Worried that catching up on your back taxes will put you on the IRS's radar and make you more likely to face an audit? Well, that's a common fear, but fortunately, it's unfounded. The IRS does not audit late-filed returns at higher rates than returns filed on time.
Once you file a return, there's always a risk of a tax audit – the IRS has the right to audit any return you file with the agency, but in most cases, that risk is small, and being late doesn't increase your chances of being selected.
In fact, having unfiled returns typically puts you at greater risk than filing your back taxes late. This post explains why – ready to just catch up now? Then, use TaxCure to find a tax pro who can help you deal with your unfiled tax returns.
Key takeaways:
- Filing late does not increase your risk of an audit.
- The IRS audits most returns within one or two years after they're filed.
- Not filing puts you at risk of incorrect tax assessments, penalties, and involuntary collections.
Does Filing Late Make the IRS Suspicious of Your Return?
Generally, no. The IRS doesn't look at late returns with any more scrutiny than timely-filed returns. Late returns go through the same processing as returns filed on time, and if any issues come up during review, then the IRS may audit the return.
Common triggers that lead to IRS audits include:
- Discrepancies between info reported on the return and details reported by third parties – for example, the IRS checks the wage info you report against the info your employer reports on your W-2.
- Connections with other returns that have failed audits – For example, if the IRS audits a partnership return and finds issues, they may audit the partners' individual returns.
- Random selection – Whether you file late or on time, the IRS may randomly select your return for an audit.
However, in all cases, audit rates are relatively low – the IRS audits less than 1% of most returns. And if you file an accurate return and keep your records, you shouldn't have to worry about "failing" the audit and incurring penalties.
To learn more about audit red flags and how to avoid them on your return, check out this post on how to avoid an audit.
What if you're consistently late?
Filing individual and even business returns late on a regular basis doesn't usually lead to any more problems than financial penalties. However, if you consistently file payroll taxes or make payroll tax deposits late, the IRS's system will generate an FTD alert, and they may send a revenue officer to your business.
How long does the IRS take to audit a return?
According to the IRS's website, "The IRS tries to audit tax returns as soon as possible after they are filed." Most returns are audited within 12 to 18 months of filing, but the IRS has up to three years to select a return for audit.
However, if the agency finds substantial errors in your return, they can go back up to six years. If fraud is involved, they may be able to go back even further.
Filing Late Vs. Not Filing at All? What's the Better Option?
When you're behind on your taxes, you have two options: file late or don't file at all. Generally, filing late is the better and safer option – here's why:
- The lookback period – Once you file a return, the IRS only has up to three years to audit it. But if you don't file, the IRS can go back an unlimited time to assess tax against you.
- Incorrect IRS tax calculations – If you file a late return, you get to put in all the correct details. You get to optimize the situation to reduce your tax liability as much as legally possible. However, if you file late, the IRS may issue a substitute for return to estimate how much you owe, and that, typically, leads to an unnecessarily high tax burden.
- Maxed out penalties – If you owe tax, the IRS will assess penalties on your late-filed return. Late filing and payment penalties can get up to 50% of your balance, but it takes a few years for the penalties to max out this high. If you file sooner rather than later, you will still incur penalties, but you may be able to avoid maxing out the penalties.
- Loss of refund – If you're due a refund, you only have three years to claim it. To ensure you get the money, you should get on top of these old returns as quickly as possible. You can use the refunds to offset the amount you owe for other years.
- Legal risks – If the IRS believes that you have not been filing returns in an attempt to evade taxes, they may recommend a criminal investigation. This is rare, as the IRS doesn't treat most unfiled returns as tax crimes, but it's a possibility.
To put it simply, filing (even if it's late) gives you control over what's reported. If the IRS takes matters into its own hands, you may face a higher tax assessment and potentially even legal risks.
Filing Late Doesn't Hide Much From the IRS
Sometimes, people are afraid to file on time because they don't want to alert the IRS that they owe taxes. But in most cases, the IRS already knows. Even if you don't file a return, the agency has these details about you:
- Wages – your employer sends a W-2 to the IRS every year.
- Freelance income – If a client pays you over $600 (over $2000 as of 2026), they send a 1099-NEC to the IRS.
- Investment income – Investment houses send 1099-B forms to the IRS, while banks send 1099-INTs, and the 1099-R records payments from retirement accounts.
- Payment processing records – If you use Square, Clover, PayPal, or any other service to accept credit cards and process payments, they may send a 1099-K to the IRS.
- Real estate sales – If you sold property during the year, the closing company most likely generated a 1099-S to send to the IRS.
- Other payments – Other payors may send 1099-MISCs or other forms to the IRS.
The IRS has all of this information. They already know that you probably owe tax – they're just waiting for you to file a return. Often, the agency waits years to follow up with non-filers. For example, in 2024, the agency started reaching out to high-income non-filers who hadn't filed since 2017.
The longer you wait to file, the more likely you are to face consequences such as the IRS filing a substitute return on your behalf.
When the IRS Files for You: Substitute for Return (SFR)
Eventually, if you don't file, the IRS may issue a substitute for return. Also called an SFR, this is a tax return that the IRS generates on your behalf, using details submitted by third parties. SFRs use the standard deduction and the filing status of single or married filing separately, which tends to lead to inflated tax assessments.
If the IRS generates an SFR, it will send you a notice of deficiency. That gives you 90 days to protest the assessment or file a correct return – you get 150 days if the letter is sent to you while you're out of the country.
The tax due becomes final if you don't protest during that period. At that point, you may still have appeal rights, but you may have to pay the tax and request a refund before you can appeal. That's why it's critical to respond as soon as you receive the notice of deficiency, if not sooner.
Benefits of Filing Now – Even If You're Late
If you're already behind, it can feel scary to catch up, but filing your late returns gives you the following benefits:
- Claim tax refunds – You only have three years to claim refunds.
- Start the audit clock – Once you file, the IRS only has three years to audit, but if you don't file, they can look at that year at any point.
- Avoid an SFR – By filing, you avoid the risk of an SFR.
- Stop late filing penalties – Late filing penalties accrue monthly until you file, and once you file, they stop.
- Determine your tax liability – If you don't file, you probably don't know how much you owe, and living in limbo can feel stressful.
- Set up payments or settlements with the IRS – Once all your unfiled returns are in, you can start to look into payment options or settlements.
Filing your returns also shows that you're trying to get back into compliance. The IRS is much more willing to work with people who aren't trying to hide anything.
Take Action – Don't Let Audit Fears Hold You Back
Don't let an inflated fear of an audit hold you back from filing your returns. Filing late doesn't trigger audits, and if you're one of the unlucky very small percentage of filers who are selected for an audit, you should be able to back up the details reported on your return as long as it was filed accurately.
To get help now, use TaxCure to find a tax pro to help you today. Start your search now – then use the filters to narrow down the results to find someone experienced with back taxes and your state if you're also behind on state returns. If you've been selected for an audit already, you can look for an audit attorney or tax pro to provide representation through the audit process.
Frequently Asked Questions (FAQ) on Filing Old Returns and Triggering Audits
Check out these FAQs for more details or contact a tax pro today.
Will filing old tax returns trigger an audit?
No. The IRS reviews returns filed on time and late in the same way. However, consistently filing business (payroll, in particular) returns late can lead to a heightened audit risk.
Can I still get a refund if I file late?
Yes, you have up to three years from the original due date to file a return for a refund.
What if I don’t have all my tax documents?
A tax professional can help you find old wage and payment documents. They can also help reconstruct old bookkeeping records for your business.
Should I wait until I can pay before filing?
No, waiting will only add more penalties and interest to your account. Even if you can't pay, you should file so that you can find out how much you owe. Then, you can contact the IRS to talk about payment or relief options. In most cases, you cannot set up payments for the current year unless you have filed the previous five years.
What happens if I never file past returns?
You put yourself at risk of the IRS generating substitute for returns, adding penalties, and starting involuntary collections. Also, you will struggle to prove your income to lenders and may not be able to get certain types of loans.
How long does the IRS have to audit a late return?
The IRS has three years from the later of the filing deadline and the date you file to audit a return. So, if you file late, the agency has three years from the date you filed.
What is a Substitute for Return (SFR)?
A substitute for return is what the IRS uses to determine your tax liability if you don't file your returns. It uses info reported by other payers, but it doesn't give you any credits or anything besides the standard deduction for single or married filing separately.
Does amending my return increase my audit risk?
No, amending a return does not increase your audit risk. The IRS is no more likely to audit an amended return than an originally filed return. However, if your return shows audit triggers, the agency may select it for an audit – that typically happens soon after you file, especially if the audit statute of limitations is about to expire on the original return.
Do I need a tax attorney to handle back taxes?
Yes, in most cases, an attorney can be invaluable if you're dealing with multiple years of unfiled returns. The more complicated your situation is, the more essential their services are.