#tax-deadlines
Important tax filing deadlines and compliance dates to remember
South African freelancers pay provisional tax in two IRP6 installments — 31 August and 28/29 February — by estimating full-year taxable income themselves; missing a deadline or estimating below 90% of actual income triggers a 10% late-payment penalty, a 20% underestimation penalty, and interest from the effective date.
The IRS requires S-corp and C-corp Designated Officials to revalidate Business Tax Account access every June 15 through July 29 or lose online access to payments, transcripts, and notices until they reapply from scratch.
IRS Publication 15 (Circular E) sets the rules small employers must follow on every paycheck — federal income tax withholding via the wage-bracket or percentage method, 6.2% Social Security to the annual wage base, 1.45% Medicare plus 0.9% above $200,000, EFTPS deposits on a monthly or semiweekly schedule set by the $50,000 lookback test, and Forms 941, 940, W-2 and W-3. This guide translates each rule into what to do, when it is due, and which ledger account to book it in — including the failure-to-deposit penalty ladder of 2%, 5%, 10% and 15%.
Wind and solar had to begin construction by July 4, 2026 — but a facility placed in service by December 31, 2027 still qualifies for 45Y/48E, a vacated IRS notice restored the 5% safe harbor, and storage, geothermal, and fuel cells remain eligible through 2033.
Only about 437,000 of the 864,000 UK sole traders and landlords in scope filed their first Making Tax Digital quarterly update by 7 August 2026 — close to half missed it. No penalty points apply this tax year, but HMRC begins forced enrolment in September 2026 and the next quarterly update is due 7 November 2026.
A small business owner's guide to filing Form 843 for COVID-era penalty refunds under the Kwong ruling, with step-by-step instructions and eligibility criteria before the July 10, 2026 deadline.
Bill C-15 makes bare trust reporting mandatory in Canada for tax years ending on or after December 31, 2026, with T3 and Schedule 15 filings due March 31, 2027. Covers which small-business arrangements count as bare trusts, the narrow $50,000/three-month exemption, and penalties up to 5% of trust property value.
Form T2125 turns a Canadian sole proprietor's invoices and receipts into taxable net business income on the T1 return. For 2026, gig platforms report earnings directly to the CRA, self-employed CPP totals nearly $9,300 at the earnings ceiling, and the June 15 filing extension still leaves payment due April 30.
Irish sole traders filing Form 11 in 2026 face a mid-year PRSI Class S rise from 4.2% to 4.35% on October 1, a €650 minimum PRSI charge, and the preliminary tax rule requiring 100% of prior-year or 90% of current-year liability by October 31 — with a ROS extension to mid-November for those who file and pay online.
Businesses that missed the July 4, 2026 begin-construction deadline can still claim the 30% Section 48E solar credit — but only if the system is placed in service by December 31, 2027, with no partial credit after. Covers the under-1 MW prevailing-wage exemption, domestic content and energy community adders, MACRS plus 100% bonus depreciation, selling the credit under Section 6418, and the 10-year FEOC clawback risk.
After Tropical Storm Arthur struck Louisiana on June 17, 2026, the IRS postponed federal tax deadlines to November 2, 2026 for Avoyelles, St. Landry, St. Tammany, and Terrebonne Parishes under FEMA declaration 4927-DR. The relief covers returns and estimated payments automatically — but not payroll tax deposits or 1099s — and a Section 165(i) election lets storm-damaged businesses claim casualty losses on last year's return.
The IRS pushed most federal tax deadlines for the May 16, 2025 St. Louis tornado (FEMA DR-4877) to November 3, 2025 — but the Section 165(i) election to deduct disaster losses on a 2024 return stays open until October 15, 2026, and penalty-free retirement withdrawals and SBA loans up to $2 million remain in play for affected businesses.
