What sources does Taxxa search?

Taxxa searches a continuously updated collection of more than one million pages from tax authorities, government publications, legislation and case law across the European jurisdictions it covers. Every response cites the underlying material, so a professional can inspect the rule, its jurisdiction and whether it is current before relying on the result.

Can Taxxa work with a team’s own documents?

Yes. Research can combine the public knowledge base with a team’s own PDF, DOCX, CSV and TXT files in one workspace. That makes it possible to compare a client document with the relevant guidance, trace a conclusion to its source and prepare a draft without losing the evidence that supports it.

Who is Taxxa built for?

Accountants, auditors, tax advisors, payroll specialists, bookkeepers and advisory teams working across European jurisdictions. Shared workspaces keep research available to colleagues, and citations make review easier.

Where is customer data stored, and is it used to train models?

Customer data stays in the European Union and is never used to train language models.

Does Taxxa replace professional judgement?

No. Taxxa is a research and drafting workspace. It helps professionals reach an informed starting point faster; the professional still reviews the evidence and makes the final decision. It does not file returns, post bookkeeping entries or give legal advice.

United KingdomGOV.UK

Wrong SDLT reference may divert payment to another tax bill

HMRC warns a mis-referenced SDLT payment may be allocated to a different tax bill owed, and payers can ask Stamp Duty Land Tax enquiries to move it.

By Taxxa AI OyPublished 24 September 2026

Tax

A Stamp Duty Land Tax payment sent with the wrong reference number may be delayedGOV, and it may be used to pay a different tax bill the payer owesGOV. A payment reminder follows. Where a payment has landed on the wrong bill, the payer can contact Stamp Duty Land Tax enquiries and ask for the payment to be movedGOV.

Every SDLT payment needs the 11-character unique transaction reference numberGOV: nine numbers followed by two characters, for example 123456789MCGOV. The reference appears on the paper return or on the electronic SDLT5 certificateGOV, and the payer must make sure the details entered match those held by the bank or card providerGOV.

HMRC expects a separate payment for each unique transaction referenceGOV. A payer who wants to cover many transactions with a single payment should send an online CHAPS enquiry form firstGOV. A cheque covering more than one reference should be accompanied by a list of all the references against each payment amount.

The return and any duty are due within 14 days of the effective transaction date. That is usually the completion dateGOV, but it can instead be the date the purchaser becomes entitled to take possession of the property, the date the first rent payment falls due, or the date of substantial completionGOV, when at least 90 percent of the payment or other exchange is made. Where the deadline falls on a weekend or bank holiday, the payment must reach HMRC by the end of the previous working dayGOV. Late payment can attract a penalty, interest, or bothGOV.

Payment can be made online by approving a payment through online or mobile banking, which is usually instant but can take up to two hours to show, or by debit or corporate credit cardGOV, with a non-refundable fee for corporate cards and no personal credit cards accepted. An online card payment counts as accepted on the day it is made, including weekends and bank holidays. Bank transfers go to the HMRC Shipley account: sort code 08 32 10GOV and account number 12001020GOV from a UK accountGOV, or the published IBAN and BIC from an overseas accountGOV, always in pound sterling. CHAPS and Faster Payments arrive the same or next working day, while Bacs needs three working days, so payers should check their bank's processing times and transaction limits. Cheques, payable to HM Revenue and Customs only with the reference on the backGOV GOV, go to the published addresses, with the payslip from the back of the return enclosed for paper filers.

The allocation, reallocation and payment mechanics above are those HMRC sets out in its Pay Stamp Duty Land Tax guidance.

Check the 11-character reference against the paper return or SDLT5 certificate before paying, and contact Stamp Duty Land Tax enquiries promptly if a payment lands on the wrong bill.

Sources

Pay Stamp Duty Land Tax