Tax Calculator Ireland & UK — Free Online
Free tax calculator for Ireland and the UK: estimate income tax, USC, PRSI, and National Insurance for sole traders and limited companies. Band-by-band calculations with 2026 Irish and 2026/27 UK rates — free, instant, and not financial advice.
Every number traced back to where it came from
This calculator gives you a quick planning estimate from figures you typed in. Inside the product the same arithmetic runs on your actual transactions — and every line shows which bank entry, receipt, or rule produced it, so a wrong number is quick to spot and quick to correct. Our Chartered Accountant team provides insight on AI drafts; a qualified professional still signs off filings.
- Each figure links back to the transactions and documents behind it
- Uncertain classifications are flagged for review, not silently assigned
- Deduction suggestions come with the reasoning, so you can reject them on the facts
Tax estimates and draft return packs for Form 11, SA100, and corporation tax — prepared for you or your qualified adviser to review and file. Start a trial and see draft returns update as transactions sync — no chasing, no surprise consultation bills.
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Tax calculator questions
Answers for Irish Revenue and UK HMRC rules — income tax bands, USC, PRSI, National Insurance, and sole trader vs limited company estimates.
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Rates reflect 2026 Irish and 2026/27 UK rules. This is general guidance — confirm your position with Revenue or HMRC before filing.
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Bookkeeping, expenses, invoices, VAT and tax prep for Ireland and the UK — with the working shown behind every suggestion, and you in control before anything is shared or filed.
Tax calculator Ireland — how to estimate your liability
A tax calculator for Ireland helps sole traders and limited company directors estimate income tax, USC, and PRSI before filing Form 11. Enter your annual profit, select your business structure, and see band-by-band calculations with current Revenue rates.
This free online tax calculator applies 2026 Irish income tax bands (€44,000 standard rate for single individuals), €4,000 tax credits, USC progressive bands, and Class S PRSI at 4.2%. No sign-up or download required — results update instantly in your browser.
Irish income tax calculator for sole traders
Sole traders in Ireland pay income tax on profits after allowable expenses, plus USC on gross income above €13,000 and PRSI at 4.2% (minimum €650). The calculator shows each component separately so you can plan provisional tax instalments.
For limited companies, switch to the company structure to estimate corporation tax at 12.5% on trading profits, plus personal tax on director salary and dividends. Compare sole trader vs limited company take-home in one view.
UK tax calculator — self-assessment and limited companies
Select United Kingdom to estimate self-assessment income tax after the £12,570 personal allowance, plus Class 4 National Insurance at 6% and 2% bands. Limited company estimates include corporation tax at 19%/25% with marginal relief.
Irish and UK rules differ on bands, credits, and filing deadlines. Always confirm your position with Revenue or HMRC before filing — this calculator is for planning, not filing. Mandated sole traders and landlords should also track Making Tax Digital for Income Tax quarterly updates separately from this estimate tool.
Student loans inside MTD quarterly updates
If you repay a Plan 1–5 student loan or a postgraduate loan, MTD-compatible software may show estimated loan repayments after each quarterly update. HMRC confirms those in-year estimates are not payable — the annual charge is calculated on the tax return and due by 31 January following the tax year. Use this calculator only for high-level Income Tax and National Insurance planning, not student-loan repayment maths.
UK mileage rates and take-home planning
From 6 April 2026, HMRC Approved Mileage Allowance Payments and self-employed simplified mileage rates rose to 55p for the first 10,000 business miles (25p thereafter). Use this tax calculator for high-level Income Tax and National Insurance estimates after updating expense policies — then read the AMAPs briefing for employer and sole-trader catch-up steps.
Limited companies — no MTD for Corporation Tax
HMRC’s Transformation Roadmap confirms it does not intend to introduce Making Tax Digital for Corporation Tax. UK limited companies continue annual CT600 filing while HMRC modernises CT systems toward 2028. Use this calculator for high-level company vs sole-trader planning only — it is not a CT computation tool, and directors with personal self-employment or property income may still be in MTD for Income Tax in their own name.
MMTAR — final day before tranche one closes 18 August
As of 17 August, HMRC’s first Modernising and Mandating Tax Adviser Registration window closes tomorrow for new advisers and those without an ASA, Self Assessment, or Corporation Tax agent account. This calculator does not model adviser registration — keep ASA applications on a separate firm checklist from client tax estimates.
Ireland VAT 3 — two days to 19 August
Revenue’s August calendar puts July monthly VAT 3 (and annual VAT 3 where the period ends in July) on 19 August. This calculator is for high-level Income Tax planning only — use the VAT calculator for rate checks, not ROS filing.
Agent MFA — 48 hours to 19 August activation
Agents who opted in by 31 July 2026 have about 48 hours until MFA activates on 19 August. This calculator does not model portal security — keep authenticator and admin checklists separate from client tax estimates.
Third-party data — three days to 20 August close
HMRC’s technical consultation on interest and card-sales draft legislation closes at 11:59pm on 20 August 2026. This calculator does not model data-holder reporting — keep consultation responses and client interest/sales evidence on separate tracks.
Ireland — six days to 23 August PAYE, RCT and CT
From mid-August, Irish employers and principals face ROS PAYE payment (where the extension applies), July RCT, and Corporation Tax windows through 23 August. This calculator is for high-level Income Tax planning only — not ROS payroll or CT computations.
MTD — HMRC sign-up from September 2026
HMRC confirmed more than 436,000 first quarterly updates and will begin signing up remaining in-scope MTD for Income Tax customers from September 2026, with late-August guidance on sign-up letters. This calculator is for high-level Income Tax and National Insurance planning only — not quarterly update totals or software signup.
Ireland — final August ROS week to 23rd
From mid-August, Irish employers and VAT-registered SMEs face VAT 3 on 19 August then PAYE payment (ROS extension), RCT, and Corporation Tax windows through 23 August. This calculator is for high-level Income Tax planning only — use the VAT calculator for rate checks, not ROS filing.
MMTAR — tranche-two weekend prep before 18 August
Advisers with a Self Assessment or Corporation Tax agent account but no ASA should finish weekend prep before the second MMTAR window opens 18 August 2026. This calculator does not model adviser registration — keep ASA applications on a separate firm checklist from client tax estimates.
Agent MFA — 72 hours to 19 August activation
Agents who opted in by 31 July 2026 have about 72 hours until MFA activates on 19 August. This calculator does not model portal security — keep authenticator and admin checklists separate from client tax estimates.
Third-party data — four days to 20 August close
HMRC’s technical consultation on interest and card-sales draft legislation closes at 11:59pm on 20 August 2026. This calculator does not model data-holder reporting — keep consultation responses and client Interest/sales evidence on separate tracks.
MMTAR — 72 hours to 18 August tranche one
HMRC’s first Modernising and Mandating Tax Adviser Registration window closes on 18 August 2026 for new advisers and those without an ASA, Self Assessment, or Corporation Tax agent account. This calculator does not model adviser registration — keep ASA applications on a separate firm checklist from client tax estimates.
Ireland VAT 3 — four days to 19 August
Revenue’s August calendar puts July monthly VAT 3 (and annual VAT 3 where the period ends in July) on 19 August, with ROS file-and-pay extension to the 23rd. This calculator is for high-level Income Tax planning only — use the VAT calculator for rate checks, not ROS filing.
ITSA timely payments — consultation closed, autumn response
HMRC’s Timely Payments consultation closed on 4 August 2026. A summary of responses is expected in autumn 2026 ahead of April 2029 PAYE collection changes for Self Assessment taxpayers with PAYE income. This calculator remains a planning estimate — not an in-year collection forecast.
Ireland Form 11 — mid-year Pay & File prep
After August PAYE and VAT deadlines, start Form 11 evidence packs for Pay & File: 31 October 2026, or 18 November 2026 for ROS customers who both pay and file (eBrief 034/26). This calculator is a high-level Income Tax, USC, and PRSI estimate only — not a Form 11 computation.
Finance Bill draft clauses — close today 7 September
Most Finance Bill 2026-27 draft legislation technical consultation closes today, 7 September 2026. Separate longer consultations (LRR and predevelopment costs to 21 September; NICs recovery to 12 October). This calculator does not model draft Finance Bill measures.
Agents’ critical fortnight — 18 to 20 August
UK agents face three HMRC milestones in 48 hours: MMTAR tranche-one applications by 18 August, MFA activation for opted-in firms on 19 August, and the third-party interest/card-sales consultation close at 11:59pm on 20 August. This calculator does not model adviser registration or portal security — keep those firm checklists separate from client tax estimates.
Solicitors and SDLT — register by 18 August
Residential conveyancers who file or pay Stamp Duty Land Tax for clients generally need an Agent Services Account under MMTAR. HMRC and the Law Society confirm SDLT interaction is enough for scope even when no tax advice is given. This calculator does not model SDLT or adviser registration.
Ireland CT1 — 23 September for December year-ends
Irish companies with a 31 December 2025 accounting period must file Form CT1 and pay any balance through ROS by 23 September 2026. This calculator is a high-level planning estimate only — not a CT1 computation — so keep iXBRL accounts and Form 46G on a separate corporation-tax checklist.
Interest and card sales data — consultation closes 20 August
HMRC’s third-party data technical consultation closes at 11:59pm on 20 August 2026, covering draft rules for bank interest and card sales reporting from April 2028. Organised sales and interest records make it easier to explain totals when HMRC matches third-party feeds. This calculator remains a planning estimate — keep merchant settlements and interest certificates with your tax pack.
MMTAR tranche two — ASA registration from 18 August
From 18 August 2026, tax advisers with a Self Assessment or Corporation Tax agent account but no Agent Services Account enter HMRC’s second MMTAR registration window (three months to apply). This calculator does not model adviser registration — keep ASA applications on a separate firm checklist from client tax estimates.
First MTD quarterly update — 7 August 2026
In-scope sole traders and landlords with qualifying income over £50,000 must send the first Making Tax Digital for Income Tax quarterly update by 7 August 2026. The update is a category summary through compatible software — not a tax return and not a payment. Use this calculator only for high-level Income Tax and National Insurance planning while you finish digital records for the update.
After the first MTD update — estimates and 7 November
Once you send a quarterly update, software or your HMRC account may show a tax bill estimate for self-employment and property income — a planning figure, not a payment demand. Keep digital records current for the second update deadline on 7 November 2026. This calculator remains a high-level Income Tax and National Insurance estimate only.
Missed the 7 August MTD deadline?
HMRC will not apply late quarterly-update penalty points in 2026/27, but you still need to send every quarterly update before the tax return. Catch up on digital records and send as soon as totals are ready — the next deadline is 7 November 2026. This calculator remains a planning estimate only.
Landlords still outside MTD after 7 August
Industry reporting after the first quarterly update deadline flagged a large landlord and sole-trader registration gap. Soft landing pauses late-update points for 2026/27, but digital records and sends still matter before 7 November. Use this calculator only for high-level Income Tax and National Insurance planning while you finish property income packs.
Agent MFA — 19 August and autumn window
Agents who opted in by 31 July 2026 have multi-factor authentication activating on 19 August; others face the 28 September to 15 October automatic window with no specific day from HMRC. This calculator does not model agent portal security — keep MFA prep on a separate checklist from client tax estimates.
Tax adviser registration — final week to 18 August
HMRC’s first Modernising and Mandating Tax Adviser Registration window closes 18 August 2026 for new advisers and those without an Agent Services Account, Self Assessment, or Corporation Tax agent account. Complete AML supervision before applying for an ASA. This calculator does not model adviser registration.
Ireland 14 August — PAYE, DWT and PSWT
Revenue’s August 2026 calendar puts employer PAYE/PRSI/USC/LPT for July, Dividend Withholding Tax, and Professional Services Withholding Tax F30 on 14 August (ROS payment extension to the 23rd where you file and pay online). This calculator is for high-level income-tax planning only — not payroll or withholding computations.
HMRC Customer Correction Notices — comment by 7 September
Draft Finance Bill 2026-27 clauses would create an explicit duty to correct return errors once you know about them and give HMRC a Customer Correction Notice power. Technical consultation closes 7 September 2026. This calculator does not model notices or amendments — keep self-correction on a separate checklist from planning estimates.
HMRC Customer Correction Notices: draft before 7 September →
UK CT late filing penalties — doubled rates live
For Company Tax Returns with filing dates on or after 1 April 2026, HMRC’s guide shows £200 from day one and £400 after three months (higher for successive failures). This calculator does not estimate Corporation Tax penalties — diary CT600 dates separately from personal income-tax planning.
Crypto loans & liquidity pools — NGNL from April 2027
Draft Finance Bill 2026-27 rules treat qualifying cryptoasset lending, borrowing, and automated market-maker pool transfers as no gain, no loss for Capital Gains Tax from 6 April 2027. This calculator does not model crypto CGT — keep DeFi transaction histories on a separate Self Assessment pack.
Ireland RCT — July return due 23 August
Revenue’s August 2026 calendar puts the Relevant Contracts Tax monthly return and payment for July on 23 August. Principal contractors should verify the ROS deduction summary before it deems. This calculator does not model RCT rates or deductions.
Ireland CT preliminary tax — September year-ends
Revenue’s August calendar puts Corporation Tax preliminary tax for accounting periods ending 1–30 September 2026 on the 1–23 August electronic window (1–21 if not electronic), alongside CT1 returns and balances for November 2025 periods. This calculator is a high-level planning estimate only — not a preliminary tax computation.
UK Land Remediation Relief — consultation to 21 September
HM Treasury’s second Land Remediation Relief consultation seeks views on planning-aligned contamination rules, derelict-land definitions, and claiming relief when spend is incurred. Responses close 21 September 2026. This calculator does not model LRR claims.
UK Land Remediation Relief consultation before 21 September →
UK predevelopment costs — consultation to 21 September
HM Treasury is gathering evidence on capital allowances treatment of predevelopment costs after the Supreme Court’s Orsted judgment. Responses close 21 September 2026. This calculator does not model plant and machinery capital allowances.
Ireland September 2026 ROS cluster
Revenue’s September calendar puts PAYE for August on 14 September, bi-monthly and monthly VAT 3 on 19 September, and CT1 / RCT windows through the 23rd. This calculator is a high-level planning estimate only — not a ROS filing pack.
NICs recovery time limits — consultation to 12 October
HMRC proposes aligning National Insurance contribution recovery windows with Income Tax (4 / 6 / 20 years by behaviour) and removing Limitation Act constraints. Consultation closes 12 October 2026. This calculator does not model NIC underpayment assessments.
Carried interest as trading profits from April 2026
From 6 April 2026, UK carried interest is taxed as trading profits under Income Tax (and Class 4 NICs where applicable), with a 72.5% multiplier for qualifying amounts. This calculator does not model carried interest — keep fund schedules separate from personal income-tax planning estimates.
EMI grant notifications — draft change from April 2027
Draft Finance Bill 2026-27 rules would remove the separate EMI grant notification for options granted on or after 6 April 2027, with grants reported on the EMI end-of-year return instead. Technical consultation closes 7 September 2026. This calculator does not model share schemes — keep EMI admin on a separate checklist from personal income-tax estimates.
Related free calculators and VAT services
Registered or approaching the €85,000 VAT threshold in Ireland or the £90,000 UK threshold? Use our free VAT calculator for Ireland and the UK to work out standard and reduced rates, convert net to gross, and estimate set-aside before you file with Revenue or HMRC. For Ireland-specific return prep beyond the calculator, see VAT Services Ireland.
VAT return services for Ireland
Once you are VAT-registered, bi-monthly returns and transaction reconciliation sit alongside income tax planning. Pair this tax calculator with Irish VAT return prep — drafts, threshold monitoring, and Chartered Accountant insight before you or your adviser file with Revenue. Start from VAT Services Ireland after checking rates on the calculator.