Back Taxes are unpaid tax liabilities from prior periods that remain outstanding after the original filing or payment deadline. For businesses, they can arise at the federal, state, or local level and may involve income tax, payroll tax, sales and use tax, excise tax, or information return penalties.
Once a liability is overdue, interest generally accrues and penalties may apply until the balance is resolved. At the federal level, section 6651 imposes additions to tax for failure to file and failure to pay, unless the taxpayer shows reasonable cause and not willful neglect.
Specifically, failure to file generally triggers a 5 percent monthly addition, up to 25 percent, and failure to pay generally triggers a 0.5 percent monthly addition, also up to 25 percent. If the IRS prepares a substitute return, the taxpayer should still file its own return because the substitute may omit deductions, credits, and exemptions.
Businesses commonly incur liabilities from late-filed returns, underreported income, worker-classification errors, payroll deposit failures, and missed information returns. Cash-flow problems also lead businesses to prioritize vendors or payroll over tax remittances, especially trust fund taxes. Another recurring issue is multistate expansion without recognizing filing obligations created by physical presence or Economic Nexus, particularly for sales and use tax. Businesses may also discover historical exposure during due diligence, accounting method changes, or after engaging a new tax adviser. Where returns are not filed, the IRS may prepare a substitute return and begin collection activity, including liens or levies. For federal late-filed returns, the minimum addition to tax for certain returns filed more than 60 days late can apply under section 6651(a)(1).
States generally start with the unpaid tax for each period, then add statutory interest and applicable penalties. The exact computation varies by jurisdiction and tax type, but common penalties include late filing, late payment, negligence, and failure to remit collected tax. Some states also impose harsher treatment where tax was collected from customers or withheld from employees and not remitted. Utah’s voluntary disclosure guidance illustrates the typical framework: the taxpayer pays tax for the agreed disclosure period, interest applies on unpaid liabilities, and penalties are generally waived if the taxpayer complies with the agreement terms. By contrast, outside a disclosure program, penalties often apply automatically. At the federal level, the Failure-to-File Penalty and failure-to-pay addition under section 6651 can compound quickly if the business neither files nor pays.
Businesses generally resolve historical liabilities through voluntary disclosure, amended or delinquent filings, installment arrangements, or audit resolution. For state exposures, a Voluntary Disclosure Agreement can be especially valuable because it often limits the lookback period and waives penalties if the taxpayer comes forward before contact by the state. Utah’s program, for example, allows anonymous initial contact, generally limits the disclosure period, and provides penalty relief if the taxpayer timely completes the process.
At the federal level, if the issue is inability to pay rather than non-filing, the IRS allows short-term extensions of 60 to 120 days and longer installment agreements. That is often the practical route for businesses evaluating how to pay back taxes or structure an IRS payment arrangement while preserving operations. If the IRS has already identified the issue, resolution may occur through examination, Appeals, or other administrative processes. In more complex matters, especially multiyear or multijurisdictional disputes, the matter may become one of broader Tax Controversies requiring coordinated factual development and legal analysis.
Prevention depends on timely filing, timely deposits, and early identification of new filing obligations. Businesses should maintain a tax calendar, reconcile books to returns, monitor nexus footprint, and review payroll and information reporting controls. The IRS emphasizes filing all required returns even if full payment is not possible, because non-filing increases penalties and collection risk. Businesses should also periodically review whether they have exposure from prior periods and address it before an agency initiates contact. For companies already behind, prompt back taxes owed can reduce penalties, preserve refund claims, and avoid substitute returns. Strong documentation, periodic internal reviews, and clearly assigned responsibility for tax compliance are the best safeguards against recurring unpaid tax liabilities.
If a business never filed a required return, many states can assess indefinitely until a valid return is filed. A voluntary disclosure program often limits the lookback period, commonly to three or four years, depending on the state and facts.
Sometimes. States may waive penalties through voluntary disclosure, and the IRS may allow installment arrangements or compromise in limited circumstances. Interest often remains due. Whether full liability can be reduced depends on the jurisdiction, collectibility, and procedural posture.
Failing to address unresolved tax liabilities and delaying filing back taxes can lead to notices, substitute returns, liens, levies, enforced collection actions, and increasing penalties and interest. For state taxes, unresolved exposure can also expand through audit. Operationally, the issue can disrupt cash flow, ownership transitions, and management focus.
Yes. Lenders, buyers, and investors routinely diligence tax compliance. Outstanding liabilities, missing returns, or uncertain nexus exposure can reduce value, delay closing, require escrows, or derail financing entirely because unresolved tax risk directly affects cash flow and successor liability analysis.
For more than four decades, Bennett Thrasher has provided businesses and individuals with strategic business guidance and solutions through professional tax, audit, advisory, and business process outsourcing services. Contact DiAndria Green, Partner in Bennett Thrasher’s State and Local Tax (SALT) practice, or call us at 770.396.2200.
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