be able to help you. LITCs help people of modest means who have a tax dispute with the IRS.
The IRS's $600 reporting law for payment apps (like Venmo, PayPal) was delayed multiple times, originally from the American Rescue Plan, with a phased approach now in place, meaning the original high threshold ($20k/200 transactions) generally applied until recently, but new legislation (like the "One Big Beautiful Bill Act of 2025") aims to repeal or significantly change the rule, reverting it back to the older, higher thresholds (e.g., $20k/200) for future tax years, reducing confusion and burden on taxpayers for personal transactions.
Using a reputable tax preparer – including certified public accountants, enrolled agents or other knowledgeable tax professionals – can also help avoid errors.
Taxpayers usually have three years to file and claim their tax refunds. The three-year deadline for filing 2019 returns to claim a refund was in 2022, but the IRS postponed the deadline to July 17, 2023, due to the COVID-19 pandemic.
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-file penalty is usually five percent of the tax owed for each month, or part of a month that your return is late, up to a maximum of 25%.
In addition to a fine, the ATO can also apply General Interest Charges (GIC), on any amount still owing. Note: The rate for GIC changes quarterly. At the time of writing this article, the rate is 10.61% per annum (October – December 2025).