SDLT Record Retention: How Long to Keep Documents

The 6-Year Retention Period

Finance Act 2003 Schedule 10 paragraph 4 imposes a statutory obligation to preserve records relevant to an SDLT return for at least 6 years from the date on which the return was filed. This mirrors the approach taken under self-assessment income tax (TMA 1970 s12B) and ensures HMRC can verify the accuracy of the return during its standard enquiry window.

The 6-year period runs from the filing date, not from completion. In most cases, the SDLT1 is filed within 14 days of completion, so the 6-year period effectively starts from the date of purchase. For a completion on 1 March 2026, the minimum retention period expires on approximately 15 March 2032.

The SDLT5 certificate is the most important single record to keep, as it proves that SDLT was properly dealt with and is required for any future Land Registry dealings you may need to revisit.

What Documents to Keep

The statute requires records that are "relevant to the return" — in practice this means all documents that verify the transaction price, your buyer status, any reliefs claimed, and the fact that tax was paid or lawfully not paid. Your solicitor should provide a completion pack containing most of these.

HMRC Enquiry Windows

HMRC's power to enquire into an SDLT return is time-limited, but the limits differ significantly depending on the nature of any error. FA 2003 Sch 10 sets out three distinct windows that buyers should understand.

The 9-month window for standard enquiries runs from the date the return is filed. If the SDLT1 was filed on 15 March 2026, HMRC can open a standard enquiry until 15 December 2026. After that date, HMRC can only investigate if it discovers an underpayment through other means, with the extended time limits applying. Our guide to HMRC enquiries covers the process in detail.

Penalties for Inadequate Records

FA 2003 Sch 10 para 5 provides for a penalty of up to £3,000 for failure to keep adequate records. The penalty applies per transaction, so if you own multiple properties, each could theoretically attract a separate penalty if records are not maintained.

The penalty is imposed by HMRC following an enquiry in which adequate records cannot be produced. HMRC must show that relevant records were not kept — the mere fact that documents have been lost does not automatically attract the penalty if you can demonstrate that you took reasonable steps to retain them (for example, relying on solicitor copies that were subsequently destroyed in a fire).

More seriously, failure to keep records that would have revealed an underpayment can lead to HMRC raising a discovery assessment for the unpaid tax, plus interest and penalties for the underpayment itself — potentially far exceeding the £3,000 record-keeping penalty. If you believe you overpaid, records are equally important to support your repayment claim.

Complete Records Checklist

Use this checklist to ensure you have retained all necessary documents. Your solicitor's completion pack should contain most items.

Digital Record Keeping

HMRC accepts digital copies of SDLT records, provided they are legible and complete. This aligns with HMRC's broader Making Tax Digital (MTD) initiative and the general move to paperless record keeping. There is no requirement to retain paper originals unless the document itself is inherently original in nature (such as a wet-ink signed TR1 — though most are now executed in counterpart or digitally).

Cloud storage services (such as Google Drive, Dropbox, or iCloud) are acceptable for SDLT records, but ensure access controls prevent unauthorised access to personal financial information. Consider encrypting sensitive documents before uploading to cloud services.

Solicitor Record Retention

Solicitors are regulated by the Solicitors Regulation Authority (SRA) and must retain client matter files for a minimum of 6 years under the SRA Code of Conduct. In practice, most conveyancing firms retain files for 12–15 years, and some retain permanently for property-related matters.

However, you should not rely solely on your solicitor's records. Firms close, merge, or are wound up. Record-keeping practices vary. If you need to prove SDLT compliance 10 years after completion — for example, during an HMRC enquiry — obtaining records from a defunct firm may be impossible.

Extra Records for Relief Claims

If you claimed a relief when filing your SDLT1 return, the record-keeping obligation is significantly more demanding. SDLTM50600 makes clear that evidence of relief eligibility must be retained to allow HMRC to verify the claim. Given the 20-year enquiry window for deliberate errors, and HMRC's active programme of relief claim reviews, indefinite retention is strongly advised.

Our relief refund guide covers the evidence requirements for the most commonly claimed SDLT reliefs in detail.

Practical Storage Tips

Organising your property documents from the outset makes long-term compliance straightforward.

• Create a property file immediately: Set up a dedicated folder (physical or digital) for each property the moment completion occurs. Label it with the full address and completion date.
• Scan everything within a week of completion: Do not let paperwork sit in a drawer. Scan and file all documents within days of receiving your completion pack.
• Use the 3-2-1 backup rule: Keep 3 copies, on 2 different media, with 1 stored off-site (e.g., cloud backup).
• Note your destruction date: If you choose to destroy records after 6 years (and did not claim reliefs), mark the earliest destruction date in a diary or calendar reminder.
• Inform family members: If records are stored in physical form, ensure another family member knows their location in case you are unable to access them during an enquiry.

Frequently Asked Questions