Sole Proprietorship entities face a distinct set of IRS filings and a corresponding distinct set of penalty exposures. Where individual taxpayers worry primarily about Form 1040 deadlines, Sole Prop owners contend with entity-level returns (Form 1040 Schedule C and Schedule SE), employer filings (Forms 941, 940), and frequently estimated tax obligations on top of the personal return. Each of those filings carries its own penalty structure when filed late, and each can be abated under federal law.
The penalty abatement path for Sole Prop entities is the same federal mechanism available to all taxpayers: Form 843, mailed to the appropriate IRS service center with substantiation of either first-time abatement eligibility or reasonable cause. What differs for Sole Prop owners is which specific penalties most commonly apply and which substantiation arguments tend to succeed.
Common penalties for Sole Prop entities
The penalties our practice most frequently abates for Sole Prop clients are:
- Failure to pay self-employment tax
- Underpayment of estimated tax
- Failure to file
Each of these penalty types is addressable through Form 843. The substantiation differs by penalty type. A failure-to-file penalty on a Form 1065 partnership return, for example, requires reasonable-cause substantiation specific to why the partnership was unable to file on time. A late-deposit penalty on Form 941 employment taxes requires documentation of the deposit failure circumstances. Our practice handles the case-specific substantiation.
For Sole Prop entities, the abatement opportunity often spans multiple penalty types across multiple tax periods. A single Form 843 filing can encompass the entity's late-filed entity return, late-deposited employment taxes, and any individual-level penalties tied to the owner's pass-through reporting — provided each is substantiated separately within the same submission.
The COVID-era window for Sole Prop owners
Sole Prop owners were among the most heavily impacted business categories during the 2019–2022 economic disruption. Pandemic-related operational shutdowns, employee shortages, supply chain failure, and shifting filing deadlines combined to produce widespread late-filing and late-deposit assessments — even for businesses with strong prior compliance histories.
The IRS has acknowledged these circumstances through various administrative waivers and continues to grant reasonable-cause abatement for substantially documented COVID-era hardship. The statutory window for filing Form 843 to recover these penalties remains open — generally three years from the original filing date or two years from payment, whichever is later. For most 2020 and 2021 assessments, the window closes in the next 12–24 months.
How our practice handles Sole Prop cases
Our practice represents Sole Prop clients on a contingency basis: if we do not recover your penalties, you do not pay. The process is straightforward. You sign a Form 8821 authorizing our access to your IRS transcripts. We pull the transcripts, confirm exactly which penalties were assessed across which tax years, identify the appropriate abatement grounds for each, and prepare a single Form 843 covering the case in full.
Most Sole Prop cases resolve within 60–120 days of mailing. The IRS issues the refund directly to your business — typically via direct deposit when account information is on file, or by mailed check otherwise. The refund includes both the abated penalty and any interest the IRS charged on that penalty. There are no follow-up filings required from your side once the abatement is granted.
The starting point is the calculator on this page. Enter your name, business email, and rough estimates of the penalties and interest your Sole Prop paid. We respond with a refund estimate within one business day.