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WorksFinance and paymentsCode and development

TapTax

UK tax: take-home pay, self-employed and company tax, VAT, stamp duty, invoices and MTD.

Addresshttps://api.taptax.co.uk/mcp
Claude Codeclaude mcp add --transport http taptax https://api.taptax.co.uk/mcp
For Cursor and other clients
{
  "mcpServers": {
    "taptax": {
      "type": "http",
      "url": "https://api.taptax.co.uk/mcp"
    }
  }
}

Watch out

Has tools that change things: 3 of them

The server itself marks these tools as deleting or overwriting data (destructiveHint): have the agent ask you before it calls them.

Test
Works: Handshake succeeded
Tools
49 tools
Handshake
880 ms
Transport
streamable-http · 2025-06-18
Tested
6 November 2026
Registry name
uk.co.taptax/taptax v1.1.1
Listed
10 October 2026
Updated
10 October 2026
Website
taptax.co.uk/integrations/claude
Source
github.com/udohsolomon/taptax-mcp
The last 1 tests
WhenResultTime
2026-11-06 12:40 UTCHandshake succeeded880 ms

The 49 tools it listed

"Read only" and "Changes data" are the server's own marks. Underlined parameters are required.

  1. add_transaction

    Add income or an expense

    Record a business income or expense in the signed-in person's TapTax, such as a receipt or a payment. The category is the HMRC self-employment box it belongs in. The same entry added twice within 10 minutes is recorded once.

    type amount date description category personal

  2. calculate_capital_gains_taxRead only

    Calculate Capital Gains Tax

    Calculate UK Capital Gains Tax on selling an asset (residential property, shares, a business qualifying for Business Asset Disposal Relief, or other assets) for a tax year: the gain after costs, losses and the annual exempt amount, tax at each rate given other income, and the payment deadline.

    assetType proceeds costBasis allowableCosts losses otherIncome disposalDate taxYear

  3. calculate_child_benefit_chargeRead only

    Calculate the High Income Child Benefit Charge

    Calculate the High Income Child Benefit Charge on an adjusted net income and the Child Benefit received in a tax year: the charge, the benefit kept, and the income the charge starts from.

    adjustedNetIncome annualChildBenefit taxYear

  4. calculate_cis_deductionRead only

    Calculate a CIS deduction

    Calculate the Construction Industry Scheme deduction on a payment (labour only, materials excluded) at the registered, unregistered or gross-payment rate, the amount received, and whether the year's deductions are likely to be more or less than the tax actually due.

    grossPayment materialsAmount cisStatus annualIncome expenses taxYear

  5. calculate_contractor_day_rateRead only

    Calculate contractor day rate income

    Turn a contractor day rate into annual and monthly income, an hourly equivalent, and take-home pay as a sole trader, through a company outside IR35 and inside IR35, with the best route and the PAYE salary that would take home as much, for a tax year.

    dayRate billableDays hoursPerDay businessExpenses accountancyCost taxYear

  6. calculate_corporation_taxRead only

    Calculate corporation tax

    Calculate UK corporation tax on a company's taxable profit for a tax year, including marginal relief between the small profits and main rates, with profit after tax and the effective rate.

    taxableProfit taxYear

  7. calculate_dividend_taxRead only

    Calculate dividend tax

    Calculate UK tax on dividends for a tax year, given the dividends and other income: the dividend allowance, tax at the basic, higher and additional dividend rates, and the effective rate.

    dividendIncome otherIncome taxYear

  8. calculate_gross_salary_for_take_homeRead only

    Work out the salary for a take-home figure

    Work out the gross UK salary needed to take home a given amount a year after income tax, employee National Insurance, student loan and a pension percentage, for a tax year (net to gross).

    targetTakeHome pensionPercent studentLoanPlan scottishTaxpayer taxYear

  9. calculate_invoice_due_dateRead only

    Calculate an invoice due date

    Calculate the date an invoice is due from its date and the payment terms (on receipt, a number of days, end of month, days after month end, a day of the following month, or the statutory 30-day default), with the weekday and whether the terms exceed the statutory limit.

    invoiceDate terms days dayOfMonth customer

  10. calculate_late_payment_interestRead only

    Calculate late payment interest on an invoice

    Calculate the statutory interest (Bank of England base rate plus 8%) and fixed compensation a business can claim on a late-paid commercial invoice under the Late Payment of Commercial Debts Act, from the amount, the due date and the payment date.

    amount dueDate paidOn

  11. calculate_markupRead only

    Calculate a price from a markup

    Calculate the selling price, profit and the equivalent profit margin from a cost and a markup percentage.

    cost markupPercent

  12. calculate_mileage_allowanceRead only

    Calculate the mileage allowance

    Calculate the tax-free business mileage allowance for a year at HMRC's approved mileage rates for a car or van, motorcycle or bicycle, including the passenger rate, and the tax it saves at the basic or higher rate.

    annualBusinessMiles vehicleType taxBand passengerTrips averageMilesPerPassengerTrip

  13. calculate_pension_tax_reliefRead only

    Calculate pension tax relief

    Compare a self-employed person's tax with their current and a higher personal pension contribution in a tax year: the basic-rate relief added to the pension, the reduction in the tax bill, and the net cost of the extra contribution.

    grossIncome businessExpenses currentPensionContribution targetPensionContribution taxYear

  14. calculate_pro_rata_salaryRead only

    Calculate a pro rata salary

    Work out a part-time salary from the full-time salary and the hours or days worked compared with full time, with the take-home pay on the pro rata salary for a tax year.

    fullTimeSalary fullTimeUnits actualUnits studentLoanPlan scottishTaxpayer taxYear

  15. calculate_profit_marginRead only

    Calculate a profit margin

    Calculate the profit margin and markup from a cost and a selling price, or the selling price needed for a target margin.

    cost price targetMarginPercent

  16. calculate_rental_income_taxRead only

    Calculate tax on rental income

    Calculate UK income tax on rental profit for a landlord in a tax year, given rent, allowable expenses, mortgage interest (relieved as a 20% tax credit) and other income.

    grossRent allowableExpenses mortgageInterestPaid otherIncome taxYear

  17. calculate_salary_sacrificeRead only

    Calculate salary sacrifice savings

    Compare pay before and after a salary sacrifice for a pension or an electric company car: income tax, National Insurance and student loan saved, employer National Insurance saved and passed back, benefit-in-kind tax for a car, the drop in take-home pay, and for a pension the cost per pound added and the saving against paying in from net pay.

    grossSalary sacrificeAmount sacrificeType employerNIPassback carP11dValue studentLoanPlan scottishTaxpayer taxYear

  18. calculate_savings_interest_taxRead only

    Calculate tax on savings interest

    Calculate UK tax on savings interest for a tax year, given the interest, any tax already deducted and other income: the starting rate for savings, the Personal Savings Allowance and the tax due.

    grossInterest taxDeductedAtSource otherIncome taxYear

  19. calculate_stamp_dutyRead only

    Calculate Stamp Duty

    Calculate the tax on buying property: Stamp Duty Land Tax in England and Northern Ireland, Land and Buildings Transaction Tax in Scotland or Land Transaction Tax in Wales, by band, with first-time buyer relief, the additional property surcharge and the non-resident surcharge where they apply.

    price country propertyUse firstTimeBuyer ownsOtherResidentialProperty replacingMainResidence ukResident company completionDate

  20. calculate_student_loan_repaymentRead only

    Calculate student loan repayments

    Calculate yearly, monthly and weekly UK student loan repayments on an income for a repayment plan (Plan 1, 2, 4 or the postgraduate loan) in a tax year.

    annualIncome plan taxYear

  21. calculate_take_home_payRead only

    Calculate take-home pay

    Calculate take-home pay from a UK salary for a tax year: income tax by band (England, Wales and Northern Ireland, or Scotland), employee National Insurance, student loan repayment and pension contributions, with yearly, monthly and weekly take-home and the employer National Insurance and total cost to the employer.

    grossSalary pensionContributions studentLoanPlan scottishTaxpayer taxYear

  22. calculate_tax_on_multiple_incomesRead only

    Calculate tax on several incomes

    Calculate the combined UK tax on income from several sources in one tax year (employment, self-employment, rental profit, dividends and savings interest), allowing for PAYE tax already deducted: income tax, National Insurance, student loan, what is left to pay and take-home.

    employment payeTaxDeducted selfEmployment rentalProfit dividendIncome savingsInterest pensionContributions studentLoanPlan taxYear

  23. calculate_vatRead only

    Add or remove VAT

    Add VAT to a net price or take it out of a gross price at the standard (20%), reduced (5%) or any other rate, with the net, VAT and gross amounts.

    amount direction ratePercent

  24. check_mtd_statusRead only

    Check if Making Tax Digital applies

    Say whether and when Making Tax Digital for Income Tax applies to someone, from their qualifying income: self-employment turnover plus property income, before expenses, as on their Self Assessment return. Employment and pension income do not count.

    selfEmploymentTurnover propertyIncome

  25. check_tax_codeRead only

    Check a PAYE tax code

    Check whether a UK PAYE tax code (e.g. 1257L, BR, K475, 1257L W1/M1) looks right for a salary and circumstances, explain what it means, and estimate any over- or under-payment. Flat-rate codes (BR, D0, D1) are only judged when hasMultipleJobs is known; without it the verdict is needs_info. Returns a verdict tier; refund figures are estimates, not amounts owed.

    taxCode grossSalary taxYear scotland hasMultipleJobs monthsOnCode hasCompanyCar otherBenefitsInKindValue receivesStatePension hasMarriageAllowance marriageAllowanceDirection

  26. check_vat_registrationRead only

    Check VAT registration and the Flat Rate Scheme

    Check whether a turnover is over the UK VAT registration threshold for a tax year, and compare VAT payable under the standard scheme with the Flat Rate Scheme for the business's sector rate, including the first-year discount, with the cheaper scheme and the difference.

    annualTurnover vatablePurchases flatRatePercent firstYearOfVatRegistration taxYear

  27. check_vat_reverse_chargeRead only

    Check the construction VAT reverse charge

    Work out whether the domestic VAT reverse charge for construction services applies to an invoice, by HMRC's decision steps. Takes the yes or no answers known so far and returns the next question to answer, or the outcome with what the invoice must say.

    answers

  28. compare_inside_and_outside_ir35Read only

    Compare inside and outside IR35

    Compare a contractor's take-home pay working inside IR35 (deemed employment payment, employer National Insurance) with working outside IR35 through a limited company, from the day rate and working days, for a tax year. It compares pay; it does not decide IR35 status.

    dayRate workingDays businessExpenses accountancyCost taxYear

  29. compare_limited_company_and_sole_traderRead only

    Compare a limited company and sole trader

    Compare take-home pay as a sole trader with running the same profit through a limited company (salary plus dividends, corporation tax and accountancy cost) for a tax year, with the annual difference and an approximate break-even profit.

    annualProfit accountancyCost taxYear

  30. compare_salary_and_dividendsRead only

    Compare salary and dividends

    For a limited company director, work out take-home pay from a chosen salary plus dividends paid from the remaining profit after employer National Insurance and corporation tax, with every tax and the effective rate, for a tax year.

    companyProfitBeforeSalary salary taxYear

  31. convert_hourly_rate_to_salaryRead only

    Convert an hourly rate to a salary

    Convert an hourly rate to the annual salary it adds up to for the hours a week and paid weeks a year given, with take-home pay on that salary for a tax year.

    hourlyRate hoursPerWeek paidWeeksPerYear studentLoanPlan scottishTaxpayer taxYear

  32. convert_salary_to_hourly_rateRead only

    Convert a salary to an hourly rate

    Convert an annual salary to its gross hourly rate and the take-home pay per hour, for the hours a week and paid weeks a year given, in a tax year.

    annualSalary hoursPerWeek paidWeeksPerYear studentLoanPlan scottishTaxpayer taxYear

  33. create_invoice

    Create an invoice

    Create and save a draft invoice in the signed-in person's TapTax account from a client name and one or more line items. No saved client, earlier invoice or client email is needed to create it; an email is only needed later, to send it. It is numbered in their sequence, uses their saved business details, and is not sent. Free plans include 3 invoices; paid plans are unlimited.

    clientName clientEmail clientAddress items issueDate dueDate dueInDays vatRatePercent notes

  34. estimate_self_assessment_penaltiesRead only

    Estimate Self Assessment penalties

    Estimate Self Assessment late filing penalties, late payment penalties and late payment interest on the tax due, from how many days late the return was filed and the tax was paid.

    taxDue filingDaysLate paymentDaysLate annualInterestRatePercent

  35. estimate_self_employed_taxRead only

    Estimate self-employed tax

    Estimate UK income tax and Class 4 National Insurance for a sole trader from turnover and allowable expenses, with the take-home figure, effective and marginal rates, payments on account and tailored tips, from HMRC's published rates for the tax year. Works from the figures given, without a TapTax account.

    taxYear turnover expenses businessMiles otherIncome taxDeductedAtSource pensionContributions studentLoanPlan

  36. generate_invoice_numbersRead only

    Generate invoice numbers

    Generate invoice numbers: the next number after a given one (keeping its prefix and zero padding), or a run of numbers in a chosen format (prefix, separator, optional year or month, number of digits) from a starting number.

    lastNumber prefix separator datePart digits start count

  37. get_mileage_summaryRead only

    Get my mileage

    Read the signed-in person's own mileage log in their TapTax account for a tax year: total miles, the deductible amount at the approved rates, and the most recent trips.

    taxYear

  38. get_mtd_deadlinesRead only

    Making Tax Digital deadlines

    List the standard Making Tax Digital quarterly update periods and deadlines for a tax year, and which one is next. Updates are cumulative from 6 April.

    taxYear

  39. get_tax_positionRead only

    Get my tax position

    Read the signed-in person's own TapTax account: their tax year so far, as their dashboard shows it: business income, expenses and profit counted by the filing rule, the estimated income tax and Class 4 NI, how many transactions still need a business-or-personal decision, which quarterly updates they have filed through TapTax, and the next deadline. Needs no figures from the person: everything comes from their records.

    taxYear

  40. list_invoicesRead only

    List my invoices

    Read the signed-in person's own invoices from their TapTax account, newest first, with each one's live status (a sent invoice past its due date reads as overdue) and the totals outstanding and overdue. Needs no details from the person.

    status limit

  41. list_transactionsRead only

    List my transactions

    Read and search the signed-in person's own income and expense records in their TapTax account, newest first. Filter by tax year or dates, type, text in the description, or needsReview=true for the ones still waiting for a business-or-personal decision (the review queue). Needs no details from the person beyond what to look for.

    taxYear from to type search needsReview limit

  42. log_mileage_trip

    Log a business trip

    Record a business journey in the signed-in person's mileage log. TapTax prices it at the approved mileage rate for the tax year (tiered after 10,000 car miles). Commuting to a permanent workplace is not business mileage. Mileage tracking is on the Pro plan.

    date from to miles vehicle purpose

  43. mark_invoice_paidChanges data

    Mark an invoice paid

    Record that the client has paid an invoice (dated today). Stops any payment reminders.

    invoiceId

  44. plan_quarterly_tax_set_asideRead only

    Plan how much tax to set aside

    Plan how much to set aside for tax as a sole trader under Making Tax Digital, from the year's profit or each quarter's profit: the income tax, Class 4 National Insurance and student loan due, monthly and weekly amounts to put away, running totals by quarter with each update deadline, and any first payment on account.

    annualProfit quarterlyProfits studentLoanPlan firstYearOfTrading

  45. prepare_business_documentRead only

    Prepare an invoice, quote or receipt to download

    Prepare an invoice, quote, receipt, credit note or pro forma invoice in TapTax's free document generator, without a TapTax account. Returns the totals and a link that opens the generator with the document filled in, where the person checks it, adds a logo if they like, and downloads the PDF. The details travel in the link itself and are not stored by TapTax.

    kind lines vatRatePercent clientName clientAddress clientEmail fromName fromAddress number date paymentTerms notes template

  46. prepare_quarterly_updateRead only

    Prepare my quarterly update

    Get the signed-in person's Making Tax Digital quarterly update ready: the cumulative income, expenses and profit from 6 April to the end of the quarter, what still needs reviewing, and a card with a button that opens TapTax to check and file it. Filing itself always happens in the TapTax app, never from the chat, so HMRC receives the details of the device the person files from.

    taxYear quarter

  47. send_invoice

    Show an invoice ready to send

    Get one of the signed-in person’s invoices ready to email, with its PDF, to the client address on it from their business name. It opens a card showing exactly what the client will receive (who it goes to, the lines and the total) with a Send button. Nothing is emailed until the person presses Send on that card.

    invoiceId

  48. send_invoice_from_cardChanges data

    Send the invoice shown on the card

    Emails the invoice shown on a TapTax send card to its client, when the person presses Send on that card. Needs the one-time token the card was given.

    invoiceId sendToken

  49. update_transactionChanges data

    Update or review a transaction

    Change a transaction the signed-in person owns: mark it business or personal (this is how the review queue is cleared), or correct its category, description, amount or date.

    id businessOrPersonal category description amount date

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