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.
From estimate to draft return — ready for review
This calculator gives you a quick planning number. The Tax Agent connects to your books, keeps a draft Form 11 or SA100 ready, and flags savings you might miss — so you spend less time chasing routine admin. Our Chartered Accountant team provides insight on AI drafts; a qualified professional still signs off filings.
- Draft returns built from reconciled transactions, not manual spreadsheets
- Expense and deduction suggestions before you review with your adviser
- Deadline tracking so you are not waiting on consultant callbacks for routine questions
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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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.
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.
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.