UK tax, payroll and HMRC rules — 2026/27 checks
Employer costs, VAT, IR35, statutory pay and filing rules for the 2026/27 tax year. Each check works on your own figures and cites the HMRC rule or notice it follows.
24 tools
Expensive Car Supplement Cliff Check 2026-27
Browser extension · Chrome, Edge, Firefox
From 1 April 2026 there are two VED lines: £50,000 for zero-emission cars and £40,000 for petrol, diesel and hybrid.
UK Alcohol Duty per SKU (2026 Rates)
Browser extension · Chrome, Edge, Firefox
Duty per can, bottle or keg at the rates that took effect 1 February 2026, with draught relief and the 20-litre container test.
Pension IHT 2027 Check - UK death-benefit tax on an unused pot
Browser extension · Chrome, Edge, Firefox
Apportioned inheritance tax, the beneficiary's income tax on top and the two HMRC dates, for deaths from 2027-04-06
Umbrella PAYE Liability Check 2026
Browser extension · Chrome, Edge, Firefox
The PAYE and NIC an umbrella chain can push onto your agency, worked out in the browser
UK Right to Work Exposure - 1 October 2026 Scope Change
Browser extension · Chrome, Edge, Firefox
What the new agency, subcontractor and platform duty costs you per unchecked engagement
UK Cash-Flow Insolvency Test 2026 - s.123 limbs and s.214 exposure
Browser extension · Chrome, Edge, Firefox
Type your own 13-week cash figures; it says which limb of Insolvency Act 1986 s.123 is tripped today and what another eight weeks of trading adds to the deficiency.
Skilled Worker Sponsor Cost Gate 2026/27
Browser extension · Chrome, Edge, Firefox
Price the whole Home Office bill and test the offered salary against the £41,700 floor before you assign the certificate.
Age Gate Lint — UK Online Safety Act
VS Code extension
8 rules for Ofcom's highly effective age assurance duty, in force since 25 July 2025, where the penalty ceiling is £18m (£18 million) or 10% of qualifying worldwide…
UK SSP 2026: what day-one sick pay costs you
Browser extension · Chrome, Edge, Firefox
Prices one absence and a year of absences under the 6 April 2026 statutory sick pay rules, and shows the gap against the old three-waiting-day rule.
FedRAMP OSCAL SSP Lint
VS Code extension
16 checks on a system-security-plan JSON, in your editor, before a validator returns the package
TOGC & Option to Tax Cost Check (UK commercial property, 2026)
Browser extension · Chrome, Edge, Firefox
Prices what a missed VAT1614A notification costs when the TOGC fails: 20% VAT, the SDLT charged on that VAT, and the months you fund it.
Plastic Packaging Tax 2026-27 Check (UK)
Browser extension · Chrome, Edge, Firefox
Type your tonnage. Get the 10-tonne threshold answer, the bill at the 2026-27 rate of £228.82 a tonne, the late-filing penalty and the exact HMRC due date.
VAT Relief Declaration Gap - UK Notice 701/7 exposure
Browser extension · Chrome, Edge, Firefox
Prices the zero-rated disabled-relief sales you cannot prove, before an HMRC officer does
UK VAT Partial Exemption Calculator 2026
Browser extension · Chrome, Edge, Firefox
Standard method, all three de minimis tests and the annual adjustment date for one VAT period
CGS Threshold Check — the £600,000 rule that started 29 July 2026
Browser extension · Chrome, Edge, Firefox
Type the spend and the date the item was bought or built. It tells you whether the VAT Capital Goods Scheme still owns that asset for ten years, and what this interval's…
Company Car BIK & Class 1A Checker 2026-27 (UK)
Browser extension · Chrome, Edge, Firefox
Type the P11D price, CO₂ and electric range. Get the 2026-27 appropriate percentage, the driver's income tax and the employer's Class 1A at 15% — before the P11D(b) goes…
Companies House ID Verification Deadline Checker (UK, 2026)
Browser extension · Chrome, Edge, Firefox
Your director's real deadline is the company's confirmation statement date, not 18 November 2026.
Redundancy Exit Cost Calculator (UK 2026/27)
Browser extension · Chrome, Edge, Firefox
The employer's real cost of one redundancy on or after 6 April 2026 - statutory pay at the new £751 cap, PILON, the £30,000 exemption and 15% employer NIC.
IR35 Deemed Employer Cost Check 2026/27
Browser extension · Chrome, Edge, Firefox
What an inside-IR35 contractor really costs the fee-payer once employer NI, the Apprenticeship Levy and the April 2024 set-off gap are priced.
MTD for Income Tax 2026: are you in, and on which dates
Browser extension · Chrome, Edge, Firefox
Gross income test, your start date, your four filing dates, and what one late payment costs.
HMRC Fraud Prevention Header Lint for Making Tax Digital (VAT and Income Tax)
VS Code extension
Finds the Gov-Client and Gov-Vendor header mistakes HMRC rejects, in your editor, offline, before you send the request.
UK Pension Annual Allowance & Unclaimed Relief Checker - 2026/27
Browser extension · Chrome, Edge, Firefox
Your tapered allowance, three years of carry-forward, and the higher-rate relief your provider never added - on the 2026/27 figures, in your browser.
UK employer NI and the true cost of a hire - 2026/27
Browser extension · Chrome, Edge, Firefox
Type the salary you are about to offer and see what it actually costs you a year, a month and an hour on the rates in force from 6 April 2026: 15% employer NI above a…
Late Payment Interest Claim - UK, EU and Germany, 2026 rates
Browser extension · Chrome, Edge, Firefox
Work out what you may legally add to an overdue B2B invoice: statutory interest at the locked half-year rate, plus the automatic fixed compensation almost every invoice…
Questions
Do my files leave my computer?
No. The extensions and command-line checks run on your machine and your files are not uploaded. The browser calculators run in the page.
What does it cost?
Every tool is free for the file or case in front of you. The paid part is a one-time licence key; each tool page shows its price and what the key adds. A team key ($149 once) opens every ReadyStack linter for five seats and CI.
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