Section 6501 gives the IRS three years from filing to assess tax — but the window stretches to six years for omissions over 25% of gross income or basis overstatements, and never closes at all for unfiled returns, fraud, or undisclosed foreign reporting. A practical guide to ASED, refund claim windows under Section 6511, the 10-year CSED, Form 872 consents, and what records to keep.
Marketplaces like Amazon, Etsy, and Shopify collect sales tax for you, but registration, zero returns, and economic nexus tracking are still your responsibility. A 2026 compliance routine for multi-channel sellers, with state thresholds and the six mistakes that trigger penalties.
How household employers handle the 2026 nanny tax — $3,000 FICA and $1,000 quarterly FUTA thresholds, EIN setup, W-2 reporting, Schedule H filing, state SUI, and the 1099 misclassification trap that triggers back taxes with no statute of limitations.
Section 263A UNICAP forces producers and resellers to attach indirect costs — rent, supervisor wages, depreciation — to inventory rather than expense them. This guide covers the 2026 $32M small-business exemption, the simplified production and resale methods, Form 3115 and the 481(a) adjustment, and the personnel-allocation mistakes that draw IRS attention.
The Section 45B FICA Tip Credit returns 7.65% of employer payroll tax on reported tips above a frozen $5.15/hour floor for restaurants — and after OBBBA's 2025 expansion, salons, spas, and other personal-care employers can claim it on Form 8846 too.
Section 45Q pays $85 per ton for industrial carbon capture and $180 per ton for direct air capture, claimable for twelve years, transferable for cash, and exposed to recapture for up to seventeen years. This guide explains thresholds, disposal pathways, OBBBA changes, and the bookkeeping discipline that protects the credit.
How executors of closely-held business estates use IRC Section 6166 to defer federal estate tax across 14 years at a 2% rate, with the 2026 inflation-adjusted $1.94M base, the 35% eligibility test, election mechanics, and the acceleration events that kill the deferral.
Foreign owners of US single-member LLCs must file Form 5472 by April 15, 2026, even with zero revenue. A capital contribution as small as $1 triggers the requirement, and a missed filing carries a $25,000 minimum penalty plus uncapped $25,000 continuation fees every 30 days after IRS notice.
Key person life insurance pays the company, not the family, when a founder, rainmaker, or specialist dies. IRC Section 101(j) makes the death benefit taxable unless written notice and consent are completed before the policy issues — a step most small businesses skip, turning a $1M tax-free benefit into roughly $600K–$700K after tax.
The 1099-NEC and 1099-MISC reporting threshold rises from $600 to $2,000 for payments made in 2026 under the One Big Beautiful Bill Act. Backup withholding still kicks in at the same threshold, the 1099-K bar resets to $20,000 plus 200 transactions, and most states have not adopted the federal change—so vendor recordkeeping matters more, not less.
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