I already started paying the higher rent: can I still challenge it or get it back?

You received a Section 13 rent increase, you felt you had no real choice, and you started paying the higher amount. Now, a few months in, a doubt has crept in. Was that increase even done properly? And having paid it, have you quietly signed away your right to do anything about it?

The short answer is that paying does not automatically lock you in. But whether you can still do something about it depends on two separate questions, and they often get muddled together. This walkthrough pulls them apart so you can see where you actually stand. It is written for private renters in England on an assured periodic tenancy.

Paying is not the same as agreeing

Start with the most common worry: that by paying the new rent, you have accepted it and it is now set in stone.

On a periodic tenancy, your rent only goes up lawfully in one of two ways. Either your landlord served a valid Section 13 notice, which since 1 May 2026 must be the current prescribed form, Form 4A, done correctly. Or you and your landlord freely agreed a new figure between you.

Paying an amount because you believed you had to is not the same as freely agreeing to it. If you never sat down and agreed a higher rent, and the only thing that happened is that a notice arrived and you paid it, then the question of whether the rent legally went up comes back to that notice. Did it actually work?

The two questions that decide everything

Here are the two things that matter, and the reason people get stuck is that they treat them as one.

Question one: was the notice ever valid? A Section 13 notice has to be done properly to have any effect. If it was defective, it never raised your rent, no matter how long you have been paying.

Question two: has the deadline to challenge the amount passed? Even a perfectly valid notice can propose a rent that is above the market. To argue that at the First-tier Tribunal, you have to apply before the date the new rent was due to start. Miss that date, and you usually lose the route to argue the figure.

These pull in different directions. You might be too late to argue the rent is too high, but still able to show the notice was invalid, which is a stronger position because it means the increase never counted at all.

If the notice was defective

This is where paying really does not lock you in.

A Section 13 notice can be invalid for all sorts of reasons: the wrong form, the wrong dates, the landlord's name or address missing, too short a notice period, or service that did not follow the tenancy agreement. If any of that applies, the legal position is simple. The rent did not go up. The old rent still applies, and the amounts you paid above it are overpayments.

Paying does not cure a defect. You cannot accidentally validate a broken notice just by handing over the money. So if you suspect the notice was wrong, that suspicion is worth checking carefully, because it may reopen the whole thing.

How reclaiming overpaid rent works

If the notice was invalid and you have been paying more than the old rent, you can ask for the difference back.

The usual sequence is straightforward. Write to your landlord, set out clearly why the notice was never valid, and ask for the overpaid amount to be returned. Attach your payment records. Many landlords, faced with a genuine defect, will sort it out rather than argue.

If they refuse, and the notice really was defective, the small claims track is the normal next step for recovering the money. Keep every bank statement, standing order record and receipt, because the claim stands on that evidence. Bear in mind there are time limits on reclaiming this kind of money, generally up to six years, so do not let it drift.

If you are still within the challenge window and the tenancy is live, there may also be routes to raise the figure directly, but the reclaim path above is the one that matters once the deadline for arguing the amount has gone.

The trap: did you actually agree?

There is one situation where paying can genuinely bind you, and it is worth being honest with yourself about it.

If you signed a new tenancy agreement at the higher rent, or you replied to the landlord to say the increase was fine, that can be a binding agreement in its own right, even without a valid Section 13 notice. In that case the rent went up because you agreed it, not because of the notice.

So the line to watch is the difference between agreeing to the increase and simply paying it under pressure. Paying quietly, because you were worried and did not know your options, is not the same as saying yes. If your situation is anywhere near this line, get advice before you assume past payments count as acceptance.

Keep paying the undisputed amount

Whatever you decide to do, do not stop paying rent while you work it out.

Withholding rent to make a point almost never helps. It builds arrears, and arrears give the landlord a possession ground under Section 8. Keep paying at least the old, undisputed figure, so nobody can say you are behind. You protect your home while you sort out the money.

And on that last point: since 1 May 2026, Section 21 no-fault eviction is abolished, so a landlord cannot simply evict you for questioning a past increase. That takes some of the fear out of raising it.

What to do next

If any of this is ringing true, the single most useful thing you can do is check whether the notice was valid, because that is the lever that survives even after you have paid.

A free grounds check looks at exactly that: whether the Section 13 notice was done properly, and whether the rent looks above market. It tells you which of the two questions above is your best route, so you are not guessing. Paying the increase was not a decision you can never undo. It just means the question shifts from stopping the increase to showing it was never owed.