#tax-deadlines
Tax Deadlines
Important tax filing deadlines and compliance dates to remember
Pay As You Go: How Small Businesses Avoid the Estimated Tax Underpayment Penalty With Safe Harbor Rules for 2026
Hit one estimated-tax safe harbor and the IRS underpayment penalty disappears — pay 90% of this year's tax or 100% of last year's (110% if prior-year AGI topped $150,000) through timely quarterly payments. Covers the 2026 penalty rate (7% Q1/Q3, 6% Q2, compounded daily), the four due dates, and a bookkeeping system that keeps you penalty-free.
Provisional Tax in South Africa: The Freelancer's Complete Guide to IRP6 Deadlines, Estimates, and Avoiding SARS Penalties
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.
IRS Business Tax Account Revalidation: Why Your S-Corp or C-Corp Access Expires Every Year
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.
Circular E in Plain English: What Publication 15 Tells Small Employers About Withholding, Deposits, and Forms 941 and W-2
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%.
Missed the July 4 Clean Energy Tax Credit Deadline? What Small Businesses Can Still Do After the Section 48E Window Closed
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.
Making Tax Digital for Income Tax: Half of UK Sole Traders Missed the First Quarterly Update — What to Do Before 7 November 2026
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.
COVID-19 Tax Penalty Refunds: Your Last Chance Before July 10, 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.
Canada's New Bare Trust Reporting Rules Under Bill C-15: Who Actually Has to File for the 2026 Tax Year
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 in 2026: How Canadian Sole Proprietors File Business Income, CPP, and NETFILE Without Triggering a CRA Review
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.
Ireland's Self-Employed Tax Guide for 2026: Form 11, Preliminary Tax, and the PRSI Rate Rise
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.
You Missed the July 4 Solar Deadline. Here's What's Actually Left of the Business Tax Credit
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.
Louisiana Tropical Storm Arthur Tax Relief: What the November 2, 2026 IRS Deadline Covers for Business Owners
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.