How the IRS Section 183 nine-factor test decides whether your side activity's losses are deductible in 2026, what the three-of-five safe harbor really means, and what 2025's Young v. Commissioner reveals about the records that win in Tax Court.
A working IRS-compliant accountable plan lets S-Corp owners reimburse home office, 72.5¢/mile mileage, internet, and travel tax-free—turning otherwise-lost expenses into deductible corporate spending. This guide covers the three §1.62-2 requirements, a worked $3,126 home office calculation, the five mistakes that get plans reclassified as wages, and the monthly bookkeeping rhythm that keeps it audit-proof.
The OBBBA's 0.5% AGI floor and 35% deduction cap take effect in the 2026 tax year, raising the cost of small annual gifts. Concentrating four years of donations into a single donor-advised fund contribution can add roughly $39,600 in total deductions for a $200,000-AGI couple while keeping the recipient charities on their normal schedule.
The One Big Beautiful Bill Act's Section 174A restores immediate domestic R&D expensing starting in 2025, and small businesses under roughly $31 million in average gross receipts have until July 6, 2026 to amend 2022, 2023, and 2024 returns to recover taxes paid under the TCJA capitalization rules.
A 2026 decision guide for small businesses choosing between Section 179's $2.56M cap and OBBBA's permanent 100% bonus depreciation, with order-of-operations rules, hybrid examples, and state-conformity caveats.
Section 280A(g) — the Augusta Rule — lets business owners rent their personal residence to an S-corp, C-corp, or partnership for fewer than 15 days a year and exclude the entire rent from federal income tax. In Sinopoli v. Commissioner (2023), the IRS slashed roughly $290,000 of claimed rent down to $30,000 because documentation and fair-market rates were thin. Here is what 280A(g) actually requires, the five pillars of an audit-proof setup, and how to report the rent without triggering an IRS mismatch.
How the 2026 Health Savings Account combines tax-free contributions, tax-free growth, and tax-free medical withdrawals — and how the shoebox strategy turns an $8,750 family limit into a six- to seven-figure retirement vehicle by age 65.
Section 183 of the Internal Revenue Code denies loss deductions for activities not engaged in for profit. The IRS applies a nine-factor test and a three-of-five-years safe harbor (two of seven for horses) to distinguish a real business from a hobby — here is what each factor weighs and how to document profit motive before an audit.
U.S. cash balance pension plans let solo doctors, attorneys, and consultants deduct $100,000–$370,000 a year on top of a Solo 401(k). 2026 contribution limits, a worked example for a 54-year-old physician, and the actuarial commitments to weigh before signing.
The de minimis safe harbor election under Treasury Regulation 1.263(a)-1(f) lets businesses without audited financials immediately expense tangible property purchases up to $2,500 per item, skipping depreciation schedules and capitalization analysis.
Take control of your finances with our open-source double-entry accounting system. Start your ledger today.
© 2019 - 2026 Beancount.io
