How do I catch up on unfiled tax returns as a self-employed consultant?

Start with the last six years. Pull your IRS transcripts, rebuild each year from your bank statements, and file oldest to newest, unless a refund is about to expire. File even if you can't pay, because filing stops the biggest penalty. Refunds expire three years after a return's due date. This is a calm, step-by-step plan for independent consultants, fractional executives and coaches who are a few years behind.

Who is this for?

This guide is for the self-employed who have fallen behind on filing: freelancers, 1099 contractors, independent contractors, sole proprietors and single-member LLC owners. We hear the same story from consultants, fractional execs and coaches. Life got busy or hard, an extension turned into another extension, and one missing year became three. If that's you, you are not the only one, and it is fixable. Here is what we believe: nobody should be kept in the dark about their own taxes. You should know where you stand, what it will take to fix and why, before you pay anyone to help.

The tax rules below are the same for everyone. What differs is how messy the records are, which is where most of the work goes.

How far back do I need to file?

Start with the last six years. That is how far back the IRS normally goes, but it is a practice, not a legal limit, and the difference is worth understanding.

• The law: if you never filed a return for a year, there is no time limit on that year. The IRS can assess the tax, with penalties and interest, at any time (IRS: Time IRS can assess tax).
• The practice: the IRS's own manual tells its staff that enforcement for unfiled returns is normally "not to be more than six years" (IRM 4.12.1.3). In November 2026, that means tax years 2020 through 2025.
• The exceptions: the IRS can ask for older years in some cases, for example when there is a long history of not filing or a lot of tax at stake.

So file 2020 through 2025 first. If you have unfiled years older than that, or an IRS notice about one, tell your Tax Pro before you decide to leave it alone.

Refunds work on a shorter clock. To claim a refund of withholding or estimated payments, you must file within three years of the return's due date (IRS: Filing past due tax returns). If you overpaid your estimates in a missing year, that money has a deadline.

What should I do first?

Get the IRS's view of your income before you rebuild anything. Wage and income transcripts show the W-2s and 1099s that clients and banks reported under your Social Security number. Download them through Get Transcript in your IRS online account, or request them with Form 4506-T and the box on line 8 checked (IRS).

Transcripts are the floor, not the whole picture. A client who paid you by check or bank transfer may never have sent a 1099, and you still owe tax on that income. Your bank statements fill the gap.

How do I rebuild books for a year I never tracked?

Work from your bank and card statements, one year at a time:

1. Download every statement for every account that touched the business, business and personal.
2. Mark each deposit as client income, a transfer between your own accounts, or something personal like a refund from a store.
3. Go through the spending and tag business expenses: software, professional fees, travel to clients, equipment, your share of a phone, coworking.
4. Total income and expenses for the year. That net profit is what goes on Schedule C, and it sets your self-employment tax too.

Expect to sort business from personal inside the same statements. 39% of Sumly users (about 4 in 10) signed up without a separate business bank account, so one account doing both jobs is normal. It just takes more time per year.

Don't skip expenses because a year is old. Every legitimate business expense you find lowers the tax and the penalties calculated on it.

Should I file if I can't pay?

Yes. This is the most important rule in this guide. The monthly penalty for not filing is ten times the monthly penalty for not paying.

• Failure to file: 5% of the unpaid tax for each month or part of a month the return is late, up to 25% (IRS). For returns due in 2026 that are more than 60 days late, the minimum is $525 or 100% of the tax owed, whichever is less.
• Failure to pay: 0.5% of the unpaid tax for each month or part of a month, up to 25% (IRS). It keeps running until the tax is paid, even after you file. When both penalties apply in the same month, the two together total 5%, not 5.5%.

Worked example. A fractional exec owes $8,000 on her 2025 return, which was due April 15, 2026. She filed no extension. She files and pays on December 15, 2026, eight months late.

• Failure to pay: 0.5% x 8 months = 4% of $8,000 = $320.
• Failure to file: 4.5% x 5 months, where it caps = 22.5% of $8,000 = $1,800. It is 4.5% and not 5% because the two penalties together total 5% a month.
• Total penalties: $2,120, plus interest on the unpaid tax.

If she had filed on time and only paid late, her penalty would have been the $320 alone. Filing is what stops the larger penalty, even with nothing paid.

If you can't pay in full, the IRS offers an extra 60 to 120 days through the Online Payment Agreement tool or by calling 800-829-1040, with no user fee, and longer installment agreements beyond that (IRS).

What happens if I wait for the IRS to contact me?

The IRS can file a substitute return for you. It is built from the income reported to it and may not include the deductions you are entitled to, so it usually shows more tax than you really owe. Once you receive a CP3219N notice, you have 90 days to file your own return or petition the Tax Court (IRS). Filing first keeps your expenses in the math. Waiting costs you in another way too: self-employment income you never report earns no credit toward Social Security retirement or disability benefits (IRS).

Can the penalties be removed?

Sometimes. First-time penalty abatement (the IRS calls it First Time Abate) can remove failure-to-file and failure-to-pay penalties if you filed the same type of return on time for the prior three years and had no penalties in that period, other than the estimated tax penalty (IRS: First Time Abate). Because it depends on a clean three-year history, it rarely covers a run of missing years. In July 2026 the IRS announced an automatic version, the Automatic Exemption from Penalty, starting with 2025 returns. It also requires three prior years of filing and paying on time, so it is unlikely to help if you have missing years (IRS announcement).

Reasonable cause relief is the other route, for serious circumstances outside your control. Which one fits depends on your years and your story, so talk to your Tax Pro before you request either.

When should I start?

Now, and finish before the next filing season. The usual pattern is one more extension, then another year added to the pile, and a two-year catch-up becomes a three-year one by April 15, 2027. That date also closes the refund window on 2023.

A realistic order:

1. This month: download transcripts and statements for every missing year.
2. December: rebuild and file your first year. Start with the oldest, unless you overpaid in 2023. Then file 2023 first so the refund doesn't expire.
3. Before April 15, 2027: file the rest of the missing years, then file 2026 on time.
4. Going forward: set aside 20% to 30% of every client payment the day it lands, and pay quarterly. The free Sumly Quarterly Tax Calculator shows your next payment in about two minutes.

How Sumly helps you catch up

A Sumly Tax Pro can pull your IRS transcripts, rebuild your books from past bank statements, prepare each missing return and draft a first-time penalty abatement request when you qualify. Tax filing is $499 per Schedule C return and $699 per S-Corp return.

Once you're current, Sumly keeps you there: plans start at Strive ($49/mo) and Thrive ($149/mo), which adds payroll and a dedicated Tax Pro. Most people who call us about missing years are relieved to find it is fixable. They leave with a plan.

FAQ

How many years of back taxes do I have to file?

Usually the last six. That is the IRS's normal enforcement practice, not a legal limit. It can ask for older years, for example when there is a history of not filing or a lot of tax at stake.

Is there a statute of limitations on unfiled tax returns?

No. If you never filed a return for a year, the IRS can assess tax for that year at any time. Once you file, it generally has three years to assess more.

Is there a deadline to get a refund on an old return?

Yes. You must file within three years of the return's original due date. For 2023 returns, that is April 15, 2027.

Will I go to jail for not filing taxes?

The IRS warns that repeated failure to file can lead to additional penalties and/or criminal prosecution. Filing voluntarily, before the IRS contacts you, is the best position to be in.

What if I can't find my 1099s?

Download your wage and income transcripts, which list the forms reported for you, then add income from your bank statements that never came with a form.

Should I file the oldest year first?

Usually, since some figures carry forward from one year to the next. If a recent year has a refund about to expire, like 2023, your Tax Pro may move it up.

Do I also need to catch up on state returns?

Most states with an income tax have their own filing requirement and penalties. Plan to file state and federal returns for the same years together.

Rules and penalties are published by the IRS: Filing past due tax returns, Failure to file penalty and Failure to pay penalty. Tax situations vary, so confirm specifics with your tax professional.

Get current, then stay current

Tell us which years are missing, and a Sumly Tax Pro will map out the order, the documents and what each year should cost before you commit.