WorksFinance and paymentsCode and development
TapTax
UK tax: take-home pay, self-employed and company tax, VAT, stamp duty, invoices and MTD.
https://api.taptax.co.uk/mcpclaude mcp add --transport http taptax https://api.taptax.co.uk/mcpFor 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/taptaxv1.1.1- Listed
- 10 October 2026
- Updated
- 10 October 2026
The last 1 tests
| When | Result | Time |
|---|---|---|
| 2026-11-06 12:40 UTC | Handshake succeeded | 880 ms |
The 49 tools it listed
"Read only" and "Changes data" are the server's own marks. Underlined parameters are required.
add_transactionAdd 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.
typeamountdatedescriptioncategorypersonalcalculate_capital_gains_taxRead onlyCalculate 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.
assetTypeproceedscostBasisallowableCostslossesotherIncomedisposalDatetaxYearcalculate_child_benefit_chargeRead onlyCalculate 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.
adjustedNetIncomeannualChildBenefittaxYearcalculate_cis_deductionRead onlyCalculate 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.
grossPaymentmaterialsAmountcisStatusannualIncomeexpensestaxYearcalculate_contractor_day_rateRead onlyCalculate 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.
dayRatebillableDayshoursPerDaybusinessExpensesaccountancyCosttaxYearcalculate_corporation_taxRead onlyCalculate 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.
taxableProfittaxYearcalculate_dividend_taxRead onlyCalculate 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.
dividendIncomeotherIncometaxYearcalculate_gross_salary_for_take_homeRead onlyWork 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).
targetTakeHomepensionPercentstudentLoanPlanscottishTaxpayertaxYearcalculate_invoice_due_dateRead onlyCalculate 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.
invoiceDatetermsdaysdayOfMonthcustomercalculate_late_payment_interestRead onlyCalculate 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.
amountdueDatepaidOncalculate_markupRead onlyCalculate a price from a markup
Calculate the selling price, profit and the equivalent profit margin from a cost and a markup percentage.
costmarkupPercentcalculate_mileage_allowanceRead onlyCalculate 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.
annualBusinessMilesvehicleTypetaxBandpassengerTripsaverageMilesPerPassengerTripcalculate_pension_tax_reliefRead onlyCalculate 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.
grossIncomebusinessExpensescurrentPensionContributiontargetPensionContributiontaxYearcalculate_pro_rata_salaryRead onlyCalculate 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.
fullTimeSalaryfullTimeUnitsactualUnitsstudentLoanPlanscottishTaxpayertaxYearcalculate_profit_marginRead onlyCalculate 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.
costpricetargetMarginPercentcalculate_rental_income_taxRead onlyCalculate 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.
grossRentallowableExpensesmortgageInterestPaidotherIncometaxYearcalculate_salary_sacrificeRead onlyCalculate 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.
grossSalarysacrificeAmountsacrificeTypeemployerNIPassbackcarP11dValuestudentLoanPlanscottishTaxpayertaxYearcalculate_savings_interest_taxRead onlyCalculate 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.
grossInteresttaxDeductedAtSourceotherIncometaxYearcalculate_stamp_dutyRead onlyCalculate 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.
pricecountrypropertyUsefirstTimeBuyerownsOtherResidentialPropertyreplacingMainResidenceukResidentcompanycompletionDatecalculate_student_loan_repaymentRead onlyCalculate 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.
annualIncomeplantaxYearcalculate_take_home_payRead onlyCalculate 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.
grossSalarypensionContributionsstudentLoanPlanscottishTaxpayertaxYearcalculate_tax_on_multiple_incomesRead onlyCalculate 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.
employmentpayeTaxDeductedselfEmploymentrentalProfitdividendIncomesavingsInterestpensionContributionsstudentLoanPlantaxYearcalculate_vatRead onlyAdd 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.
amountdirectionratePercentcheck_mtd_statusRead onlyCheck 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.
selfEmploymentTurnoverpropertyIncomecheck_tax_codeRead onlyCheck 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.
taxCodegrossSalarytaxYearscotlandhasMultipleJobsmonthsOnCodehasCompanyCarotherBenefitsInKindValuereceivesStatePensionhasMarriageAllowancemarriageAllowanceDirectioncheck_vat_registrationRead onlyCheck 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.
annualTurnovervatablePurchasesflatRatePercentfirstYearOfVatRegistrationtaxYearcheck_vat_reverse_chargeRead onlyCheck 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.
answerscompare_inside_and_outside_ir35Read onlyCompare 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.
dayRateworkingDaysbusinessExpensesaccountancyCosttaxYearcompare_limited_company_and_sole_traderRead onlyCompare 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.
annualProfitaccountancyCosttaxYearcompare_salary_and_dividendsRead onlyCompare 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.
companyProfitBeforeSalarysalarytaxYearconvert_hourly_rate_to_salaryRead onlyConvert 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.
hourlyRatehoursPerWeekpaidWeeksPerYearstudentLoanPlanscottishTaxpayertaxYearconvert_salary_to_hourly_rateRead onlyConvert 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.
annualSalaryhoursPerWeekpaidWeeksPerYearstudentLoanPlanscottishTaxpayertaxYearcreate_invoiceCreate 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.
clientNameclientEmailclientAddressitemsissueDatedueDatedueInDaysvatRatePercentnotesestimate_self_assessment_penaltiesRead onlyEstimate 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.
taxDuefilingDaysLatepaymentDaysLateannualInterestRatePercentestimate_self_employed_taxRead onlyEstimate 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.
taxYearturnoverexpensesbusinessMilesotherIncometaxDeductedAtSourcepensionContributionsstudentLoanPlangenerate_invoice_numbersRead onlyGenerate 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.
lastNumberprefixseparatordatePartdigitsstartcountget_mileage_summaryRead onlyGet 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.
taxYearget_mtd_deadlinesRead onlyMaking 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.
taxYearget_tax_positionRead onlyGet 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.
taxYearlist_invoicesRead onlyList 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.
statuslimitlist_transactionsRead onlyList 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.
taxYearfromtotypesearchneedsReviewlimitlog_mileage_tripLog 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.
datefromtomilesvehiclepurposemark_invoice_paidChanges dataMark an invoice paid
Record that the client has paid an invoice (dated today). Stops any payment reminders.
invoiceIdplan_quarterly_tax_set_asideRead onlyPlan 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.
annualProfitquarterlyProfitsstudentLoanPlanfirstYearOfTradingprepare_business_documentRead onlyPrepare 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.
kindlinesvatRatePercentclientNameclientAddressclientEmailfromNamefromAddressnumberdatepaymentTermsnotestemplateprepare_quarterly_updateRead onlyPrepare 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.
taxYearquartersend_invoiceShow 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.
invoiceIdsend_invoice_from_cardChanges dataSend 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.
invoiceIdsendTokenupdate_transactionChanges dataUpdate 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.
idbusinessOrPersonalcategorydescriptionamountdate
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