Unfiled 1099 Income: Schedule C Expenses for Back Years

I didn't file for years: am I taxed on my full 1099 income?

You are taxed on the full 1099 amount only if the return that stands for that year leaves out your expenses. A Form 1099 shows what a payer paid you before any of your costs, and a Form 1099-K amount is stated without regard to fees, refunds or shipping. If you do not file, the IRS may file a substitute return (an SFR, prepared from the income forms it received), and it might not give credit for deductions you could claim. Your own return puts your receipts on Schedule C line 1 and subtracts the expenses you can support, so tax is figured on net profit.

Report all business receipts, including payments no form reported: no matter the amount reported, income from selling goods or services must be reported. A 1099 total is a figure to reconcile with your own records, not your profit.

A case is not simple when several years are open, the IRS has proposed or assessed tax on the gross, or records are thin. Each turns on proof, one year at a time, and those are the cases where professional help matters: which expenses each year's records support, how the proof is built, and the order the years are filed. See individual tax help, or catch-up bookkeeping if the records must be rebuilt first. Gather:

• Wage and income transcripts for each year: the IRS's copy of every 1099 and W-2 reported under your number.
• Statements for every bank account and card that paid a business cost, personal ones included.
• Invoices, order histories and billing records from vendors.
• Calendar entries, emails and trip histories that show where you drove and why, with vehicle service records.
• Rent or mortgage, utility and insurance records for any year you worked from home.

For which years are due, penalties and getting 1099 copies, see catching up on unfiled returns.

Which business expenses can I claim on Schedule C for a back year?

A cost that is ordinary and necessary for the business and, under the cash method that many sole proprietors without inventory use (income counted when received, costs when paid), paid in that year. An ordinary expense is common and accepted in your field; a necessary one is helpful and appropriate. A partly personal cost counts only for its business part. Personal, living and family expenses, fines paid to a government agency, and entertainment are usually not deductible (Publication 334).

Equipment bought in a back year: the de minimis safe harbor, which lets you deduct small purchases at once, is elected on a timely filed original return, so a return filed years late may not qualify, while a section 179 election can be made on an original return whether or not it is filed on time, and bonus depreciation applies unless a timely return elected out. See small purchases, including what to do if the election was missed.

Goods you resell are cost of goods sold, not an expense line: see inventory without records. Drivers have their own list in rideshare and delivery driver deductions.

Do I need historical bookkeeping, or can I rebuild expenses from bank statements?

You need a summary of income and expenses for each back year, with the records behind it, and you can build it now from bank statements and vendor records. Publication 583 says your books must show gross income, deductions and credits, and you must keep supporting documents. Start with the money that left your accounts, then attach a record of what it bought.

1. Download statements for each year from every account or card that paid a business cost.
2. List payments to business payees, tag each with a Schedule C category, and pair it with a record of the purchase: vendor account history, billing emails, invoices, fee reports.
3. Split mixed-use costs at a business share you can explain, and remove double counts. A card payment from the bank and the charges on the card statement are the same money once.
4. Total each category by year and write a short note on how you built it.

Without a canceled check, a legible account statement can show payment if it has the amount, payee and date (and the check number for a check), but proof of payment alone does not establish a deduction: keep an invoice or sales slip showing you incurred the cost. For the full ledger method, see rebuilding books from bank statements.

What proof does the IRS accept when receipts are gone?

Statements, vendor records and invoices that show the amount, date, payee and business purpose. Publication 583 says supporting documents should show the amount paid and that it was for a business expense, and lists canceled checks, account statements, card slips and invoices.

A record made at the time carries more weight than a statement prepared later. Label anything you build now with today's date and its sources, and never backdate. For travel, gift and car costs, you cannot deduct amounts you approximate or estimate.

For other expenses, the IRS publications cited on this page set no estimating rule. A figure with no document behind it is the one most likely to be disallowed, and an unsupported deduction can lead to a 20% accuracy-related penalty when the underpayment comes from negligence or a substantial understatement (IRS). See lost receipts for business expenses and expenses the IRS questions.

What about car and truck costs: which mileage rate applies to each back year?

Use the standard mileage rate in effect when the miles were driven. For 2022, split the miles by half year.

Rates are from the IRS table, which also lists earlier years. Multiply business miles by that year's rate and add parking and tolls on line 9 (Schedule C instructions). The other choice is actual expenses: the business share of fuel, repairs and insurance, plus depreciation. Using the standard rate for a year rules out deducting actual costs for it.

Three traps. First, an owned car can use the standard rate only if it was chosen in the first year the car was available for the business, by the return's due date including extensions. The IRS pages do not say how that works when the first business year was never filed, so settle it before choosing. Second, a leased car must use the standard rate for the entire lease period, renewals included, so it cannot be picked year by year. Third, driving between home and a regular workplace is commuting, which is not deductible.

For each business use, the record needs the date, destination, purpose and miles, plus total miles for the year (Publication 463, Table 5-1). The return also asks when the vehicle was placed in service, its business, commuting and other miles, and whether you have written evidence (Schedule C, Part IV, or Form 4562 if you file it). Rebuild from calendars, invoices, trip histories and service records: see rebuilding a mileage log.

Can I claim a home office for years I did not file?

Yes, if part of your home met the tests that year. The simplified method needs a timely filed original return, so for a back year plan on Form 8829.

The space must be used exclusively and regularly as your principal place of business, or as a place where you meet clients in the normal course of business; Publication 587 lists other routes too. A room the family also uses generally fails the exclusive-use test. The deduction is limited to the business income from that use after unrelated business costs, so it cannot create a loss.

The simplified method is elected by using it on a timely filed, original return, and a return filed after its due date (extensions included) is not timely filed. For a back year, work out Form 8829 from that year's housing costs; whether any late-election relief exists needs a preparer's review before filing. If you own the home, depreciation allowed or allowable on the office part cannot be excluded from gain when the home is sold. For the full tests, see home office: simplified or actual.

Which year's forms do I use, and do I file each year separately?

Yes, each tax year is a separate return on that year's forms. Use that year's Form 1040, Schedule C and Schedule SE, with that year's instructions, from the prior-year forms page. Each business gets its own Schedule C for the year (Schedule C instructions).

Send a return to the address on any IRS notice; otherwise file it the same way and to the same place as an on-time return. IRS e-file accepts the three most recent tax years the IRS has opened, a window that moves each January; the IRS tells notice recipients that older returns go in by mail. A year named in a notice has its own response date, so read the notice before anything else. State returns follow separate rules; see the catching-up guide.

How do net profit and self-employment tax change once expenses are counted?

Income tax and self-employment tax are both figured from net profit, so supported expenses can lower both. How much depends on the rest of the return (other income and credits) and, for self-employment tax, the year's Social Security wage base. Schedule C line 31 flows to Schedule 1 for income tax and to Schedule SE line 2.

Self-employment tax is 15.3% (12.4% Social Security plus 2.9% Medicare) of net profit multiplied by 92.35%, with half deductible; the Social Security part stops at a yearly wage base (Schedule SE). It applies once net earnings from self-employment reach $400. Late-filing and late-payment penalties are figured on the unpaid tax, so a lower tax generally means lower penalties, though a late-filing minimum can apply; the rates, the minimum and relief are in catching up on unfiled returns.

One trade-off: the Social Security Administration uses Schedule SE to figure benefits. It credits self-employment income reported on a return filed within 3 years, 3 months, and 15 days after the tax year, so for a year still inside that limit, claiming expenses lowers the earnings recorded as well as the tax. After the limit, the SSA may change its record only to remove or reduce earnings, not to increase them.

How long do I have to claim a refund for an old year?

To get back withholding, estimated payments or credits such as the earned income credit, file within 3 years after the April 15 following the tax year (IRS). Those payments count as made on the due date, so a return filed later generally gets none of them back, unless a filing extension or an exception, such as a disaster or combat-zone service, adds time (IRS). For tax paid some other way, the claim is due by the later of 3 years from filing or 2 years from payment, and the refund is limited to tax paid in the three years before filing, plus any extension period (IRS). Lower net profit can change credits that depend on income.

Expenses are not subject to a deadline of their own: they are part of the return for that year. If the return shows an overpayment, the refund limits above apply. If tax was already assessed, the IRS treats your return as a reconsideration (next section). For a year you never filed, the IRS can assess tax at any time; filing the return starts the assessment period, usually three years.

What if the IRS already filed for me, or the balance looks huge?

A return you file yourself can use the figures you can support; expect questions where support is thin.

• A notice of deficiency (CP3219N): you have 90 days (150 days if outside the US) to petition the Tax Court. Filing a return does not extend that deadline. To disagree without petitioning, file the return by the notice date.
• Tax already assessed on a substitute return: the IRS handles a later original return as a reconsideration. If it questions the expenses, it can examine them and use statutory notice procedures to disallow what is unsupported. It rejects an unsigned return as invalid, so sign each one.
• A 1099 that does not match your deposits: compare the two. If your 1099-NEC total is more than the receipts you report, attach a statement explaining the difference. Ask the payer to correct a wrong form. For an IRS mismatch notice, see responding to a CP2000.
• A large balance: the IRS says to file every return that is due whether or not you can pay in full, and it generally adjusts your account to the correct figures once your own return is processed. For payment options, see catching up on unfiled returns. Estimated payments going forward are in quarterly estimated tax.

Example

These examples are illustrative, in US dollars. Income and self-employment tax are simplified.

Delivery driver, three years

A driver receives US$40,000 of 1099 income each year for three unfiled years. Statements and a trip history support 10,000 business miles a year plus US$7,500 of phone, supplies and fees. Assume the standard rate is available for the car (see the traps above) and the driver has no wages, which would use up part of the Social Security wage base.

For 2023, self-employment tax falls from about US$5,650 on US$40,000 to about US$3,670 on US$25,950, before income tax. Each year is filed on its own forms.

Freelance writer with no receipts

A writer has US$65,000 of 1099-NEC income and a spare room used regularly and only for work, where she does her billing and most of her writing. Bank lines show US$9,000 of software, co-working and the business share of internet, each matched to a vendor billing record. Net profit before the home office is US$56,000. Because the year is filed late, the simplified method is not available, so she gathers that year's rent and utilities for Form 8829.

Consultant whose gross was assessed

The IRS filed a substitute return on US$90,000. The consultant files her own signed return showing US$30,000 of supported expenses and a net of US$60,000. The IRS handles it as a reconsideration. If it questions the US$30,000, it may examine the return and ask for proof.

Different for you?

• Several years are open, or you have no receipts and no books: the order of the years and the proof for each need professional judgment. Get individual tax help, and see catch-up bookkeeping if the records must be rebuilt first.
• The IRS has filed a substitute return or sent a notice: the notice date controls. Read catching up on unfiled returns and bring the notice to individual tax help.
• You resold goods: cost of goods sold follows its own rules in inventory without records.
• You drive for a platform: see rideshare and delivery driver deductions.
• The IRS sent a mismatch notice (CP2000): see responding to a CP2000.
• A multi-member LLC, partnership or corporation also missed returns: see unfiled business returns. A one-owner LLC that has not elected corporate tax treatment reports on the owner's Schedule C.
• You were not a US resident for some of those years, or held accounts abroad: the form and the extra reports change; see nonresident return for business income and missed foreign reporting.
• You lived in Canada during the missing years: see missed US returns from Canada.