Deposit Protection Mistakes That Cost Landlords Thousands

Protecting a tenant's deposit is one of the oldest compliance rules in the private rented sector — it's been law since 2007. You'd think, nearly twenty years on, landlords would have it nailed. But deposit disputes remain one of the most common reasons tenants end up in county court against their landlord, and the penalties haven't got any softer.

Get it wrong, and a court must order you to repay the deposit in full — and can add a penalty of one to three times the deposit amount on top, at the judge's discretion. Local authorities can also issue civil penalties of up to £40,000 for serious or repeat non-compliance. And since the Renters' Rights Act came into force on 1 May 2026, a badly protected deposit carries a new practical sting: it can stop you serving a valid Section 8 notice, which is now your only route to possession.

The good news is that almost every deposit mistake is avoidable once you know where landlords typically go wrong. Here are the nine that come up again and again.

1. Missing the 30-day deadline

This is the classic. You have 30 days from the date you receive the deposit — not from the tenancy start date — to protect it in a government-approved scheme. If the deposit arrived before the tenancy began (for example, it was taken as part of a holding arrangement that converted into a full deposit), the clock starts from the date you actually received the money.

How to fix it: Protect the deposit the same week it lands in your account, not the same month. Set a reminder the day the funds clear, not the day the tenancy starts.

2. Forgetting the Prescribed Information

Protecting the deposit is only half the job. You also have to serve the tenant with Prescribed Information — details of which scheme you've used, how to apply for release of the deposit, and how disputes are resolved — within the same 30-day window. Landlords who protect the deposit on time but forget the Prescribed Information are still in breach.

How to fix it: Treat protection and Prescribed Information as one task, not two. Most schemes generate both at the same time if you complete the process properly, so don't stop halfway.

3. Using an out-of-date template

Each scheme — TDS, DPS, and mydeposits — has its own Prescribed Information template, and using an outdated or incorrect version can invalidate the service, even if you sent something. This one catches out landlords who've been doing this a while and are still using a document they saved years ago.

How to fix it: Always download the current template directly from your scheme's website when you protect a new deposit. Don't recycle an old file.

4. Missing a joint tenant or relevant person

If there's more than one tenant, every joint tenant must receive the Prescribed Information — not just the one who happens to pay the rent or deal with correspondence. The same applies to a "relevant person," such as a parent or guarantor who actually paid the deposit on the tenant's behalf. Missing even one person on a joint tenancy is enough to found a claim.

How to fix it: Keep a checklist for every tenancy that lists everyone who needs to receive the paperwork, and confirm each one individually — don't assume it's covered because you sent it to "the tenants" as a group.

5. Exceeding the five-week deposit cap

Since the Tenant Fees Act 2019, deposits are capped at five weeks' rent for most tenancies (six weeks if annual rent is over £50,000). The cap is still in force and hasn't changed under the Renters' Rights Act. To work it out: multiply your weekly rent by five, where weekly rent is (monthly rent × 12) ÷ 52.

How to fix it: Don't round monthly rent into a rough weekly figure — use the exact formula. If you're unsure, run the calculation before you invoice the deposit, not after.

6. Not re-protecting after a tenancy rolls over

This is one of the most common mistakes Circle Doors sees. Under the Renters' Rights Act, all assured shorthold tenancies converted to periodic tenancies, and fixed terms have gone entirely. Landlords who assume the original protection automatically carries on forever can come unstuck — particularly where a deposit was taken years ago under an old scheme membership that's since lapsed, or where the tenancy details on the scheme record no longer match reality.

How to fix it: Periodically audit every live tenancy — confirm the deposit is still protected, the scheme membership is active, and the amount registered matches what you actually hold.

7. Assuming late protection is a "complete" fix

If you've missed the 30-day window, protecting the deposit late is still better than not protecting it at all — but it isn't a full defence. Late protection can reduce the penalty a court applies, but the tenant can still bring a claim for the period the deposit sat unprotected, even after you've since put it right.

How to fix it: If you discover a deposit was protected late or not at all, don't just quietly fix it and hope. Get it protected and the Prescribed Information served immediately, and keep a clear record of what happened and when you corrected it — this matters if it's ever challenged.

8. Making deductions without evidence

At the end of a tenancy, deductions have to be justified — fair wear and tear doesn't count, and "the carpet looked worn" won't hold up in an adjudication. Landlords who don't have a proper check-in inventory, dated photos, and receipts for any repairs routinely lose deposit disputes, regardless of whether the damage was genuinely there.

How to fix it: A signed, dated inventory with photos at check-in and check-out is non-negotiable. Keep receipts for cleaning or repairs you're deducting for — the adjudicator will ask for them.

9. Missing the return deadline at the end of the tenancy

Once a tenancy ends and both parties agree the deposit amount to be returned, the deposit (or the agreed portion) needs to be repaid promptly — most schemes expect this within 10 days of agreement. Landlords who sit on the deposit while they "get round to it" risk a dispute even where the underlying deductions were fair.

How to fix it: Agree the final figure with the tenant in writing as soon as possible after check-out, and process the return without delay once you've agreed it.

The bottom line

None of these mistakes tend to come from bad intentions — they come from treating deposit protection as a one-off task rather than something that needs checking throughout the tenancy. With the Renters' Rights Act tightening the consequences of getting it wrong, now is the time to audit every deposit you're holding: is it protected, is the Prescribed Information served and up to date, does everyone who needs it have it, and does your paperwork actually back up any deductions you might need to make?

If you manage more than a handful of tenancies, keeping track of protection deadlines, scheme renewals, and Prescribed Information dates by memory is how these mistakes creep in. Circle Doors' compliance tools are built to keep exactly this kind of deadline visible before it becomes a court claim.

This guide reflects the law in England as of August 2026. It is for general information only and does not constitute legal advice. For complex situations, consult a qualified solicitor. Scotland, Wales and Northern Ireland have different tenancy deposit rules — always check local guidance before letting.