Integrations

TapTax in Claude

Ask Claude about your tax, log receipts from a photo, send invoices and get your quarterly update ready, in plain English. Claude does the work; filing to HMRC stays one tap in TapTax.

Connect TapTax to Claude Create a free TapTax account

What happens in the film

Someone asks: how much tax do I owe so far? TapTax answers: £1,550.06 estimated so far this tax year.
The TapTax logo: taptax in Claude. Your books, in plain English.
Your quarter, ready to file: asked to get the Q2 update ready, Claude shows the quarterly card. Its button opens TapTax to check and file. Filing stays one tap in TapTax.
Invoices go when you say: asked to send invoice 14, Claude shows the invoice card. The person presses Send and the card shows it was emailed. Nothing is emailed until you press Send.
37 free tools with no account: take-home pay, dividend tax, IR35, VAT, CIS, mileage, Stamp Duty, Capital Gains Tax and more.
Your account, your call: read-only or read and change, disconnect any time in TapTax Settings, nothing is filed to HMRC from the chat.
Find TapTax in the Claude directory, or at taptax.co.uk/integrations/claude.

Also on YouTube.

How to connect

In Claude on the web, desktop or phone, open Customize, then Connectors, choose Discover and search for TapTax. If TapTax is not listed yet, choose Add custom connector and enter https://api.taptax.co.uk/mcp.
Select Connect, sign in to TapTax, check what Claude is asking for, and select Allow. You come straight back to Claude.
Ask away. The 37 calculators and checkers also work before you connect; Claude asks you to sign in the first time it needs your records.

In Claude Code, add TapTax, then sign in with /mcp:

claude mcp add --transport http taptax https://api.taptax.co.uk/mcp

What you can ask

“How much tax do I owe so far this year?”: Claude reads your tax position: income, expenses and profit counted the way your dashboard counts them, the estimated income tax and Class 4 National Insurance, and your next deadline.
“Log this receipt (with a photo)”: Claude reads the supplier, date and amount from the photo, picks the HMRC expense category, checks anything unclear with you, and records it.
“Invoice Dave £450 for Tuesday’s boiler service and send it”: Claude creates the invoice in your numbering with your business details, then shows it in a card exactly as your client will get it. It is emailed, with the PDF, only when you press Send on that card.
“Sort out the transactions that need reviewing”: Claude lists what is waiting for a business or personal decision and updates each one as you answer.
“Get my Q2 update ready”: Claude shows a card with the cumulative figures for the quarter and a button that opens TapTax on the submit page, where you check and file.
“Is my tax code 1257L right on £38,000?”: Works without an account: the same checker as the website explains the code and any over- or underpayment.

Why filing stays in TapTax

Every quarterly update sent to HMRC carries fraud-prevention details about the device, browser and connection it was filed from. When you file in TapTax, those describe your phone or computer. A request relayed through an AI assistant’s servers could only describe the assistant’s servers, which HMRC would rightly reject.

So Claude does everything up to the last step: it gathers the figures, flags what still needs reviewing, and hands you a button that opens TapTax on the right period. You check the numbers and tap file. Nothing is ever sent to HMRC from a chat.

Every tool Claude can use

Anyone, no account needed

The free tools from this website. They never see anyone’s records.

estimate_self_employed_taxIncome tax, Class 4 NI and take-home from turnover and expenses
check_tax_codeWhether a PAYE tax code looks right, and what it means
check_mtd_statusWhether and when Making Tax Digital applies to someone
get_mtd_deadlinesThe quarterly update periods and deadlines for a tax year

Calculators: pay and employment

No account needed. The same calculators as taptax.co.uk/tax-calculator.

calculate_take_home_payTake-home pay from a salary, England or Scotland
calculate_gross_salary_for_take_homeThe salary needed for a take-home figure
calculate_salary_sacrificePension or electric car salary sacrifice savings
calculate_pro_rata_salaryA part-time salary and its take-home pay
convert_hourly_rate_to_salaryAn hourly rate as a yearly salary
convert_salary_to_hourly_rateA salary as gross and take-home pay per hour
calculate_student_loan_repaymentStudent loan repayments on Plans 1, 2, 4 and postgraduate
calculate_child_benefit_chargeThe High Income Child Benefit Charge
calculate_tax_on_multiple_incomesTax on salary, self-employment, rent, dividends and savings together
calculate_pension_tax_reliefTax relief on a higher pension contribution

Calculators: companies, contractors and the self-employed

No account needed.

calculate_dividend_taxTax on dividends
compare_salary_and_dividendsA director’s take-home from salary plus dividends
compare_limited_company_and_sole_traderLimited company against sole trader for the same profit
calculate_corporation_taxCorporation tax, with marginal relief
calculate_contractor_day_rateWhat a day rate earns, by route
compare_inside_and_outside_ir35Take-home inside and outside IR35
calculate_cis_deductionConstruction Industry Scheme deductions
plan_quarterly_tax_set_asideHow much to set aside each month for tax
calculate_mileage_allowanceThe business mileage allowance at the approved rates
estimate_self_assessment_penaltiesLate filing and late payment penalties and interest

Calculators: VAT, pricing and invoices

No account needed.

calculate_vatAdd VAT to a price or take it out
check_vat_registrationVAT registration threshold and the Flat Rate Scheme
check_vat_reverse_chargeWhether the construction VAT reverse charge applies
calculate_markupA selling price from a cost and markup
calculate_profit_marginProfit margin and markup from a cost and price
calculate_invoice_due_dateWhen an invoice is due on its payment terms
calculate_late_payment_interestStatutory interest and compensation on a late invoice

Calculators: property, gains and savings

No account needed.

calculate_capital_gains_taxCapital Gains Tax on property, shares and other assets
calculate_rental_income_taxIncome tax on rental profit for landlords
calculate_savings_interest_taxTax on savings interest
calculate_stamp_dutyStamp Duty in England and NI, LBTT in Scotland, LTT in Wales

Free documents

No account needed. Nothing you enter is stored.

prepare_business_documentAn invoice, quote, receipt, credit note or pro forma, ready to download
generate_invoice_numbersThe next invoice number, or a run of numbers in your format

Your records, read only

Needs you to connect your account, with “see your records” access.

get_tax_positionYour tax year so far, estimate, review count and filed quarters
list_transactionsSearch income and expenses, or list the review queue
get_mileage_summaryMiles, trips and the deductible amount for a year
list_invoicesInvoices with live status, outstanding and overdue totals
prepare_quarterly_updateThe cumulative figures for a quarter, with a button to check and file in TapTax

Changes to your records

Needs “add and change records” access. Claude asks before each change unless you allow it.

add_transactionRecord an income or expense
update_transactionMark business or personal, or correct a category, amount or date
log_mileage_tripAdd a business journey at the approved mileage rate (Pro)
create_invoiceCreate a draft invoice (free plans include 3)
send_invoiceShow an invoice with a Send button; it emails your client only when you press Send
mark_invoice_paidRecord that a client paid

Privacy and security

You sign in on taptax.co.uk, never in Claude. Claude receives a token that works only for TapTax’s connector, for the access you allowed, and TapTax stores only a fingerprint of it.
Access tokens last an hour and renew on their own; disconnecting ends them at once.
TapTax keeps a record of which tool ran, when and whether it worked, so you and we can see what a connection did. It does not record what was asked or answered.
Every tool is limited to your own records, and follows the same rules and plan limits as the TapTax app.

Read the privacy policy for the full detail, or email support@taptax.co.uk with any question about a connection.

Frequently asked questions

Can Claude file my return to HMRC?

No. Claude prepares your quarterly update and shows you the figures, and a button opens TapTax on the submit page for that period. You check the figures and file there. HMRC requires fraud-prevention details about the device and connection you file from, and a request relayed through an AI assistant cannot describe either honestly, so filing always happens in TapTax itself.

What can Claude see once I connect?

Only what a tool returns when Claude uses it: for example your income and expense totals, a list of transactions you searched for, or your invoices. It never sees your password, your bank logins, your HMRC sign-in or your National Insurance number. You choose read-only or read and change access when you connect.

Will Claude change things without asking?

Claude asks before it uses a tool that changes your records, and you can set each tool to always allow, needs approval or blocked in Claude’s connector settings. Sending an invoice goes further: Claude can only show you the invoice in a card, and nothing is emailed until you press Send on that card yourself.

Does it cost anything?

Connecting is free on every TapTax plan, and the 37 calculators and checkers work without an account. The tools follow your plan: mileage tracking is part of Pro, and the free plan includes three invoices. Claude itself needs a Claude plan that supports connectors.

How do I disconnect?

In TapTax, open Settings and choose Disconnect next to Claude under Connected apps. That ends the connection straight away. You can also remove TapTax from Claude’s connector settings.

Is my data used to train AI models?

TapTax does not use your records to train models, and it does not send them anywhere unless a connected assistant asks for them through a tool you allowed. What Claude does with a conversation is covered by Anthropic’s own terms and your Claude privacy settings.

Which apps can connect?

TapTax speaks the open Model Context Protocol, so Claude on the web, desktop and mobile, Claude Code, and other assistants that support remote MCP connectors with OAuth sign-in can all connect. The consent page always shows which website is asking before you allow anything.