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State Corporate Income Tax Apportionment in 2026: How Single Sales Factor and Market-Based Sourcing Reshape SaaS Tax Bills
A guide to state corporate income tax apportionment in 2026 — why 34 of 44 corporate-tax states now use single sales factor, how market-based sourcing rules in California, Kansas, and Arkansas shift SaaS and service company tax bills toward customer location, and five strategies to manage the exposure.
State Apportionment Formulas for Multistate Businesses: Single Sales Factor, Three-Factor, and Market-Based Sourcing Explained
How U.S. states divide multistate corporate income using single sales factor, three-factor, and market-based sourcing rules — including throwback and throwout traps, P.L. 86-272 limits, and the bookkeeping detail required to file accurately.
The $1 Million Single Audit Trap: Uniform Guidance, SEFA, and How Nonprofits and Governments Pass Federal Compliance
OMB raised the single audit threshold to $1 million in federal expenditures starting October 1, 2024. This guide explains the Subpart F audit under 2 CFR 200, SEFA reporting, four-step major program determination, the 40 and 20 percent coverage rules, and the nine-month Federal Audit Clearinghouse submission deadline for nonprofits and state and local governments.
Single Audit Compliance Under 2 CFR Part 200: Why $1 Million in Federal Funds Triggers a SEFA Audit
A practical walkthrough of the Single Audit Act, the new $1 million federal expenditure threshold effective for fiscal years beginning on or after October 1, 2024, the SEFA's role, the four-step risk-based major program selection, the 12 compliance areas auditors test, and the steps nonprofits and local governments should take before crossing the threshold.
Self-Employed Health Insurance Deduction Under Section 162(l): The Above-the-Line Write-Off That Beats Itemizing for Sole Proprietors and S-Corp Owners
Section 162(l) lets sole proprietors, partners, and more-than-2% S-corp shareholders deduct 100% of medical, dental, vision, and long-term care premiums above the line on Schedule 1, Line 17—if they clear the earned-income cap, the spouse-employer rule, and the W-2 reporting choreography on Form 7206.
Section 83(i) Explained: A Five-Year Tax Deferral for Private-Company RSUs and NSOs
Section 83(i) lets qualified rank-and-file employees at eligible private companies defer federal income tax on RSU vests and NSO exercises for up to five years, but FICA is still due at vesting, the 30-day election window is unforgiving, and the 80 percent broad-based grant rule keeps most startups from offering it.
Section 754 Election and 743(b) Basis Adjustments: How Partnerships Step Up Inside Basis When a Partner Buys In or Dies
A Section 754 election triggers a 743(b) inside-basis step-up when a partner dies, sells, or is bought in — preventing heirs and incoming partners from paying tax twice on the same appreciation. This guide covers 743(b) and 734(b) mechanics, Section 755 allocation across asset classes, the substantial built-in loss rule, Form 15254 revocation, and when the administrative cost outweighs the benefit.
Section 645 Election: One Form 1041 for a Revocable Trust and Estate
A practical walkthrough of the Section 645 election on Form 8855 — how executors and trustees combine a qualified revocable trust with the estate to file one Form 1041, pick a fiscal year, skip two years of estimated tax payments, and claim the Section 642(c)(2) charitable set-aside deduction.
Section 4942 Private Foundation 5% Payout Rule: How Form 990-PF Trustees Calculate Minimum Investment Return, Qualifying Distributions, and Avoid the 30% Initial Excise Tax
Private foundations must distribute 5% of average non-charitable-use assets each year as qualifying distributions or face a 30% initial excise tax under IRC Section 4942. A trustee's working guide to Form 990-PF Part XII, set-asides, five-year carryovers, and the 100% additional tax.
Section 469 Passive Activity Grouping: How Real Estate Investors Unlock Suspended Losses
How real estate investors and multi-entity owners use the Section 469 grouping election under Reg 1.469-4 to aggregate hours across properties and release suspended losses — covering the appropriate economic unit test, the Reg 1.469-9(g) real estate professional aggregation, Rev. Proc. 2010-13 disclosure rules, and why the election is easier to file than to undo.
Section 415(c) Annual Additions Limit for 2026: The $72,000 Cap Explained
Section 415(c) caps total 2026 annual additions to a defined contribution plan at $72,000 — covering employee deferrals, employer matches, and after-tax contributions. The math behind the mega backdoor Roth, the catch-up rules that sit outside the cap, and the EPCRS correction order if the limit is blown.
Section 368 Tax-Free Reorganizations: How Type A Mergers, Type B Stock Swaps, and Type C Asset Deals Defer Tax in Strategic M&A
Section 368 defines seven reorganization types (A through G) that defer corporate and shareholder tax in M&A. This guide covers the 40% Continuity of Interest test, Type A statutory mergers, Type B stock-for-stock swaps with the 80% control requirement, Type C asset deals, and forward/reverse triangular merger structures with their consideration limits.