What IRS Form 1120-S (2020) Is For
IRS Form 1120-S (2020) is the U.S. Income Tax Return for an S Corporation. It is used to report the corporation’s income, deductions, credits, capital gains, and other income for federal tax purposes. An S corporation passes its corporate income, profits, and losses directly to shareholders, who then report them on their personal tax returns. This process helps determine how much each shareholder owes in federal taxes or whether they qualify for refunds. Filing this income tax return ensures that all payments, credits, and deductions are properly recorded for the tax year. If your business has older tax years that were never submitted, reviewing any unfiled 1120-S S corporation returns can help prevent IRS penalties and enforcement activity.
When You’d Use Form 1120-S for 2020 (Late or Amended Filing)
You must file IRS Form 1120-S (2020) if your business operated as an S corporation during the 2020 tax year and had reportable income or losses. You may need to file late or amended returns if you missed the original due date of March 15, 2021, or if the IRS sent a notice such as CP259 saying it has no record of the corporation's return. An amended tax return may also be required when you discover errors, missed deductions, or changes affecting shareholder accounts.
A refund claim must generally be filed within 3 years after the return was filed or within 2 years after the tax was paid, whichever is later. Filing late carries a penalty of $210 per shareholder for each month or part of a month (up to 12 months) the return is late. Paying early reduces the total pay penalty and interest owed on unpaid tax. Filing accurately ensures compliance with IRS filing requirements.
If you are unsure which corrections, schedules, or supporting documents apply for a late or amended filing, the IRS Form Help Center offers guidance for past-year S corporation returns.
Key Rules Specific to 2020
- COVID-Related Credits: The 2020 tax year included refundable credits for paid sick leave and family leave wages under the Families First Coronavirus Response Act, as well as the Employee Retention Credit. These credits help offset a business’s tax bill and are claimed on the employer's Form 941, not on Form 1120-S.
- New Schedule K-1 Items: The 2020 Schedule K-1 (Form 1120-S) added new items: Item G records shareholder stock ownership numbers, and Item H tracks loans from shareholders. These details help the IRS determine the corporation’s income distribution and maintain accurate documentation for each account.
- Penalty Rules: The IRS imposes penalties for failing to file taxes on time or for failing to pay taxes by the due date. The late payment penalty adds 0.5% of the unpaid tax for each month or part of a month until paid, up to 25%; for a 2020 return, it has generally already reached that maximum.
Businesses dealing with pandemic-year credits, penalties, or reporting requirements may benefit from exploring business tax relief programs that help with federal compliance and back taxes.
Step-by-Step (High Level)
- Gather Records: Collect all financial statements, documents, and prior-year returns. Include gross income, other income, and capital gains.
- Complete the Form: Use the official 2020 Form 1120-S and all schedules. Enter details about income, deductions, credits, and the corporation’s income to calculate profits or losses.
- Prepare K-1s: Issue accurate K-1 statements to shareholders. Each K-1 shows income, gains, losses, and credits that should be included on personal tax returns.
- Attach Schedules: Include schedules for capital gains, rent, and other transactions of the entity. Attach all required statements showing payments, deductions, and credits.
- Choose Filing Method: A 2020 Form 1120-S can no longer be e-filed (IRS e-file accepts only the current and two prior tax years, and tax year 2022 and earlier returns must be filed on paper after Dec 31, 2025), so mail it to the address in the current Instructions for Form 1120-S.
- Retain Copies: Keep complete copies of your return, proof of payment, and related documents for at least three years after the date filed.
If your corporation owes taxes or accumulated penalties after preparing Form 1120-S, you may apply for an IRS payment plan to break the balance into manageable installments.
Common Mistakes and How to Avoid Them
- Incorrect Ownership Percentages: Confirm shareholder ownership details before filing to ensure profits and losses are distributed accurately.
- Unpaid Tax Issues: Pay shareholder-officers reasonable compensation for their services to prevent IRS penalties and additional taxes.
- Incomplete Returns: Review all schedules, income categories, and credits to make sure every required form is complete before submission.
- Late K-1 Delivery: Provide all shareholder Schedule K-1s before the filing deadline to avoid late penalties.
- Ignoring Basis Rules: Maintain accurate records of each shareholder’s basis to ensure proper calculation of deductions, losses, and refunds.
- Missing Extension Requests: File Form 7004 promptly to secure a six-month extension and prevent late-filing penalties, keeping in mind that taxes still must be paid on time.
What Happens After You File
Processing times for late Form 1120-S returns vary. Respond promptly to any IRS notice asking for more information. If you owe tax, the IRS sends notices showing your balance, penalties, and interest. Payments can be made electronically or by mail. If the corporation can't pay in full, call the number on the IRS notice (or 800-829-4933) to request a payment plan.
If the return is late, penalties will accumulate: $210 per shareholder per month (up to 12 months) and, if tax is due, 5% of the unpaid tax per month, up to 25%. The per-shareholder late-filing penalty applies even if the S corporation owes no income tax. Reasonable cause, such as illness or disaster, may qualify for penalty abatement.
Always review the IRS page's last reviewed or updated date to confirm current requirements. Filing requirements and mailing addresses are subject to change, so please check the IRS website for updates. If penalties are assessed for late filing, missing K-1s, or unpaid taxes, your business may request IRS penalty abatement by providing a reasonable cause explanation.
FAQs
Can I still file an IRS Form 1120-S (2020) tax return late and qualify for a refund?
You can still file, but a refund is unlikely. A claim on a late original return is limited to tax paid in the 3 years (plus any filing extension) before you file, so tax paid by the 2021 due date generally can't be refunded. Filing ensures compliance; for a 2020 return, the $210-per-shareholder late filing penalty has already reached its 12-month maximum. Refunds depend on whether the required tax has been fully paid and the return is completed correctly.
What is the due date and penalty for filing a 2020 S corporation income tax return?
The due date was March 15, 2021. The IRS assesses a penalty of $210 per shareholder per month for failure to file taxes for up to 12 months. If taxes remain unpaid, a late payment penalty of 0.5% per month, up to 25%, applies. Paying promptly helps avoid balance growth and additional interest.
How can I obtain Form 1120-S transcripts or account statements before filing my taxes?
You can request transcripts online through IRS.gov, by calling the IRS, or by mailing Form 4506-T. These statements show payments, credits, deductions, and prior filing data. Checking your account helps verify that all information is accurate before submitting your income tax return.
Do I need to include capital gains and other income when completing Form 1120-S?
Yes, you must report all capital gains, gross income, rent, and other income to determine the tax required. Failure to report income may result in penalties or delays in processing. Each shareholder’s portion should appear on their K-1 and personal tax returns.
What are the filing requirements if my S corporation cannot pay in full by the deadline?
Filing requirements state that every corporation must file on time or request an extension. If your corporation cannot pay in full, you can request an installment agreement or submit partial payments. Reasonable cause explanations may help reduce penalties if failure to pay was due to circumstances beyond the corporation's control.
